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casken
Hobbyist
Joined: 06 Nov 2009
Posts: 5
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 Posted: Fri Nov 06, 2009 6:03 am Post subject: Bias Recommendations |
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I have a Fender Pro Tube Series 1X12 Concert Amp. What is the bias setting recommendation for the Power Tubes? I appreciate any help you could offer.
Casken |
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casken
Hobbyist
Joined: 06 Nov 2009
Posts: 5
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| Posted: Fri Nov 06, 2009 7:57 am Post subject: |
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I am being told by someone on another board that there is not a bias adjustment on the amp. Can anyone confirm that?
Would that mean it is just plug and play? |
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atolleter
Professional Musician
Joined: 25 Feb 2008
Posts: 1403
Location: Westchester County, NY
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| Posted: Fri Nov 06, 2009 11:03 am Post subject: |
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| I dont think it is a cathode bias. It is fixed which will require a re bias. Let's see what others have to say. |
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63supro
Professional Musician
Joined: 07 Aug 2007
Posts: 2347
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casken
Hobbyist
Joined: 06 Nov 2009
Posts: 5
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| Posted: Fri Nov 06, 2009 12:39 pm Post subject: |
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| I was pretty sure it was a fixed bias...what is the recommended setting for the power tubes? THis will be my first run at doing it myself. |
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aclempoppi
Roadie
Joined: 26 Jun 2009
Posts: 243
Location: Harvard IL
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| Posted: Fri Nov 06, 2009 6:34 pm Post subject: |
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Casken, unfortunately there is no set number. There is only a safe operating range for tubes. One method is to adjust the bias by ear until you find the sound you like, then check that it's in the safe range. You can find a "bias calculator" on various sites, one being:www.tedweber.com go to the bias rite, and scroll down to "bias calculator." After looking at the schematic, it appears there is a seperate board with bias and balance controls.(power amp schem, coordinates 1,A-B) On some '90s amps these boards were an option, not sure about yours. My experience is mostly with the older amps. I'm afraid the PDF files are not clear enough for these old eyes, but if you can scour the layout you should find the circuit. ART
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casken
Hobbyist
Joined: 06 Nov 2009
Posts: 5
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| Posted: Sat Nov 07, 2009 5:31 am Post subject: |
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Art, thanks for the info. The schematic you speak of...where did you find it? I bought the amp used and have no ppw with it. I appreciate your time.
Casken |
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casken
Hobbyist
Joined: 06 Nov 2009
Posts: 5
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| Posted: Sat Nov 07, 2009 5:38 am Post subject: |
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| Art...nevermind I found the schematic...thank you sir. |
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