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Old 23rd May 2020, 05:22 PM   #51
woofertester is offline woofertester  United States
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Quote:
Originally Posted by Soundhappy View Post
Thanks Woofertester

Are your 2SB206 metal case a little rusty ?
It's + half of century old Ge
Imagine build F6 style or differential topology amplifier with psu large V/A toroid and capacitors..
Yes small amount of rust on both devices. I would be interested to know what topology Mr. Pass is planning for this device.
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Old 23rd May 2020, 06:11 PM   #52
Nelson Pass is offline Nelson Pass  United States
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Germanium investigations
Me too. The parts have yet to make a suggestion.

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Old 23rd May 2020, 06:21 PM   #53
Zen Mod is offline Zen Mod  Serbia
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Germanium investigations
they already whispered to Mighty Moi

now Mighty Moi need to whisper to Time

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Old 23rd May 2020, 06:53 PM   #54
Soundhappy is offline Soundhappy  France
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Plenty of germanium datasheet's made for audio: small signal and power stages
motorola :: dataBooks :: 1966 Motorola Semiconductor Handbook 2ed Aug66 : Free Download, Borrow, and Streaming : Internet Archive
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Old 24th May 2020, 02:50 PM   #55
Soundhappy is offline Soundhappy  France
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Texas Instruments was another important company who produced germanium transistors in the 60's
ti :: Texas Instruments Electronics Series :: Walston Transistor Circuit Design 1963 : Free Download, Borrow, and Streaming : Internet Archive
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Old 24th May 2020, 03:26 PM   #56
Tubelab_com is offline Tubelab_com  United States
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Many know that my exploits with vacuum tubes date back to a pre-teen kid in the 60's that got tubes, transformers and other parts from the trash to make guitar and HiFi amps. I also got discarded car radios from a local auto junkyard. If it didn't work, they tossed it. The radios from the late 50's usually had 4 or 5 tubes that ran directly from the 12 volt car battery and one big fat (TO-36) germanium transistor on the back driving an output transformer in a class A SE design. There were several different kinds. The number 2N174 comes to mind, but there was a silver colored Delco branded part that was the hardest to blow up.

Quote:
that used a class B solution vaguely similar to the one in the RCA data sheet with drive transformer/phase splitter and output coupling capacitor.
The common transistor used in the germanium totem pole circuit was the 2N2147. It was in everything from Heathkit stereos to Acoustic guitar amps. The circuit design comes from the RCA transistor manual.

I wound my own driver transformers and used the circuit for everything from 10 watt guitar amps with car radio transistors to a monster amp that put out over 1 KW from 24 X 2N3773's.

I found one of my old amps with 6 X "2n3055's" when I was moving out of Florida. I built it in high school (1969) which explains my crude construction skills. It made 200 to 300 watts into a 4 ohm load on a B+ of about 100 volts. The measurements were made with a Simpson 260 and a scope, hence the large uncertainty factor.
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Old 24th May 2020, 03:37 PM   #57
Soundhappy is offline Soundhappy  France
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Germanium DUT circuit ( small signal )
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