Collins Radio TCS Transmitter and Receiver Set

Radio Transmitter USN Type No. 52245 and Radio Receiver USN Type No. 46159

Timeline of Collins Radio TCS radio sets

This page will have information in detail about the Collins Radio TCS transmitter/receiver sets. There is much information about these radios on the internet, some of it which have led to the demise and destruction of many of these radios. The TCS sets were quite popular as war surplus in the the late 1950's and 1960's and could be bought relatively cheaply. Some articles in popular HAM magazines advocated all sorts of hacks, with the result that many sets were "modified". This is a pity and it is now difficult to find complete and unmodified units.

The TCS units, in standard, unmodified form, needed no hacking. You could use the radios just as they were used during WW2. If you wanted a radio that had more power, or more gimmicks, or model railway engineering, you should have bought another radio, instead of messing up a TCS set. A typical hack was to replace the standard sockets with something else, even though the mating connectors were readily available (at a price), this always led to the destruction of the neatly done and highly skilled wiring and soldering of the wire loom to the original socket.

Then there were those who wanted higher modulation levels, so instead of finding a decent carbon microphone, or using an external microphone preamplifier, they would remove the input transformer, and then make a mess inside and call it a preamplifier. Or worse, they would remove the crystal deck, and build their version of a preamplifier which included a volume expander, compressor, 5 tubes, 101% modulation and some irrational obsession to get more talk power. Then some wanted 40 watts or more on AM, and so they wired both the two RF final stage (1625) tubes so that they can be modulated, instead of only one as per the original design, they would also increase the HT voltage to 600 volts. Yes, and now you wonder what happened. Then there were the modifiers that wanted to improve the appearance of the TCS sets. They added lights, holes, other RF connectors, knobs, and graffiti. So if you are the owner of a clean, original, unmodified TCS set, good for you, keep it that way.

The TCS sets were utilized in ships of all types, submarines, communication shelters, trucks, the jeep, field stations, and of course in many HAM shacks after WW2. Collins Radio of Cedar Rapids, Iowa, USA designed the TCS sets and the external add-ons, such as the different AC and DC power supplies, remote control box and antenna loading coil. Other contractors beside Collins Radio also constructed TCS sets. They may have had a hand in some of the modifications and circuit changes that occurred during the period of construction of these radios. The US Naval Research Laboratory (NRL) did have an influence on the circuit of the transmitter as well. They found that the RF ammeter when connected in the ground lead may under certain conditions of operation show an incorrect indication of proper loading. The later models (in the case of the Hamilton TCS13 contract, from serial no. 1387) had the RF ammeter connected in the high potential of the output circuit, i.e. between the rotary inductor and series/parallel capacitor and the RF output connector. Many sets were modified consequently to follow the NRL directive.

The TCS radios were designed in 1940, and constructed up to probably mid to late 1945; there was no post-war contract for the manufacturing of TCS sets. The last contract (N5sr 10539, dated July 25, 1945) that I know of, was given to Air King Products. Whether they were still completing the contract after WW2 is a possibility, but one with a low probability as the war in Europe had already ended (8 May 1945), and Allied governments were cancelling or shrinking the size of contracts all over the world. There was no reason to continue manufacture of TCS sets after WW2 ended on 2 September 1945. If you know of a later contract, please let me know. Amazingly TCS sets were used by the US Navy and other services into the late 1950's, and even into the 1960's but often more as a stand-by radio unit by that stage. During WW2, TCS sets were spread all over the world, Russia received many, England and other British Commonwealth countries (since 1949 the Commonwealth of Nations), at least Australia, South Africa, India and possibly others as well.

I always use an LM or BC221 type heterodyne frequency meter with the TCS set. Although the radios are quite stable, it is very convenient to use the frequency meter and this easily keeps you within the band plans of the HAM bands. By using a heterodyne frequency meter you can set the operating frequency of both the transmitter and receiver very accurately, whether you are on VFO mode (and can then net the transmitter and receiver) or crystal mode (no netting possible), want to work split frequency, split band, or monitor your favourite broadcast or clandestine frequency, the LM or BC221 combined with the TCS stability makes it simple. No mods, no fuss, no hacks. That is why there are LM and BC221 frequency meters. The VFO is resettable with reasonable accuracy if you use the markings on the skirt of the VFO tuning knob.

