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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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PostPosted: 21 Dec 2019, 21:48 
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Joined: 17 Jul 2019, 21:09
Posts: 2
Hello! Using the 6w6 in pp is a good choise? I search but i cant find any circuit with 6w6 in pp


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PostPosted: 21 Dec 2019, 21:50 
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Joined: 17 Jul 2019, 21:09
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All i have is this. But i dont know what about the power supply voltages.


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PostPosted: 22 Dec 2019, 20:47 
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Joined: 06 Apr 2009, 10:08
Posts: 1698
Location: US Pacific Northwest
The 6W6 works really well in SE mode in the Marblewood Amp (more information here: https://www.cascadetubes.com/the-6v6-marblewood-amp/).

Concerning the schematic you posted, the voltages are based on the transformer used (300-0-300) at load. My guess would be a B+ around 350vdc at load. The screens are held lower by the 3kΩ dropping resistor. Personally, I'd run the tubes in UL mode with a higher bias voltage (i.e. larger self bias resistor). In my opinion UL mode always beats pentode mode. YMMV

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PostPosted: 05 Jan 2020, 00:54 
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Joined: 06 Nov 2017, 19:18
Posts: 7
Here's some:
6w6 -Flea Amp Audio Circle
https://www.audiocircle.com/index.php?topic=153569.0

https://www.ietlabs.com/pdf/Manuals/GR/ ... lifier.pdf

Amplifier Uses Cheap Output Transformers (Stancor A 3830, universal weighs 1.8 lb )
6W6= 50L6, 35L6 25L6, 12L6 dif heaters
https://www.americanradiohistory.com/Ar ... 55-Aug.pdf

Admiral 5N3 6W6 PP from Pacific Tube
http://pacifictv.ca/schematics/admiralt1048data.pdf

p56 An Economy Audio Amplifier 35L6 PP
https://www.americanradiohistory.com/Ar ... 2-11-R.pdf

I've got Stancor A-3830 in this amp Quality Amplifier for TV p 44
https://www.americanradiohistory.com/Ar ... 951-05.pdf


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PostPosted: 05 Jan 2020, 14:14 
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Joined: 06 Nov 2017, 19:18
Posts: 7
also, 6W6 = 6GC5, 6DB5, 12DB5 (dif heater)

a 12DB5 amp onYoutube
https://www.youtube.com/watch?v=NveQewztliw


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