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EL84 Amp - Baby Huey
EL84 Amp - Baby Huey
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Old 2nd February 2018, 02:06 PM   #1921
ckwong99 is offline ckwong99  Hong Kong
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Thx Bandol it is optional unless the amp osillation ?
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Old 2nd February 2018, 03:15 PM   #1922
bandol83 is offline bandol83  France
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@mctavish

I prefer option 2, more classical for tube amplifier, but for all of the 3 options I would have put the capacitors in the back between the power transformer !

Marc
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Old 2nd February 2018, 03:26 PM   #1923
bandol83 is offline bandol83  France
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@ ckwong99

Yes because the Baby Huey amplifier use a special shunt feedback architecture with R13, which in combinaison of the feedback of the UL taps on the output tubes screen grid will be enough to get a stable amplifier without global feedback ! In fact this is an advantage of this amplifier because many Audiophiles didn't like global feedback

However if you build a pentode output version with the screen grid connected to a fixed regulated power supply, you may need to add the global feedback...

Marc
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Old 2nd February 2018, 05:06 PM   #1924
mctavish is offline mctavish  Austria
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As they are film caps I was trying to keep them as close as possible to the board to reduce inductance in the leads (and thus defeat the purpose of a large film cap connected directly to the C.T. of the output transformer).

I am still working on the layout.... no metal chips yet...
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Old 9th February 2018, 03:30 AM   #1925
e_fortier is offline e_fortier  Canada
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EL84 Amp - Baby Huey
Very interesting thread, subscribed
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