These TCS sets had a precursor, which influenced its design, this is not acknowledged or mentioned in the literature, so here it is; the TCS series was influenced by the Collins Model TCH/18M-5 transmitter-receiver units. The TCS sets also influenced its successor, of which there were only a few built, the AN/URC-8 transmitter and receiver sets (although as Nick England (K4NYW) mentioned to me, the TCS influenced the AN/URC-8 development only functionally). According to the URC-8 brochure "It is an improved, modern and more versatile version of the widely accepted Collins built TCS equipment". Below are the two radio sets, I will point out some similarities and differences, unfortunately the image quality is not that great, so please use your imagination a bit. I use the vertical stacked arrangement of the TCS to make the comparison easier. The TCH is built into one enclosure, but internally the receiver and transmitter is basically separate. The TCS is a split transmitter/receiver unit, but was designed and built to operate as a pair.

The Collins Radio in-house model numbers for the TCS sets were 51Q-x for the receiver and 56Q-x for the transmitter. According to Dennis Starks, who has some of the blueprints, some of the in-house numbers are:

Collins,1945,56Q-3 transmitter

Collins,1943,56Q-3/18Q-3,transmitter

Collins,1945,51Q-3,Receiver

Collins,1943,190Z-2,Antenna Loading Coil

Collins,1944,409M-7,Power Supply

Earlier receiver models, say made late 1940 or early 1941, may be numbered 51Q or 51Q-1. It would be great to figure out the time-line of the small changes from model to model, however information on this is very limited. If you have such a receiver or transmitter, these are not pre-TCS models, they are standard TCS models, but early production. The US Navy contract models all had TCS-XX as model number, but clearly Collins Radio had other customers in mind as well, at least in the initial stages of manufacturing.

Collins Radio TCH/18M-5

The TCH set
Separate VFO (tx and rx) and crystal control (2) (tx and rx)
Transmitter: Frequency dial knob and frequency dial arrangement as well as window style, very similar to the TCS. The VFO knob can be locked. Located at same place as TCS (upper right hand corner). The VFO has a Hartley oscillator circuit.
Receiver: Frequency dial knob and frequency dial arrangement as well as the frequency display window has a style very similar to the TCS. The VFO knob can be locked. Located at same place as TCS (bottom right hand corner). The VFO has a Hartley oscillator circuit.
The position of the antenna connector is at the top left of the receiver section. This connector is shared between transmit/receive, the transmit/receive relay is located in the transmitter section.
Both receiver and transmitter band switches are located on the centre line of both transmitter and receiver sections, at the bottom of each section. There are three positions for the different bands (2 - 4, 4 - 8, 8 -16 Mc/s).
The TCH transmitter tune-up knobs are located below each other, in a vertical line, on the left of the top (tx section), from top to bottom; PLATE TUNING, PLATE INDUCTANCE, FINE OUTPUT TUNING and COARSE OUTPUT TUNING. There are four controls.
On the left hand side of the TCH, there are five control knobs in a vertical line.

TCH receiver tube line-up:

RF amplifier 12SK7, one input tuned circuit for each band, resonance adjusted with one section of 3-section variable capacitor.
Mixer-Oscillator 12SA7, mixer section has one input tuned circuit for each band, resonance adjusted with one section of 3-section variable capacitor. Oscillator section has one tuned circuit for each band, resonance adjusted with one section of 3-section variable capacitor.
First IF amplifier 12SK7. No second IF amplifier
Detector-BFO-1st audio stage 12SQ7.
Audio output stage 6G6G.

If you compare the TCH and TCS receivers, clearly the TCH is just the smaller brother...no arguments!

TCH transmitter tube line-up:

VFO and crystal oscillator 6V6G. VR-150-30 regulates screen and anode voltages of the 6V6G. VFO doubles on all bands.
Final RF stage 807.
Modulator two 6V6G's in class B. Two tubes modulate one RF final tube (V3). Modulator has a transformer input, driven by carbon microphone. No preamplifier.

The TCH output stage is a standard pi-network, with the provision to switch in additional capacitance on the loading side, it has variable capacitors on both the tank resonating side (dip) and the loading side. The pi-network coil is tapped at ten points. An external loading coil was available (190U-1). Dipoles, end fed antennas or rod antennas can be matched with this circuit.

