Bang & Olufsen
Bang & Olufsen is Denmark's famous manufacturer of high fidelity equipment.
B&O was founded in 1925 by Peter Bang and Svend Olufsen and has manufactured everything within beautifully designed audio equipment such as amplifiers, gramophones, tape recorders and CD players etc..
B&O Dirigent
One of the first slim radio designs from the Danish factory. The slim B&O Dirigent from 1963 with a 609K FM tuner contains a stereo single-end amplifier output and a front panel for controlling a TV set. The visionary engineering design from B&O implemented the TV set control in the
Dirigent stereo radio. The TV set control seems to be one of the first of its kind
The single-end B&O Dirigent sounds wonderful
A beautifully designed radio with a cabinet that partly consists of a rosewood wooden frame on top of a metal chassis
Even with the compact and slim design, the radio is quite service friendly. Note the famous JS Jorgen Schou single-end audio output transformers.
B&O 610 export tubeamplifier
Another milestone was the stereo amplifier 610 from around 1963, where for the first time you could visually read the treble and bass levels on the front panel of the amplifier. Mechanically activated. B&O 610 beautiful in this Riopalisander wooden case. Again with Jørgen Schou transformers and 4 x ECL85 Philips or Telefunken as output tubes.
As for export with black faceplate... for sale in DK with blue faceplate.
All necessary capacitors replaced in both hybrid driver boards
B&O 610 with adjusted bias after 15 min.
Necessary components replaced after 57 years. Good sound from B&O 610 that deserves the best sensitive speakers
Beomaster 4000
The Beomaster 4000 is a 2 x 60 Watt radio with a pair of complementary TO3 darlingtons in both channels. The Beomaster 4000 (BM4000) is a beautifully designed radio that Bang & Olufsen and designer Jacob Jensen offered for sale in 1975. In 1978, B&O was able to deliver the Beovox S75 speakers, which in my opinion fit the BM4000 very well. The BM4000 is the direct successor to the Beomaster 3000-2. The Beomaster 3000-2 from 1969 is on display together with the Beomaster 1200 and the tangential record player Beogram 4000 plus others at The Museum of Modern Art
All capacitors in the power supply section have been changed from Wicon to Nippon Chemicon, because the Japanese capacitors are of high standard, but also because they are what is in stock. Normally you don't need to disassemble the entire amplifier board, but as a retiree you have time to carry out repairs more carefully. The mechanical construction of the BM 4000 is good despite the flat design.
As can be seen on the driver board, all film and other electrolytic capacitors have been replaced. It was not necessary to replace all capacitors, but since the driver board was freely accessible, all important components were replaced...including some transistors and trimpots.
