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what's a good layout for a quad EL84 amp on this box?
what's a good layout for a quad EL84 amp on this box?
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Old 18th July 2010, 01:43 AM   #1
freddi is offline freddi  United States
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what's a good layout for a quad EL84 amp on this box?
Default what's a good layout for a quad EL84 amp on this box?

chassis - 10"x23"x3" - how would you layout the power tubes and their drivers? will cathode biasing in the scheme below handle most EL84/6bq5 including Russian equivalents?

schematic - anyone got a better drawn schematic which will work for quad-EL84SE and 1640SE xformer?
EL84 Quad SE

Antek & Hammond iron
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Old 18th July 2010, 02:02 AM   #2
kenpeter is offline kenpeter  United States
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I dunno, but get you JJ-EL84 matched quads if you ain't already.
But if you get em from PE, don't order NOTHIN heavy to go with.
Even though I order pillow stuffing, the tubes is loose in bottom
with a bag of heavy T-Nutz and other loose parts nowhere near
the acoustastuff... Still, nothing broken tubewise.

Real happy with JJ. Working great in Fisher X100A-3 push pull.
Voltage is likely very high for EL84, as sockets called for 7189.

Follow Moray advice on placement? Don't follow PE advice, you
can see where they put'm. Sovtek 7591 not packed any better...
Corners, and edges. Ain't that where it surely gets dropped?

Also what Fisher done is probably "right" also. Big weight evenly
balanced at opposite corners makes good sense when you lift it.
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Last edited by kenpeter; 18th July 2010 at 02:22 AM.
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Old 18th July 2010, 03:14 AM   #3
kenpeter is offline kenpeter  United States
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How bout this? Isolazy I draw in LTSpice like it waz Visio er'sumthin.
Don't ask me where the exponential slot goes...
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Last edited by kenpeter; 18th July 2010 at 03:19 AM.
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Old 18th July 2010, 04:03 AM   #4
freddi is offline freddi  United States
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what's a good layout for a quad EL84 amp on this box?
wow - that is cool - thanks
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