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Old 24th April 2004, 10:24 AM   #1
hacknet is offline hacknet  Singapore
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Default Whats a Good 6L6 circuit?

i`ve been think about building a tube power amp lately, i`ve decided on a 6L6 since i`m looking for punch bass and nice mids (for me to further apreciate dire straits and eddie van halen)

i`ve seen alot of circuits for the 6L6 but most of them being designed for guitar use.

whats a good circuit you guys recommend? i`m hoping for about 20watts.

Thanks in advance
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Old 24th April 2004, 11:41 AM   #2
SY is offline SY  United States
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Williamson.
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Old 24th April 2004, 01:56 PM   #3
hacknet is offline hacknet  Singapore
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any other?

how much can i hope to get out of a pair of 6L6 i push pull?
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Old 24th April 2004, 02:11 PM   #4
hacknet is offline hacknet  Singapore
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i looked around for williamson amps and found them to use only 6550 or EL34s. are you refering to the other acrosound amps?
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Old 24th April 2004, 03:46 PM   #5
SY is offline SY  United States
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Quote:
Originally posted by hacknet
any other?

how much can i hope to get out of a pair of 6L6 i push pull?
Depends on the output configuration. I don't have my RCA tube manual at hand, but I think you could get 40-50W in pentode. If someone else doesn't chime in with the number, I'll find it sometime today.

A Williamson with 6L6s and a 6600 ohm plate-plate output transformer would make a very nice 18 watt triode amp.
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Old 24th April 2004, 03:51 PM   #6
hacknet is offline hacknet  Singapore
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hmm.. looks good.


i`m new to building tube amps and i`m going to ask a silly question.

can i add a triode to UL switch since i really haven`t made up my mind which i prefer?
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Old 24th April 2004, 03:56 PM   #7
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Default UL-triode switch

You can, but think VERY carefully about insulation requirements in the event of switch failure and the stray reactances in wiring it up. I'd recommend doing it as a hardwired option, moving a wire or a jumper on a terminal strip. You can't do a rapid A-B test, but you can still change it over in a few minutes and you avoid a lot of complication.

If you're new to the tube thing (and even if you're not!), do think about safety when probing around an amp that's been switched on in the recent past- capacitors can hold a lethal charge for hours after the unit is switched off.
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Old 24th April 2004, 04:02 PM   #8
hacknet is offline hacknet  Singapore
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yup, i`ve gotten a good kick from charged caps from building previous tube gear.


btw, i cant seem to find the circuit you are talking about. PLease PLease Please point me there....

Thank You!
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Old 24th April 2004, 04:09 PM   #9
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Quote:
Originally posted by hacknet
Any other?
Yup. Use another Williamson for the other channel.
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Old 24th April 2004, 04:10 PM   #10
SY is offline SY  United States
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The original Williamson circuit was published in Wireless World. Quite a few variations were published in Audio Engineering and Audio- several are available reprinted in the Audio Anthology series. I haven't seen Morgan Jones's book yet, but I'll bet it's in there, too.
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