auto bias on a Quicksilver KT-88 amp

Original Burnedfingers · 8th February 2003, 11:28 PM

I have read where the newer models of the Quicksilver line sport auto bias that will allow the switch to different tubes without having to mess with bias adjustments. Would this be a good feature to incorporate into my KT-88 mono's? What would be the pro's and con's of this? How hard would it be to perform this modification?

Joe

fdegrove · 9th February 2003, 12:23 AM

Hi,

Quote:

I have read where the newer models of the Quicksilver line sport auto bias that will allow the switch to different tubes without having to mess with bias adjustments.

Forget this for your existing amps,if the manufacturer hasn't provided for this from the start it is almost (meaning not practical) impossible to retrofit on existing models having fixed bias.

Listen and enjoy QS fans,

Original Burnedfingers · 9th February 2003, 01:11 AM

Frank

Thanks for the reply. If you say it would require too much effort I will forget it and be happy with what I have.

Joel · 10th February 2003, 05:00 PM

To clarify Frank's point - it's not hard to wire in a handful of cathode bias resistors - BUT, you may throw off the negative feedback loop(s) if there are any, and you will change the power output and possibly the loadline. Distortion could also be affected.

wheezer · 15th February 2003, 02:40 PM

Hi Joe,
Most of Mike's amps these days, and for several years past are self-biasing except for the HIGHER priced ones .

8th February 2003, 11:28 PM	#1
Original Burnedfingers diyAudio Member Join Date: Nov 2002	auto bias on a Quicksilver KT-88 amp I have read where the newer models of the Quicksilver line sport auto bias that will allow the switch to different tubes without having to mess with bias adjustments. Would this be a good feature to incorporate into my KT-88 mono's? What would be the pro's and con's of this? How hard would it be to perform this modification? Joe

15th February 2003, 02:40 PM	#5
wheezer diyAudio Member Join Date: Dec 2002 Location: Boca Raton, FL.	Cathode Bias Hi Joe, Most of Mike's amps these days, and for several years past are self-biasing except for the HIGHER priced ones .

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9th February 2003, 01:11 AM	#3
Original Burnedfingers diyAudio Member Join Date: Nov 2002	Frank Thanks for the reply. If you say it would require too much effort I will forget it and be happy with what I have.

10th February 2003, 05:00 PM	#4
Joel diyAudio Member Join Date: Oct 2002 Location: Brooklyn, NY	To clarify Frank's point - it's not hard to wire in a handful of cathode bias resistors - BUT, you may throw off the negative feedback loop(s) if there are any, and you will change the power output and possibly the loadline. Distortion could also be affected.