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Post new topic Twin Bias settings ?????
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Author Topic:  Twin Bias settings ?????
Tele


From:
Andy W. - Wolfenbuettel, Germany
Post Posted 23 May 2000 1:51 pm     Reply with quote

Hi to ya all...

I have a 59 Tweed Twin with 4 5881 tubes which puts out around 80 Watts. I expect it to be cleaner than it is, it goes into distortion around 4-5 on the dial which is quite loud but the distortion could be more harmonic and the amps appears not to have its full power.
Aren't these Fenders fixed-bias ?? What to do?

Andy
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Rich Paton


From:
Santa Maria, CA.,
Post Posted 23 May 2000 2:14 pm     Reply with quote

Tele, it needs servicing, before something expensive goes out.
Go here and post your question under the "Fender Amps, Vintage" forum. You'll no doubt enjoy the Fender-oriented sitem, in any case.
http://www.fenderforum.com/

It's a moderated site like this one, so you need to register but that only takes a minute or so.

There are some great amp techs there who will share their expertise. I do tube amps, but that old a model is more their "bag" than my usual work.
Good Luck!
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Jay Ganz


From:
Out Behind The Barn
Post Posted 23 May 2000 2:41 pm     Reply with quote

Usually the output tubes are supposed have
about 35ma flowing thru each one. A little
less will "clean up the sound". The negative
voltage that comes from the fixed bias supply
would have to be varied to change this current flow, or other output tubes could be
used. Each tube draws differently. BUT before any of that, make sure your
tubes are alright (obviously). Then voltages
have to be checked thru out the circuit to
make sure they're all within range. When's
the last time you had it serviced?
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Donny Hinson


From:
Glen Burnie, Md. U.S.A.
Post Posted 24 May 2000 5:24 pm     Reply with quote

Make sure it's not just the speakers that are not causing the problem, and then take it to a good tube tech. Being 41 years old, it probably needs a thorough going over!
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Tele


From:
Andy W. - Wolfenbuettel, Germany
Post Posted 28 May 2000 11:13 pm     Reply with quote

Donny,

shame on me - it is just a speaker. I checked it with my amp tech and we played it through a newer 12" EV and it sounded so great.
One of the Jensens sounds real dirty, however it is not blown. I think they are not capeable to handle the power of the 4x 5881 tubes.
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Jay Ganz


From:
Out Behind The Barn
Post Posted 29 May 2000 6:45 am     Reply with quote

If they're the correct P12N's that're supposed to be in there, they should handle the power.
What will damage them
is pulling the cord out of your guitar (by accident)with the amp volume up.
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Tele


From:
Andy W. - Wolfenbuettel, Germany
Post Posted 29 May 2000 9:10 am     Reply with quote

unfortunately the speakers are early 60s C12N which should handle the power as well as the P12N but I read that the original 1950s P12N could handle only 30 Watts and that Twins with original Alnico speakers are quite rare.
The Twin sounded great with the ceramic speakers, however since they are not the originals I think I will replace the with JBLs if the cabinet is deep enough. Anyone knows how deep JBL D120F are?
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