So, the TCH transmitter circuit is basically a very efficient circuit, two tubes for RF, which includes VFO and xtal control from 2 to 12 Mc/s. The modulator is very efficient, only two tubes, for near 100% modulation with a five watt carrier.

Collins Radio TCS

The TCS set
Separate VFO (tx and rx) and crystal control (4) (tx and rx)
Transmitter: Frequency dial knob and frequency dial arrangement as well as window style, very similar to the TCH. The VFO knob can be locked. Located at same place as TCH (upper right hand corner). The VFO has a Hartley oscillator circuit.
Receiver: Frequency dial knob and frequency dial arrangement as well as the frequency display window has a style very similar to the TCH. The VFO knob can be locked. Located at same place as TCH (bottom right hand corner). The VFO has Hartley oscillator circuit.
The position of the receiver antenna connector is at the top left of the receiver section. This is a separate receiver antenna connection, linked to the transmitter which contains the transmit/receive relay.
The transmitter band switch is located on the centre line, but at the middle of the unit. There are three positions (1.5 - 3, 3 - 6, 6 -12 Mc/s). The receiver band switch is off-centre to the left bottom, located to the right of the RF gain control.
The TCS transmitter tune-up knobs are located below each other, in a vertical line, on the left of transmitter unit, from top to bottom; COUPLING, PLATE TUNING, ANT CON (50 pF capacitor in series, off, parallel with antenna). There are three controls.
On the left hand side of the TCS pair stacked vertically, there are five control knobs in a vertical line.

TCS receiver tube line-up:

RF amplifier 12SK7, one input tuned circuit for each band, resonance adjusted with one section of 3-section variable capacitor.
Mixer 12SA7, mixer section has one input tuned circuit for each band, resonance adjusted with one section of 3-section variable capacitor.
Oscillator 12A6, has one tuned circuit for each band, resonance adjusted with one section of 3-section variable capacitor.
First IF amplifier 12SK7.
Second IF amplifier 12SK7.
Detector-BFO-1st audio stage 12SQ7.
Audio output stage 12A6.

TCS transmitter tube line-up:

Master (VFO) oscillator 12A6. Doubles on Band 3.
Crystal oscillator 12A6.
Buffer-doubler 12A6. Doubles on Band 2 and Band 3.
Final RF stage two 1625's (basically 12 volt 807).
Modulator two 1625's in class B. Two tubes modulate one RF final tube (V104). Modulator has a transformer input, driven by carbon microphone. No preamplifier.

The TCS output stage is a parallel tuned LC circuit, loading is done with a variometer coupling, antenna matching is made easy with a series coupled rotary inductor. In addition a 50 pF capacitor can be switched in series, off, or parallel with antenna). An external loading coil was available for the lower frequencies (190Z-2) (Navy Type COL47205, if Collins was the contractor). This arrangement worked well with whips and rod antennas.

This circuit is only slightly more complicated than that of the TCH. The additional 12A6 as a separate crystal oscillator is more for redundancy than a circuit necessity. The buffer was required to provide adequate drive and oscillator isolation. The TCS is more stable than the TCH.

BUREAU OF SHIPS

The Department of the Navy, Bureau of Ships (BuShips) was formed by combining the Bureau of Construction and Repair (BuC&R) and the Bureau of Engineering (BuEng). It was established by Congress on 20 June 1940 and abolished by the US Department of Defense on 9 March 1966; its successor was the Naval Ship Systems Command (NAVSHIPS), which, since 1974, is known as the Naval Sea Systems Command or NAVSEA.

