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6C33B-C push pull with output transformer
6C33B-C push pull with output transformer
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Old 5th June 2009, 06:49 PM   #21
Alastair E is offline Alastair E  Wales
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Important with the big Russian '33 to Burn-In BEFORE attempting any matching....

To burn-in-

Run heaters Only for 24-48 hours.

heaters off, cool down for hour or so.

Then heaters On, only for half-hour.

Then arrange PSU of 60-80V etc, to pull 600mA with small neg on grid, to control current--monitor over first hour and trim G1 to maintain 600mA.

Leave for 2-3 hours drawing full current.--they get Bloody HOT!!-caution!

Kill B+ and then heaters, leave to cool completely and Then do your matching--BUT Remember, 6C33 Must be warmed up for around Half-hour with +B before taking any readings....

Time consuming process but pays out in life and less drift/stays matched issues....
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Old 27th December 2017, 04:58 PM   #22
Tyimo is offline Tyimo  Hungary
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Hi!
What about to use Garter bias?
Shoog you are an expert in it! Is it possible?

Greets:
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Old 27th December 2017, 07:12 PM   #23
goldenbeer is offline goldenbeer  Germany
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Garter bias with low mu triodes is no fun. Big time energy waster...
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Old 29th December 2017, 09:07 AM   #24
Tyimo is offline Tyimo  Hungary
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Old 3rd January 2018, 06:43 PM   #25
Lingwendil is offline Lingwendil  United States
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6C33B-C push pull with output transformer
Quote:
Originally Posted by goldenbeer View Post
Garter bias with low mu triodes is no fun. Big time energy waster...
I've done it and actually really, really like it. 165v supply, two 6AS7G in push-pull, and 330R cathode resistors each in a garter bias configuration. Works great, excellent balance, and sounds fantastic. Ignore the power consumption and excess heat. takes 33v or so each grid for full output, so 12AT7 or 6SL7 concertina works well, with headroom for negative feedback. This rig with 6SL7 up front is actually one of my favorite amplifier setups for low-moderate output uses, such as small bedroom rigs or similar. Efficiency be damned, as it sounds great and measures very respectably.

Only tricky part is getting 300~320v or so for the driver stage, which works fine with a dual ~115v secondary isolation transformer, just rectify each output and stack them on top of eachother. I've got a cheap isolation toroid that I simply added a set of 6 volt filament windings to, and it works great, and is cheap.
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