Author Topic: This Russian push pull tube amp output is really confusing me.  (Read 1753 times)

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Offline ELS122Topic starter

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This Russian push pull tube amp output is really confusing me.
« on: January 22, 2020, 06:26:17 pm »
I just can't even start to understand where the speaker connects, how it even works and it's just weird.
Also the 2 power transformers are just weird x 1000.
https://www.gstube.com/schemes/pics/Us/001.gif
 

Offline ELS122Topic starter

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Re: This Russian push pull tube amp output is really confusing me.
« Reply #1 on: January 22, 2020, 06:28:57 pm »
Like.. A choke from the ground. And supply for the preamp coming from the screen???
 

Offline glinjik

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Re: This Russian push pull tube amp output is really confusing me.
« Reply #2 on: January 22, 2020, 06:38:56 pm »
what i can tell you is the components are soviet era so diodes
д7ж =https://eandc.ru/catalog/detail.php?ID=5758

i don't know what part of the world your in but i suspect it would be v difficult to get those parts equivalent parts would need to be compared carefully of course here i can buy those parts easy :) I've given you a link to that diode maybe you use Google Translate or something?
All the truth in the world adds up to one big lie (Bob Dylan)
 

Online Gyro

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Re: This Russian push pull tube amp output is really confusing me.
« Reply #3 on: January 22, 2020, 06:43:56 pm »
It looks like output stage cathode feedback, but using an AC coupled centre tapped inductor rather than (the more usual) dedicated cathode windings on the output transformer. Look up the QUAD II 22 for an example of normal opt cathode feedback.
« Last Edit: January 22, 2020, 06:47:10 pm by Gyro »
Best Regards, Chris
 
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Offline hermitengineer

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Re: This Russian push pull tube amp output is really confusing me.
« Reply #4 on: January 22, 2020, 07:34:52 pm »
Hmmm... if you keep a screen at a lower potential than the cathode, could it become a parasitic draw rather than a control?  Because they seem to be expecting that, and using it as a feature.  I'm assuming that the speaker connects to the leftmost terminals?

Never mind.  The leftmost terminals must be the input, and the transformer labeled Amp1 must be where the speaker(s) connect.
« Last Edit: January 22, 2020, 07:40:01 pm by hermitengineer »
 

Offline Yansi

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Re: This Russian push pull tube amp output is really confusing me.
« Reply #5 on: January 22, 2020, 07:36:34 pm »
That is a "circlotron" amplifier topology.

See more for example here: http://circlotron.tripod.com/
 
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Offline Bud

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Re: This Russian push pull tube amp output is really confusing me.
« Reply #6 on: January 29, 2020, 03:09:13 am »
This is funny but I came across the complete article for this amplifier while googling for something else. A diagram on page 2 explains how to use a 4 Ohm or 16 Ohm speaker. The article is from a 1960 magazine.
Facebook-free life and Rigol-free shack.
 
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Offline Calvin

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Re: This Russian push pull tube amp output is really confusing me.
« Reply #7 on: January 29, 2020, 03:54:23 am »
Hi,

yes, its a circlotron.
The load is connected between the two cathodes of the output tubes.
As such the output impedance is lowish, allowing for transformer-less drive of a attached load, though it seems to be preferable to galvanically isolate the load with an output transformer.
Circlotrons also seem to cope quite well with electrostatic speakers as load.
Besides the requirement for two floating power supplies the driver stages need to be beefier than with conventional amplifier designs since they need to provide for the full voltage stroke.

regards
Calvin
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