Bureau of Ships (BuShips) planning council, as at August, 1945. From left to right,

Commodore J.B. Down, U.S.N. (Electronics), Captain P.G. Lauman, U.S.N. (Fiscal), Rear Admiral J.J. Broshek, U.S.N. (Maintenance), Rear Admiral C.L. Brand, U.S.N. (Shipbuilding), Captain E.E. Roth, U.S.N. (Administration), Rear Admiral S.S. Kennedy, U.S.N. (Shore), Rear Admiral F.J. Wille, U.S.N. (Contracts), Rear Admiral E.W. Mills, U.S.N. (Asst. Chief), Vice Admiral E.L. Cochrane, U.S.N. (Chief of Bureau)

USN-BuShips structure.jpg

As can be seen from the organizational structure diagramme dated 15 August 1940, the Bureau of Ships was responsible for many things during WW2, such as the design, construction and maintenance of ships; maintenance and management of shipyards, docks, shore stations and all the things to do with procurement of equipment required on ships. BuShips was also responsible for procuring electronics for ships, so were intimately involved with the evaluation, acceptance tests and maintenance as well as the procurement of the TCS radios for its ships, boats and other installations as required. This would have resorted under the Radio Branch, which was a branch within the Design Division.

USN-BuShips1942.jpg

As electronics within the USN was such an important component, the Radio Branch became a division on its own in late 1942. The Radio Division experienced rapid growth due to the pressures of war, and BuShips naval and civilian personnel involved in electronic work (including research on radar) increased from only 39 in January 1940 to 1205 in September 1945. This growth brought reorganization, and the structure of BuShips can be seen in the organizational structure diagramme dated 23 October 1942, signed by Rear Admiral A.H. Van Keuren, USN, the Chief of the Bureau of Ships. Procurement and production was a branch within the Radio Division.

USN-BuShips1945.jpg

By the end of WW2, the structure of BuShips had changed once more to reflect organizational realities, which included down-scaling of many activities and personnel. The name of the Radio Division was changed to the Electronics Division; this division was involved in much more than radio by that stage as can be seen from the organizational diagrammes. After the war had ended in Europe, Vice Admiral E.L. Cochrane, Chief of the Bureau of Ships approved this overview of the organizational structure of BuShips, dated 15 June 1945. It is a pity it is only a skeleton version, as a detailed version would have shown which sections had been cut, merged or changed.

US Navy contract nomenclature

The USN had a well defined nomenclature for its contracts that was used by the different bureaus within the navy.

The contract number prefixes used by BuShips are listed below, the periods of use are tentative as I have not found any official description yet, if you find a TCS equipment name plate where the contract date falls outside these periods, please send me the details.

NOs - (prewar to March, 1942).
NXs - (March, 1942 to December, 1942), only used if the Bureau of Supplies & Accounts purchased something for itself.
NXsx - (November, 1942 to April, 1945).

TCS-5 to TCS-11 seems to be covered by NXsx. This contract prefix was in use since 1943. TCS-5 to TCS-11 was purchased by the Bureau of Supplies & Accounts for BuShips using NXss, the rest of the TCS were procured under NXsr and N5sr. The NXsx prefix covers the longest wartime period of the contract prefixes and is assembled as:

N = Navy Department.
X = Placeholder for last digit of the year the contract number would reset to 1.
s = USN Bureau of Supplies & Accounts.
x = Placeholder for use when the Bureau of Supplies & Accounts issued a contract for another bureau (such as for the Bureau of Ships).

From January 1943, i.e. from the TCS-12 contract dates, the Bureau of Supplies & Accounts made procurements for other USN Bureaus. I am not quite sure of the dates/periods of prefix use yet. These are identified as follows:

NXsy = Bureau of Yards and Docks; (January, 1943 to April, 1945).
NXss = Bureau of Ships (BuShips); (November, 1942 to August, 1943?).
NXsr = Bureau of Ships (BuShips); (September, 1942? to March, 1945?).
NXso = Bureau of Ordnance (BuOrd); (January, 1943 to April, 1945).

The Bureau of Supplies & Accounts used the following prefix (see TCS15 prefix) when contract numbers restarted in April of 1945:

N5sx = Bureau of Supplies & Accounts - (April, 1945 to June 1947 (last date of use I could find)).
So the contracts for the TCS-15 (N5sr) are dated from April 1945, where the r in the x placeholder indicates BuShips. It would seem that contracts for BuShips used both r and s as a bureau identifier. It is likely that the r represented the Radio Division of BuShips. The Radio Division was established in October 1942. So the r in the x placeholder should have been used since round about that date. The earliest use of the r that I could find was September 1942, and the latest March 1945. By June 1945 Buships had been reorganized again, and the Radio Division had been changed into the Electronics Division to more accurately reflect the multifaceted nature of the division, radio being only a component of its business. It would seem that at that point in time, the BuShips contract number structure switched to N5sr.

