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Hoffman Amps Forum image Author Topic: SE cathode cap for 6l6  (Read 2902 times)

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Offline Tone Junkie

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SE cathode cap for 6l6
« on: September 05, 2016, 01:44:55 am »
Whats a good cathode bypass resister and cap combo for 6l6 at 365 to 370 volts B+ . Im making a champ for the neighbor kid.
Ive done everything but SE style amps. I seem to be on a help the young guitar players around me kick. LOL
 Ive collected so many parts over the years. I figured I might as well put them to good use.
Bill

Offline sluckey

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Re: SE cathode cap for 6l6
« Reply #1 on: September 05, 2016, 08:29:34 am »
250Ω 500Ω and 50µF is very common.
« Last Edit: September 06, 2016, 09:16:37 am by sluckey »
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Offline Tone Junkie

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Re: SE cathode cap for 6l6
« Reply #2 on: September 06, 2016, 03:31:16 am »
 I have those. I can get right on it.
Many thanks for your constant help.
Bill



Offline tubenit

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Re: SE cathode cap for 6l6
« Reply #3 on: September 06, 2016, 05:01:17 am »
« Last Edit: September 06, 2016, 05:03:46 am by tubenit »

Offline TIMBO

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Re: SE cathode cap for 6l6
« Reply #4 on: September 06, 2016, 05:06:34 am »
Hey Bill, Champ schem below. :icon_biggrin:

Offline shooter

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Re: SE cathode cap for 6l6
« Reply #5 on: September 06, 2016, 08:16:18 am »
Sluckey picked it, 50uF is a good value.  I tend to increase the cap size with power, no logic other than everything sounds *tighter*, I typically use 100uf for KT88, 50uF (each tube) on PSE '84's, 6V6's and 6L6's.

Timbo, how well does the *bias* pot work on that champ?
Went Class C for efficiency

Offline sluckey

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Re: SE cathode cap for 6l6
« Reply #6 on: September 06, 2016, 09:15:21 am »
Hey, I jumped the gun on the resistor value. I had blinders on and overlooked the "SE" for some reason. A 500Ω or 470Ω would be a better choice for a single 6L6. Sorry.
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Offline TIMBO

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Re: SE cathode cap for 6l6
« Reply #7 on: September 06, 2016, 01:56:46 pm »
Hey shooter, This schem was in my library and I have no idea of its origans, but looks interesting :icon_biggrin:

Offline kagliostro

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Re: SE cathode cap for 6l6
« Reply #8 on: September 06, 2016, 02:02:45 pm »
On the link Tubenit posted

http://el34world.com/Forum/index.php?topic=20470.0

I posted a Weber schematic that uses 807 tube, the 807 is the same of 6L6 (only with TopCap)

and there the choice was 300R + 25uF

on one other schematic with 6L6 that I posted in the same thread

the choice was 500R + 50uF

I think that a bit of experimentation must be done before to decide a definite way

Franco
« Last Edit: September 06, 2016, 02:05:35 pm by kagliostro »
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Offline PRR

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Re: SE cathode cap for 6l6
« Reply #9 on: September 06, 2016, 03:02:30 pm »
If the cathode resistor isn't something like Rload/14 (for 6V6 6L6 EL34 6550), then something is mis-matched.

I'd worry first about a reasonable fit between available B+, load, and plate dissipation.

Offline shooter

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Re: SE cathode cap for 6l6
« Reply #10 on: September 06, 2016, 08:34:02 pm »
Quote
but looks interesting :icon_biggrin:
Thanks Timbo, that it does, I see a stand-alone PA in my crystal skull,
might add some biased pot :icon_biggrin:
Went Class C for efficiency

Offline Tone Junkie

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Re: SE cathode cap for 6l6
« Reply #11 on: September 06, 2016, 11:11:52 pm »
Thanks guys

 


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