Replacing main filter caps, need to re-bias? - Page 2

sam9 · 13th May 2007, 07:06 PM

Were those open frame trimpots or the more substantial Bourns multi-turns?

I'm kind of ham-fisted and find the single turn type hard to cope with, anyway.

Leolabs · 14th May 2007, 02:48 AM

Bypass with something like 2.2u + 0.1u.

unclejed613 · 16th May 2007, 12:29 AM

best way to set bias is with a distortion analyzer at 1w/20khz. you can actually see the crossover notch disappear

unclejed613 · 16th May 2007, 12:41 AM

best way to set bias is with a distortion analyzer at 1w/20khz. you can actually see the crossover notch disappear

sam9 · 16th May 2007, 01:20 AM

Unfortunately, not too many hobbyists have distortion analyzers.

16th May 2007, 12:29 AM	#13
unclejed613 diyAudio Member Join Date: Dec 2006	best way to set bias is with a distortion analyzer at 1w/20khz. you can actually see the crossover notch disappear __________________ Vintage Audio and Pro-Audio repair ampz(removethis)@sohonet.net spammer trap: http://www1284177414881.v-dc.net/

16th May 2007, 12:41 AM	#14
unclejed613 diyAudio Member Join Date: Dec 2006	best way to set bias is with a distortion analyzer at 1w/20khz. you can actually see the crossover notch disappear __________________ Vintage Audio and Pro-Audio repair ampz(removethis)@sohonet.net spammer trap: http://www1284177414881.v-dc.net/

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13th May 2007, 07:06 PM	#11
sam9 diyAudio Member Join Date: Jun 2002 Location: Left Coast	Were those open frame trimpots or the more substantial Bourns multi-turns? I'm kind of ham-fisted and find the single turn type hard to cope with, anyway.

14th May 2007, 02:48 AM	#12
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Bypass with something like 2.2u + 0.1u.

16th May 2007, 01:20 AM	#15
sam9 diyAudio Member Join Date: Jun 2002 Location: Left Coast	Unfortunately, not too many hobbyists have distortion analyzers.

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