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Old 14th November 2012, 06:34 PM   #51
Jaap is online now Jaap  Netherlands
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Originally Posted by DF96 View Post
He asked for rectifier subs?
simply try what you have and see what it brings (after you have checked the specs)
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Old 18th November 2012, 07:14 AM   #52
pancaQe is offline pancaQe  United States
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I've decided to go with this design. Any suggestions on improvements?
Click the image to open in full size.[/IMG]
Click the image to open in full size.

Last edited by pancaQe; 18th November 2012 at 07:17 AM. Reason: insert image
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Old 18th November 2012, 06:39 PM   #53
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Don't see an image?

jeff
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Old 18th November 2012, 06:43 PM   #54
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Loose the 80mfd cap after the rectifier and go with a reasonable sized cap for one.
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Old 18th November 2012, 08:08 PM   #55
pancaQe is offline pancaQe  United States
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Yea I can't seem to figure out if I can post an image that's on my computer, or does it have to be a URL.
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Old 18th November 2012, 08:15 PM   #56
pancaQe is offline pancaQe  United States
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I figured I'd look at the site FAQ to see about posting images, low and behold there it was so here it is.
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File Type: gif 6V6-6sn7 Amp.gif (52.9 KB, 66 views)
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Old 18th November 2012, 10:22 PM   #57
kevinkr is offline kevinkr  United States
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This is essentially the Williamson circuit which has way more gain than required for use with the 6V6 even with pretty significant levels of global feedback applied. It also frequently exhibits LF instability that is almost impossible to eliminate if you do not have profound understanding of loop stability criteria and the equipment required to measure the open loop phase shift and gain.. (Think Bode plot here)

A variation of the Mullard 5-20 circuit with a high mu triode like the 6SL7 in the front end might be a better (sounding) choice. Gain while still high may be made more in keeping with modern sources like CD players and DACs..
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Old 18th November 2012, 10:33 PM   #58
pancaQe is offline pancaQe  United States
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Thanks kevinkr. I never thought it would be so difficult choosing a good design using the tubes I have available. I'll check out the Mullard 5-20.
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Old 18th November 2012, 10:38 PM   #59
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Originally Posted by pancaQe View Post
I've decided to go with this design.
Why?

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Originally Posted by pancaQe View Post
Any suggestions on improvements?
Needlessly complex with a mediocre power supply. You're building a "mono" amp right, not a pair of mono-blocks for stereo? I like the schem. I posted earlier way better, I'd just change the PS a little.

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Old 18th November 2012, 11:06 PM   #60
pancaQe is offline pancaQe  United States
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vinylkid, Actually this will be a pair of mono-blocks. I could tell the ps was weak and was looking into beefier alternatives. I like the schem you showed earlier, but was put off by the filter chokes. I'm trying to build this with parts on hand. Kind of a garage junk build with a sound of gold . And it doesn't look complex, compared to a couple other designs I've built it actually looked fairly simple.
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