Re: 5150II (6505+) Mods
Posted:
Sat Sep 08, 2012 2:58 am
by Alain Benoit
Bias mod.
Increased the usable range on the bias control.
Sizable improvement, a must for these amps.
Biased to ~38mA.
Re: 5150II (6505+) Mods
Posted:
Sat Sep 08, 2012 2:59 am
by Alain Benoit
Replaced electrolytic bypass caps with film ones.
No idea why they designed it like this.
Re: 5150II (6505+) Mods
Posted:
Sat Sep 08, 2012 3:01 am
by Alain Benoit
Replaced Ra's with 1 Watt CCF60's.
Re: 5150II (6505+) Mods
Posted:
Sat Sep 08, 2012 3:08 am
by Alain Benoit
Replaced the Illinois Co's with WIMA's.
Re: 5150II (6505+) Mods
Posted:
Sat Sep 08, 2012 3:09 am
by Alain Benoit
Replaced the tired Ruby quad with SED's.
Re: 5150II (6505+) Mods
Posted:
Sat Sep 08, 2012 3:12 am
by Alain Benoit
Experimented replacing the 'pseudo' *cough* choke with an MM multitap, settled on 5H.
Re: 5150II (6505+) Mods
Posted:
Sat Sep 08, 2012 3:14 am
by Alain Benoit
Changed out stripped Phillips screws for 4-40 SS barrel head capscrews.
Silly Yanks.
Re: 5150II (6505+) Mods
Posted:
Sat Sep 08, 2012 3:16 am
by Alain Benoit
Lowered R9.
Reduced fizz a bit, darkened tone, lowered gain.
Re: 5150II (6505+) Mods
Posted:
Sat Sep 08, 2012 3:21 am
by Alain Benoit
Dropped C2 to 22nF.
Loosened attack a smidgen.
Re: 5150II (6505+) Mods
Posted:
Sat Sep 08, 2012 3:29 am
by Alain Benoit
C17 to 470k//2n2F.
Lead channel closer to 5150.
Jury still out.
Re: 5150II (6505+) Mods
Posted:
Sun Sep 09, 2012 12:09 am
by Scott DeVarenne
Thanks for the photo expose. Nice pics, BTW. I understand nothing, but it all looks nice. Bottles of pills in first photo? What? With booze? Careful. You might make sick, you night owl, you.