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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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It is currently 17 Nov 2019, 02:56

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PostPosted: 10 Oct 2019, 07:37 
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Joined: 13 Jan 2018, 21:33
Posts: 221
Location: australia
“While I had Qians amp I increased the snubbing around the filement rectifiers. Though the hum from the amp was only low I thought it worth while to see if I could reduce it more. I put 0.01uf polys between all legs of the rec. bridges. Qian tried serveral times to find a hum and could not. “

@mwhouston, Hi Mark. I still have (just) audible noise I suspect from the heater circuitry. Above do you mean you placed the caps across the + and - of the bridge rectifier? Are there any other sites you have snubbed that you found necessary?

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PostPosted: 08 Nov 2019, 15:25 
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Joined: 26 Jan 2011, 08:57
Posts: 49
May I ask the board about the 300B schematic?
I see it is one channel.
How do I tie the second channel to the first?
Thank you.


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PostPosted: 08 Nov 2019, 18:55 
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Joined: 06 Apr 2009, 10:08
Posts: 1594
Location: US Pacific Northwest
Both channels are shown in the schematic in this post: http://diyaudioprojects.com/Forum/viewtopic.php?f=9&t=2699&start=131

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It's all about the Glass!
http://www.CascadeTubes.com
Cascade Tubes Blog


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PostPosted: 08 Nov 2019, 19:05 
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Joined: 26 Jan 2011, 08:57
Posts: 49
Thank you very much.


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