Anyone have schematics showing the circuit for a dual bias setup in a 2204 circuit? I've seen the layouts, but feel more comfortable working from the schematic. How many of you use dual bias circuits in your builds?
Thanks,
Rex
Dual Bias Schematics? - 2204 - JCM800
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cyclerj
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Billy Batz
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ficommm
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Re: Dual Bias Schematics? - 2204 - JCM800
Hello, can this be used on four EL34s, 100w amp?
Thanks,
Thanks,
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neikeel
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Re: Dual Bias Schematics? - 2204 - JCM800
Yes either as you see it there (so you would ideally need two 'pairs' of output tubes instead of a matched quad).ficommm wrote:Hello, can this be used on four EL34s, 100w amp?
Thanks,
Neil
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tfrost33
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Re: Dual Bias Schematics? - 2204 - JCM800
What is the purpose of this? does it affect tone?
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neikeel
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Re: Dual Bias Schematics? - 2204 - JCM800
Only in so much as you can buy pairs of NOS, or good used, output tubes more easily than you can buy matched quads and run them correctly biased in your 100watter. If you are buying new matched quads or have a big box of mullard EL34s to mix and match a set you need not bother 
Neil
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tfrost33
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Re: Dual Bias Schematics? - 2204 - JCM800
neikeel wrote:Only in so much as you can buy pairs of NOS, or good used, output tubes more easily than you can buy matched quads and run them correctly biased in your 100watter. If you are buying new matched quads or have a big box of mullard EL34s to mix and match a set you need not bother
Ahhhh, I see....
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kararsiz
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Re: Dual Bias Schematics? - 2204 - JCM800
Hi, I know this is an old thread and not very active recently but I've been trying to use this biasing without much luck. I haven't been able to get any results so far. If anyone has used it in any 50W equipment, can you please tell me what your potentiometer setting was? I'd be extremely grateful for any help.
prototype pcb assembly
prototype pcb assembly
Last edited by kararsiz on Wed Dec 11, 2019 11:49 am, edited 2 times in total.
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ivan H
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Re: Dual Bias Schematics? - 2204 - JCM800
Hi, I havent used a dual bias set up but know others do successfully. If u could be a little more descriptive about not getting results, eg are u not getting enough adjustment range or wotever, uno, & maybe a pic if possible, may make it easier for someone to help. Cheers