A very comprehensive overview of the administration of the USN in World War II can be accessed at http://www.ibiblio.org/hyperwar/USN/Admin-Hist/USN-Admin/. These BuShips organizational structure images I have used are borrowed from this site.

Figure 1. Russian manual of the TCS 11 radio set.

Figure 2. Pages 72 and 73 of the Russian TCS 11 manual. The table contains typical transmitter operating voltages and currents and is basically a copy of the table as found in the different versions of the English instruction books.

Timeline of Collins Radio TCS radio sets

Here I will attempt to document the timeline of the TCS sets. This is not easy and will very clearly have to be updated as more information is gathered. There is much confusing and erroneous information floating about on the internet. So, if you have some information, from a reliable source, concerning the manufacture, distribution, contracts, manufacturers, circuit changes, etc. please forward this to me so that we can develop a more complete and more accurate picture of the timeline. I will use details taken of transmitter and receiver name plates, as well as from manuals.

Information on the internet claims that the early contracts, TCS, TCS-1, TCS-2, TCS-3, mostly went to Russia. These claims do not quite add up in my head. If you have any information about these contracts, please forward it to me.

Germany invaded Russia on 22 June 1941 (Operation Barbarossa), before that the Russians were not part of the Allied forces. They were pillaging Europe with the Germans. The US Lend-Lease Act was only passed in March 1941, and the first beneficiary was the British Empire, not Russia. Russia only became eligible for lend-lease aid on November 7, 1941.

The first lend-lease protocol with the USSR (Moscow protocol) covered the period October 1, 1941 to June 30, 1942. No radio equipment is listed in this protocol, only field telephones, aeroplanes, tanks etc.

The second protocol, (Washington protocol) which covered the period July 1, 1942 to June 30, 1943 includes radios.

Item 20. - Radio sets of Various Types. Amount requested: 12,000 units. 11,500 radio sets of various types. Specific types are to be negotiated and to be made available at the following rates:

100 in July

1,100 in August and September

2,350 in October

2,475 in November

1,225 in December

535 each month from January to June 1943.

The third protocol, (London protocol) covers the period July 1, 1943 to June 30, 1944. It also included radio equipment, SCR-299, SCR-284, Wireless set no. 19, (total received during WW2 12780), Pilot V-100, SCR-177B, SCR-274, SCR-511, SCR-610 (total received during WW2 2800), and undelivered under the second protocol, it included 20 Hallicrafters receivers, 10 RME-43 receivers, 200 Bendix transmitters, 2A-12B, 200 Bendix receivers.

The fourth protocol (Ottawa protocol), covers the period July 1, 1944 to June 30, 1945. It also included radio equipment. I only list 1 kW and under here. The USSR was offered 12,100 units.

1000 SCR-399; 4,000 SCR-284; 3,300 SCR-274N; 200 SCR-177B; 3600 Pilot V-100B; Receivers: 400 RCA DR-89; 1200 National HRO; 500 Federal 128-A; 500 SP210-X or SCR244.

You will notice that the TCS does not appear in the third or fourth protocols. So, the conclusion is that if any TCS sets went to Russia under a lend-lease protocol, they must have been sent under the second protocol, (Washington protocol) which covered the period July 1, 1942 to June 30, 1943. So, if the TCS, TCS-1, TCS-2 and TCS-3 sets were sent to Russia, during the second protocol, the USN must have stacked these in a large room, for a year and 6 months, waiting for Russia to be invaded. Now that does not make sense, you must agree. In addition, when checking the list of equipment that was actually sent, I find no TCS sets. So, the only TCS sets that Russia could have received, were theater transfers and non-protocol shipments. What about spares? If Russia received hundreds or thousands of TCS sets, they should have been given spares? Out of the lend-lease program, they received more than two million radio tubes, of which 500 were 12SK7's, 300 were 12A6's and 400 were 1625's. So, no 12SQ7 or 12SA7. The main radios used by the USSR during WW2, as provided by the lend-lease programme were the British Wireless Set no. 19, and the SCR610 (battery operated FM transmitter-receiver; frequency range 27 to 38.9 Mc/s).

