quicksilver 8417 biasing

ozdiyer · 23rd August 2007, 10:22 PM

i have heard that it is possible to modify qs 8417 so that matched pairs of output tubes are not necessary. Could anyone please oblige with this mod?

Original Burnedfingers · 24th August 2007, 10:55 AM

I drilled my chassis and installed a second bias pot. I wired one pot in to each output tube. I pulled out the 1/4 mono jack for the bias and installed a stereo jack in which two meters are wired.

So you now have one control for each output tube and one meter for each tube. You can now adjust your little hart away and use your unmatched tubes.

ozdiyer · 26th August 2007, 07:54 PM

many thanks for the info joe, i have schematic and think i will try uncle ned's mod too after i brush up on the physics.

regards paul

23rd August 2007, 10:22 PM	#1
ozdiyer diyAudio Member Join Date: Aug 2007	quicksilver 8417 biasing i have heard that it is possible to modify qs 8417 so that matched pairs of output tubes are not necessary. Could anyone please oblige with this mod?

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24th August 2007, 10:55 AM	#2
Original Burnedfingers diyAudio Member Join Date: Nov 2002	I drilled my chassis and installed a second bias pot. I wired one pot in to each output tube. I pulled out the 1/4 mono jack for the bias and installed a stereo jack in which two meters are wired. So you now have one control for each output tube and one meter for each tube. You can now adjust your little hart away and use your unmatched tubes.

26th August 2007, 07:54 PM	#3
ozdiyer diyAudio Member Join Date: Aug 2007	many thanks for the info joe, i have schematic and think i will try uncle ned's mod too after i brush up on the physics. regards paul

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