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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 23 Aug 2017, 14:26

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PostPosted: 28 Jun 2017, 05:00 
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Joined: 13 May 2016, 02:02
Posts: 57
Location: Javea, Spain
What are you using for your power supply? What is your audio source? Put up some photos?


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PostPosted: 08 Aug 2017, 06:40 
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Joined: 18 Apr 2013, 00:18
Posts: 5
Hi everybody,

I have a PSU that delivers both 16V and 33V, So i figured I can build this amp using two lm317s to bring the 16V down to 12.6V for the heaters, and maybe use about 30V for B+.

Is this feasible at all? Or is it a bad idea? My reckoning is that the sound will be more "tuby" at 30V B+.

I know I'll definitely have to use heatsinks for the 317 and 510, and I plan to use 100k pots for the bias voltage. As far as I can tell from the datasheets, the lm317 and irf510 can operate at 30V.

However, I'm not sure about the other components. Should I use 2W resistors instead of 1/4W? And will I need to adjust the grid bias resistor? I tried to figure out how to calculate the grid bias resistor, but I don't really understand how to do it.

Do any other resistor or capacitors need to be changed?


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PostPosted: 10 Aug 2017, 20:33 
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Joined: 28 May 2008, 21:53
Posts: 4488
Location: Winnipeg, CANADA
Hi hbekel, yes, you can do that and it works well, I've tried it out with 24V B+. The LM317 can put out 37V regulated. The limits are noted in the datasheet.

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PostPosted: 12 Aug 2017, 15:20 
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Joined: 18 Apr 2013, 00:18
Posts: 5
Hi Gio,

Thanks, that sounds reassuring. I will just try it and report back :)


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