Therefore, the questions are where did the TCS, TCS-1, TCS-2 and TCS-3 go, and did Russia have any TCS sets? I don't have the answer to the first question except to say they did not go to Russia. For the second question, the answer is yes, the Russians used TCS sets during WW2. But only those given to them during transfers within theaters of war, non-protocol transfers and transfers where TCS sets were built into the equipment being transferred, e.g. ships and torpedo boats. After they were invaded by the Germans, i.e. after June 1941. I have a TCS-2 receiver, serial no. 69, so being located in South Africa, this TCS-2 must have fallen under a lend-lease programme to the British Commonwealth. South Africa left the Commonwealth in 1961.

Non-protocol transfers

Between October 1, 1941 and April 30, 1942, $593,565 worth of radio tubes and equipment was sent to Russia. Did these shipments include TCS sets? Why should they... the TCS contracts were specifically for the USN, and the TCS sets would have been ordered for a specific purpose, and that was to equip USN ships and boats.

Russian TCS manual

So, was there a Russian TCS manual? There were basically two. One for the TCS-5 (two versions) and one for the TCS-11 (see Figure 1 and Figure 2).

Описание и инструкция к приемо-передатчику типа TCS-5 [1945. - 104 с.; 16 см.]

Description and instructions for TCS-5 type transceiver [1945. - 104 p.; 16 cm]

Описание и инструкция к приемо-передатчику типа TCS-5 [1945. - 103 с.; 17 см.]

Description and instructions for TCS-5 type transceiver [1945. - 103 p.; 17 cm]

Описание и инструкция к радиостанции типа TCS-11 [1946. - 155 с.; 16 см.

Description and instructions for the TCS-11 type radio [1946. - 155 p.; 16 cm.]

These were USSR Navy publications.

These were not translated versions of a standard manual. As these Russian manuals refer to the TCS 5 and 11, it is certain that some TCS 5 and 11 sets were sent to Russia. These were operations booklets with no pictures or diagrammes. Quite a number of wooden torpedo boats (30 were originally scheduled to be delivered by November 1943) were sent to Russia under the lend-lease programme, it can be supposed that these were all equipped with TCS sets.

As at 1 February 1944, between July 1942 and January 1944, 47 wooden torpedo boats were delivered, with a further 11, 10 and 4 scheduled for delivery February, March and April 1944 respectively. Another 9 was to be delivered at an unscheduled date, this would make a total of 81 torpedo boats sent to Russia under a non-protocol lend-lease programme. By February 1944, the first TCS-14 contract had already been issued (Sept 23, 1943). So, one can assume that many if not all of these torpedo boats were equipped with TCS-4 to TCS-14 sets.

Contracts with the US Navy: (Navy Department - Bureau of Ships) (not complete at this stage). For an explanation of the contract number nomenclature see the section on US Navy contract nomenclature.

It is very likely that the first (TCS to TCS-3) contracts were quite small, as the USA was not part of the Allied forces yet; it is assumed that production of the TCS sets commenced late 1940, so it is likely that the first four contracts were issued late 1940 and during the first quarter of 1941, and were specifically for USN requirements (not for lend-lease or other war assistance). The US declared war on Japan on the 8th of December 1941 and declared war on Germany the 11th of December 1941, by then the TCS-4 contract was already in place.

