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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 18 Mar 2019, 09:37

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PostPosted: 11 Mar 2019, 17:43 

Joined: 23 Feb 2017, 02:02
Posts: 361
This suggest that the 1k feedback makes the effective impedance accross 680ohms smaller and could be cutting off earier than 2.3hz ... lator.aspx

If you make the 100uF bypass to 220uF or 330uF that could solve the plorbem but is only a guess.

PostPosted: 12 Mar 2019, 08:57 
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Joined: 04 Jun 2008, 20:59
Posts: 3932
Location: Arizona, USA
Hi, Unless you have really unusual speakers the NHB is sort of optional. All of these amps I have measured respond flat to about 8 HZ with it in place. Since it is there to stop potential resonance issues that could possibly occur in the range of 75KHZ with peculiar loads you can leave it disconnected. In the bigger amps I routinely (and in the kits) include a NFB defeat switch. Some folks like the sound better. You can increase the cap if you want. My data indicates that 100uf is more than adequate for flat response belows 20HZ . Try increasing it. If you like the result, great, that is what DIY is all about.

Good listening

Some of my DIY Tube Amplifier Projects:

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