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Old 6th October 2009, 04:55 PM   #11
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The 3K2 load would probably rule out cathode self-bias...

I think I'd prefer 6K6 for this. 3K2 would be nice for 4x in parallel P-P but a big
waste of power and too much stress on the tubes at large output

Michael
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Old 6th October 2009, 05:14 PM   #12
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Isn´t there a 4ohm tap? In that case, connect your 8ohm speaker to that.
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Old 20th October 2009, 08:08 AM   #13
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I just want to inform about the answers I got in another forum on this issue. In fact, I (and most of the people on this forum) was totally wrong about the use of OT's in guitar amps. As the thread shows, this amps are built to run in A/B or B and that changes the math somewhat. Very interesting experience after designing Hi-Fi amps for too long

Oh, and by the way, the cross over distortion is an important part of the classic rock sound in Marshal amps

B+ voltage vs impedance in EL34/50W - Marshall Amp Forum

Last edited by SwedishWings; 20th October 2009 at 08:11 AM.
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Old 20th October 2009, 03:42 PM   #14
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Quote:
Originally Posted by SwedishWings View Post
I just want to inform about the answers I got in another forum on this issue. In fact, I (and most of the people on this forum) was totally wrong about the use of OT's in guitar amps. As the thread shows, this amps are built to run in A/B or B and that changes the math somewhat. Very interesting experience after designing Hi-Fi amps for too long

Oh, and by the way, the cross over distortion is an important part of the classic rock sound in Marshal amps

B+ voltage vs impedance in EL34/50W - Marshall Amp Forum
Very interesting. What's your screen voltage? That changes the plate curves and probably explains why 3k2 works

Michael
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