TCS, contract NOs-
TCS-1, contract NOs-
TCS-2, contract LL-NOs-95008, Dec 4, 1941. Contractor Collins Radio Company, Type Col-46159, serial 69. (Receiver name plate). This particular TCS-2 has the normal grab handles and not the corner posts, it also has the standard name plate. Information taken from a receiver in my possession.
TCS-3, contract NOs-
TCS-4, Collins Radio Company, contract NOs-84440, April 16, 1941, Type COL-52245, serial 470. (Transmitter name plate). Transmitter serial 1223 has a USN acceptance date of Feb 12, 1943.
TCS-5, Collins Radio Company, Contract LL-Nxss-0142, (COL-21881 Dynamotor assembly (12v))
TCS-5, Collins Radio Company, contract NXss-LL-8142, (LL-NXss-8142), November 6, 1942, (Magnavox manufactured some of the remote controls as well as Collins). Magnavox manufactured antenna loading coil units.
TCS-6, Manufactured by Air King Products Co., Inc. contractor Hazeltine Electronics Corp., contract NXss-16730, Type CKP-46159-A, serial 1146. (Receiver name plate), from the nameplate of a transmitter; Type CKP-52245-A, Manufactured by Air King Products Co., Inc. contractor Hazeltine Electronics Corp., contract NXss-16730. Cinaudagraph Speakers Incorporated manufactured remote control units for the TCS-6; from an RCU nameplate Type CCY-23270-A, Manufactured by Cinaudagraph Speakers Incorporated, contractor Hazeltine Electronics Corp., contract NXss-16730 (in my possession). From a TCS-6 transmitter (serial 1450) in my possession, contract NXss-16730 was accepted by the US Navy on Feb 10 1944. This transmitter was also Manufactured by Air King Products Co., Inc. with the contractor being Hazeltine Electronics Corp.
TCS-7, Manufactured by Steward Warner Corporation, contractor Collins Radio Company, contract NXss-18851, Type CWS-46159, serial 673. (Receiver name plate)
TCS-8, Stewart Warner Corporation, contract NXss-18844, Type CWS-46159, serial 2805. (Receiver name plate) From TCS crystal; CRJ-7234, contract NXss-18844.
TCS-9, Collins Radio Company, contract NXSS-22666.
TCS-10, Collins Radio Company, contract NXss-LL-29815, Type COL-46159, serial 517 (Receiver name plate), Type COL-52245, serial 517 (Transmitter name plate). Both transmitter and receiver built by Collins Radio, not by a sub-contractor. (In my possession).
TCS-11, Collins Radio Company, contract NXss-33361. The Russian TCS manual refers to the TCS-11, so it is reasonable to conclude that a substantial number of TCS-11 sets went to Russia during WW2.
TCS-12, Collins Radio Company, contract NXsr-46026, Type COL-46159, serial 11205 (Receiver name plate), Type COL-52245, serial 11205 (Transmitter name plate). Both transmitter and receiver built by Collins Radio, not by a sub-contractor.
TCS-12, Collins Radio Company, contract NXsr-36727, (Nxsr-LL-36727) 6 September 1943, Type CMX-46159, serial 7956 (Receiver name plate), Type COL-52245, serial 7956 (Transmitter name plate). Transmitter built by Collins Radio, receiver built by sub-contractor The Magnavox Company, Collins Radio being the contractor.
TCS-12, Collins Radio Company, contract NXsr-47395, 18 January 1944, Type COL-46159, serial 17288 (Receiver name plate), Type COL-52245, serial 17288 (Transmitter name plate). Both transmitter and receiver built by Collins Radio, not by a sub-contractor. Sheridan Electro Corporation manufactured antenna loading coil units (Type CAQO-47205).
TCS-13, Hamilton Radio Corporation, contract NXsr-38307, Sept 22, 1943, Type CIH-52245-A, Serial 1149 (Transmitter name plate). Accepted by USN, June 23, 1944.
TCS-13, Hamilton Radio Corporation, contract NXsr-48389, contract date? Type CIH-52245-A, accepted by USN Feb 20, 1945. Serial 2074 (Transmitter name plate).
TCS-14, Air King Products Co., Inc., contract NXsr-38314, Sept 23, 1943. Type CKP 46159-A, serial 1440 (Receiver name plate) (Meissner Manufacturing Company manufactured antenna loading coil units, Type CML-47205)
TCS-14, Air King Products Co., Inc., contract NXsr-48390, Feb 14, 1944, (Cinaudagraph Speakers Incorporated manufactured remote control units, Meissner Manufacturing Company manufactured antenna loading coil units, Type CML-47205)
TCS-14 Air King Products Co., Inc., contract NXsr-86279, Dec 18, 1944
TCS-15 Air King Products Co., Inc., contract NXsr-91960, Mar 01, 1945
TCS-15 Air King Products Co., Inc., contract N5sr-8595, June 27, 1945
TCS-15, Air King Products Co., Inc., contract N5sr-10539, July 25, 1945
TCS - ?? From TCS cystal, CMW 10482, contract NXss-27167 (In my possession).
TCS - ?? From TCS cystal, CMW 7406, contract NXsr-35038 (In my possession).

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