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Old 11th November 2019, 04:18 PM   #11
rsumperl is offline rsumperl  United States
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20LF6s
Good Monday everyone,
Would it be better to go with a lower plate voltage, let's say around ~450v and go with a 2500 Ω or 3300 Ω transformer? Looking at the data sheet, it appears the 6LF6/20LF6 can do some high current.

Thanks
Ray
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Old 11th November 2019, 04:44 PM   #12
kodabmx is offline kodabmx  Canada
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20LF6s
As I said, I use similar tubes triode connected. 120mA idle, 320V plate. Screen ties to place through 220R. 1k3 transformer. Push Pull. I haven't built an SE amp. If going pentode, I'd try about 250V... Are you planing PP or SE?

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Old 11th November 2019, 06:11 PM   #13
rsumperl is offline rsumperl  United States
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My intention is Push-Pull, goal is power to spare, and relatively clean power.
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Old 11th November 2019, 06:27 PM   #14
kodabmx is offline kodabmx  Canada
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I get over 80W out of mine as triodes. As pentodes if you use a low enough Z (Like a Hammond 1650T or two toroidal transformers interleved) you should get lots.

Triodes are more linear, but the drive requirements are higher (like 200Vp-p).

My calculations show that you can even get about 80W out of a trioded pair at 250V if you use a 600R output transformer.
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Old 13th November 2019, 01:52 AM   #15
Tubelab_com is offline Tubelab_com  United States
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Want my opinion? Take the stuff you have, the 500 volt supply, the 150 volt supply, the 20LF6's, and your 4K OPT, and put together a breadboard prototype of at least one channel. If your 4K OPT has multiple speaker taps, then you can run an 8 ohm load / speaker from the 16 ohm tap to put a 2 K load on the tubes. Even with 4 K you will be near 100 Watts, and the tubes will last forever.

You can also figure out what works good before you commit to a final design.
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