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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: 11 Sep 2020, 09:38 
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I've got a pair of 15w SE 5K output transformers, a power supply that puts out about 310 v at around 170mA, several 6V6GT, a couple 6SL7 a bunch of 6N1P, and an assortment of resistors and capacitors. I also have a bunch of 6L6GC and 6550 tubes

What single ended amp would you build? I'd prefer to work with what I have but am not against spending a few bucks if a different driver tube or something like that would make a big improvement.


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PostPosted: 11 Sep 2020, 12:10 
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Location: US Pacific Northwest
As for the power stage, I would use the one from the Marblewood amp. This power stage has been checked out with not only 6V6s, but 6L6s, 6W6s, and 6F6s. This would provide some versatility in reconfiguration. Of course, this assumes that your output transformers have a UL tap.

As for the driver, you could use the 6SL7 with an unbiased cathode bias (to limit gain). I would recommend the same with the 6N1P as it's ยต of 35 would likely need to be tamed as well.

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PostPosted: 11 Sep 2020, 12:54 
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I'd been looking at the lacewood amp on your site but, for some reason, hadn't looked at the marblewood.

The transformers do have the UL tap.

It also has the one thing I didn't mention that I prefer less complicated designs. And even better there are good photos of the layout of the underside.

I currently have a power supply setup that is putting out a pretty smooth 312v so I should be able to just add the amp stage to it.

What new production 12AU7 would you recommend?

thanks!


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PostPosted: 11 Sep 2020, 14:29 
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invaderzim wrote:
What new production 12AU7 would you recommend?
I always start with JJ. I think they are the best value in the new production signal tubes. and I've never had an issue with a JJ signal tube. The Tung-Sol reissues aren't bad either. I tend to stay away from Electro-Harmonix these days. I keep getting noisy tubes from them.

However, NOS and used 12AU7s are so plentiful I'd recommend experimentation. I must have about 20 different branded 12AU7 tubes in various conditions. And none of them were expensive.

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PostPosted: 12 Sep 2020, 15:34 
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Hi, I would go for the JJs as well. I would probably start with the 6L6s. They will deliver a nice level of output and generally sound decent.

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Bruce

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