Dumont Oscilloscopes, Passaic NJ.. Allen Dumont is given credit to perfecting the basic cathode ray tube allowing it for use as a reliable display component. Dumont designed a gas thyratron tubes to produce a reliable and consistent trigger. From the late 1930's to around 1950 Dumont was the leader in oscilloscope design and manufacturing. Dumont went on to television and broadcasting.Dumont 240
LATE 1940'S and Dumont 164 (1937
) 3 inch display
Frequency time base, 1 Mhz frequency range
The World's First Dynamic Storage Oscilloscope
Before the digital storage, storing information was very complex and expensive. Tektronix came out with a way to store a waveform electronically and design a CRT to refresh the stored waveform so it can be seen. Although Hughes Aircraft first demonstrated storage CRT's it was Tektronix that could mass produce it and made it reliable and easy.
Tektronix 564 (1967)
World's First Production Storage Oscilloscope. Frequency Response 10 MHz. Based on 561 design- Hybrid circuitry and uses plug-in units for versatility
as a spectrum analyzer, cable tester, sampling scope, differential comparator etc
Below has 3L5 Spectrum Analyzer and 3B4 Time Base
Plug-ins for Spectrum Analyzer Applications
Inside a 564 Oscilloscope- Can you ID the tubes and transistors?
Shown with for normal oscilloscope mode of operation with 3A1 dual trace vertical plug-in and 3B3 time base generator
plug-in with delayed trigger.
Tektronix Portable Oscilloscopes, Beaverton OR. For many years Tektronix lead the way and set the standard. In 1961 the 321 was the first transistorized oscilloscope with true portability. In 1967 the 453 and 454 portable oscilloscopes were the fastest around and set the style of how a portable oscilloscope should be laid out.
Tektronix 321 (1961)
(First Transistorized Model) Actually a hybrid (used 7586 RCA Nuvistor tubes for the vertical input). Time base sweep, portable with rechargeable batteries or AC, 6 MHz frequency response Model on right is the earliest version.Tektronix 321A (1963)
Fully Transistorized used FET for vertical input
Typical View of 321's location for rechargeable batteries (Notice no cooling fan)Tektronix 453 (1966)
Dual Trace with delayed trigger. 50 MHz frequency response. Transistor model with two 7586 Nuvistor tubes for vertical inputs. Fully transistorized version model 453A came in 1968-69. Set the stage for future layout of portable oscilloscopes by other manufacturers. The military would make this one of their preferred models for equipment repair.
.Tektronix 454 (1967)
Same as 453 except has 150 MHz frequency bandwidth and X-Y Capability. The 454A is the all transistor version that came in 1968-69. Tektronix would be the leader in high performance portables until they would top this model with the model 475 ten years later
SCOPE CAMERAS Most used a Poloroid camera back connected to a camera lens with a hood to fit onto an oscilloscope CRT. Most used Poloroid 300 or 667 film (Still available through Fuji film)Tektronix C31
for 453 and 454 Oscilloscopes Tektronix C5
for Universal Use
1950s Typical Television Servicing Oscilloscope
Philco S8200 (formerly 7020 from 1952)
3" Diameter CRT with Frequency Base Trigger for Synchronization
MADE BY WATERMAN PRODUCTS