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Old 21st August 2008, 04:42 AM   #1
DougL is offline DougL  United States
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Default 6AV5 PP amp Design Review

I have been playing with a 6AV5 design for a few months.

I was trying for inexpensive tubes, Iron and A2.

Comments are welcome. If you flame me, I'll send you my design document. Guaranteed to put the bravest of you to sleep. SY and Josh were gracious enough to read most of it.

Doug
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Old 21st August 2008, 04:45 AM   #2
DougL is offline DougL  United States
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Power Supply.
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Old 21st August 2008, 04:47 AM   #3
DougL is offline DougL  United States
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And the Bias Supply.
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Old 23rd August 2008, 04:28 AM   #4
DougL is offline DougL  United States
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Thanks to everyone who has looked at this.

Monday, I am going to start collecting parts.

I am hoping to use this as a test bed. I want to try stack the power supplies and direct couple, for example.

Doug
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Old 24th August 2008, 04:20 PM   #5
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Default Re: 6AV5 PP amp Design Review

Quote:
Originally posted by DougL
I have been playing with a 6AV5 design for a few months.

I was trying for inexpensive tubes, Iron and A2.
That design is heavily dependent on the quality of the various xfmrs. Inexpensive iron is going to sound like: Click the image to open in full size. Which would be good enough for a PA system or an AM modulator, where you either don't require any fidelity or where fidelity is undesireable and/or illegal.

If you want it to sound good for music reproduction, you'll need the good iron which is definitely not inexpensive.
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Old 25th August 2008, 05:42 AM   #6
DougL is offline DougL  United States
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Quote:
That design is heavily dependent on the quality of the various xfmrs.
I am aware that the transformer quality is the limiting factor in this design.

I was planning to use Edcor Iron.
Output XPP-15-8 -5K
Interstage XSM10K/10K or XSM15K/15K
Input WSM10K/10K or WSM15K/15K

The interstage the one I am most worried about.
I was thinking that a relatively low Z Input tube like the 6H6pi with its 2K Rp would Minimize transformer distortion and extend bandwidth.
I have several backup plans. The best is probably using a source follower ans Constant current loads.

The input transformer I may just have to specify better iron.
I am open to suggestions.

Are bandwidth, transformer distortion and ballance the three major issues with this as drawn?

Doug
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Old 11th October 2012, 06:12 PM   #7
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Did you ever build this amp? How well did it work? Did you use the Edcor transformers?
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