Germanium investigations

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S

Svjatoslav

Member
Joined 2010
devicemusic.ucoz.ru/forum/
VeightTripleDivision said:
Is 1T910AD quite the best choice for SE?
Click to expand...

It is possible. This transistor seems to be the latest development of high-power germanium high-frequency in the world.
But it is limited in the collector-emitter voltage.
There is also GT905 (1T905), metal body, or plastic.
60 V, 3 A, 6 W, frequency up to 60 MHz.
Attachments - measuring table, and diagram of the measuring stand.

??905, 1?905, gt905 ?????????? ????????????, ????????? ????????????, ?????????????? ????????????
 

Attachments

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  • 1Т905А_ ГТ905А_ГТ905Б_с3.jpg
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Z

Zoran

Member
Joined 2004
zorandimovski.com
Tubelab_com said:
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.



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.
Click to expand...

Hi I have the similar repared mono block amps from Westrex
Westrex 2404-C Germanium Amp Restored
I spot thwat the same heatsinks was used in mine...
That topology sounds pretty good (to me).
cheers
 
Z

Zoran

Member
Joined 2004
zorandimovski.com
jpatay said:
Complementary pairs ГT402, ГT404 fit well in the buffer to the output stage. But they need to be equipped with radiators. Circlotrons can use ГT321, ГT403, П605А, 1Т906.
Click to expand...

Can You sketch sch please?
Preferablu +,- rails.
I need buffer to drive input transformer (phase splitter) i my amp. (Small primary winding Lp, need smal generator Req...)
And maybe some AC komplements to use? I dont have ГT402, ГT404
It seems like AC187 AC188 maybe? Also I have AD161/AD162?
cheers
thanks
:)
 
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