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Old 12th June 2012, 07:57 PM   #1
diyAudio Member
Join Date: Jan 2005
Location: Denmark
Question Schematic to a friend

Hello Friends

I've made a schematic for a friend, and now I want the specialists to comment on the schematic before we start the soldering iron.

Thank you in advance

You must not look at the pin numbers on the schematic. They do not fit.



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File Type: pdf 6BG6 SE.pdf (15.0 KB, 127 views)

Last edited by Hojvaelde; 13th June 2012 at 01:39 AM. Reason: Oversight.
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Old 12th June 2012, 08:16 PM   #2
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Join Date: May 2011
Location: Little Rock
Be sure to bypass V5's g2 (screen) to ground or cathode. Looks good. Pentode output stages can often benefit from a Zobel across the speaker output terminals - cheap 'n cheerful.

All good fortune,
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Old 13th June 2012, 08:13 AM   #3
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Just make sure that G2 current is always enough to keep the 39V Zener in the linear range. Maybe you need a lower wattage Zener.
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Old 13th June 2012, 07:58 PM   #4
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Join Date: Aug 2004
Location: Cambridge, England.
Note that these are my opinions and other people may disagree:

I'd do the NFB differently - run a 47uF capacitor from the 6BG6 anode through a 47K resistor into the top of R2, delete R3 and C1.

You may need to tweak values slightly to taste and gain.
I'm assuming this is a power amp - if integrated I'd add another triode at the front end like an ECC88.

Use a follower for D3 too if possible.
No idea about the PSU - didn't look at that.
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