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Old 23rd August 2007, 10:22 PM   #1
ozdiyer is offline ozdiyer  Australia
diyAudio Member
Join Date: Aug 2007
Location: Euroa Victoria
Question 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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Old 24th August 2007, 10:55 AM   #2
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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.
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Old 26th August 2007, 07:54 PM   #3
ozdiyer is offline ozdiyer  Australia
diyAudio Member
Join Date: Aug 2007
Location: Euroa Victoria
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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