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Post subject: Re: 64' Twin Reverb bias setting
Posted: Thu Oct 31, 2013 8:02 am
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Joined: Fri Feb 05, 2010 4:31 am
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Location: Province de Québec, Canada
[quote="shimmilou"

To add to what the others have said, no need to worry about the bias in a single-ended amp like a Champ. The Champ, and others are "Cathode biased" and are pretty much self correcting, provided you use like tubes, ie 6V6 for another 6V6. Most preamp tubes are Cathode biased, and are plug and play with no adjustment needed, even when switching from a 12AX7 to a 5751, or 12AT7. "Fixed bias" is the type that needs a bias adjust with change of output tubes. The fixed bias just means that a negative voltage is applied to the grid to set the current through the tube. Some fixed bias amps are adjustable with a pot, and some have no adjustment pot, but a resistor that can be changed to adjust the bias. Your amp would be a fixed bias with an adjustment pot.[/quote]

I have see some class A amp with wrong bias. But this is not critical as AB class amp .


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Post subject: Re: 64' Twin Reverb bias setting
Posted: Thu Nov 21, 2013 2:44 pm
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Ya'll weren't as nice to me when I asked the same question. Upnorth, if your tubes are biased too cold, you'll hear crossover distortion-flabby bass, nasty treble. Tubes biased hot will have more bass response, less treble and will not distort as easily. I also depends on the tubes. Some 6L6's like the Tung Sol reissues and Groove Tube 6L6GE, which I use, sound completely different when biased hot. I like them around 55% dissipation-nice and creamy. Let your ear be the judge and experiment. The guys on this forum are great-best on the net.


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