The Germanium-only circlotrons. Powerful, wideband.

[Svjatoslav]

I report for almost a year's work. Labor is collective.
Series of amplifiers Cyclothers of different configurations. In order to fully utilize the elemental base of germanium semiconductors.
The power band was able to extend from 30-50 to 600 kHz.
Power up to 36 watts. Maybe more.
Amplifiers are very stable.
Stable resting current. Stable output voltage, zero.
Two of the four diodes (VD1-4) are temperature sensors. Placed on radiators
Meander at 100 kHz.

 

[Svjatoslav]

The biggest curiosity is the Cyclotron with a single transistor on the output.

 

[adason]

The biggest curiosity is the Cyclotron with a single transistor on the output.

Sounds like one hand clapping...

 

[adason]

Nice work btw...

 

[Svjatoslav]

Sounds like one hand clapping...

The best sound option is currently.
Feature of germanium transistors - increase of gain with increasing current.
On the graph, the dependence of the "beta" indicator on current. For 1T910AD
This also applies to other transistors of the circuit.

 

[Yurik_V]

The previous version of the scheme, more simple. 1kHz, 10kHz, 20kHz.
Sinus: 0dB - 70kHz, -3db - 180kHz.

 

[latala]

Well i know the next project I have been looking for something like this for years !
Do you think i will work well with silicon output devices ? I would like to know the standing current I assume this is a class A device
Regards Trev

 

[N101N]

Very nice. I like the Circlotron-C best and would make it even simpler by omitting T5 and T7.


@latala
I would certainly try this topology with some modifications.

 

[latala]

i think you mean to eliminate the cascode transistors on top of t5 t7
Thinking about it now
Trev

 

[P.Lacombe]

Very nice job ! With MosFet transistors the result should be interesting too, since there is no gain drop at high intensity, and the frequency response is very wide.

 

[Yurik_V]

I listened to this amplifier with silicone 3055. With germanium, the sound is different. Not better or worse, just different.
standing current 400mA (min 200mA)

 

[N101N]

No, Trev. I mean to make it a pure grounded-base amplifier.

 

[N101N]

Very nice job ! With MosFet transistors the result should be interesting too, since there is no gain drop at high intensity, and the frequency response is very wide.

Yes, with lateral MOSFET.
Suggestion:
JFET-bipolar cascode input, grounded-base driver, lateral MOSFET output.

 

[N101N]

Trev, maybe not what you were taught in school? However, the VAS buffer and the cascoded VAS (British iventions) have no physical foundation, but are based on incorrect assumptions and some mathematical gibberish.

 

[jpatay]

I soldered variant D3. Frequency respouse: 17 Hz - 260 kHz (-3 dB). Current - 250 mA. Meander at 100 kHz.
http://devicemusic.ucoz.ru/_fr/2/s0060778.jpg

 

[latala]

do you have the schematic that u used with 2n3055 i would like to see that
i would build it it even though it has so many power supplies

 

[jpatay]

I tried to put of darlington TIP147, everything was OK.
clipping sine wave - TIP147:
http://devicemusic.ucoz.ru/_fr/2/s5586742.jpg
Current - 200 mA.

 

[latala]

yes nice and clean clipping show me the circuit please
trev

 

[jpatay]

do you have the schematic that u used with 2n3055 i would like to see that
i would build it it even though it has so many power supplies

Svjatoslav has a circuit of Sziklai.

 

[Svjatoslav]

Scheme with outgoing cascade Sziklai.