5150II (6505+) Mods

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5150II (6505+) Mods

Postby Alain Benoit » Sat Sep 08, 2012 1:55 am

Preparations.

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Re: 5150II (6505+) Mods

Postby Alain Benoit » Sat Sep 08, 2012 1:58 am

Bias mod.
Increased the usable range on the bias control.
Sizable improvement, a must for these amps.
Biased to ~38mA.

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Re: 5150II (6505+) Mods

Postby Alain Benoit » Sat Sep 08, 2012 1:59 am

Replaced electrolytic bypass caps with film ones.
No idea why they designed it like this.

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Re: 5150II (6505+) Mods

Postby Alain Benoit » Sat Sep 08, 2012 2:01 am

Replaced Ra's with 1 Watt CCF60's.

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Re: 5150II (6505+) Mods

Postby Alain Benoit » Sat Sep 08, 2012 2:08 am

Replaced the Illinois Co's with WIMA's.

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Re: 5150II (6505+) Mods

Postby Alain Benoit » Sat Sep 08, 2012 2:09 am

Replaced the tired Ruby quad with SED's.

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Re: 5150II (6505+) Mods

Postby Alain Benoit » Sat Sep 08, 2012 2:12 am

Experimented replacing the 'pseudo' *cough* choke with an MM multitap, settled on 5H.

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Re: 5150II (6505+) Mods

Postby Alain Benoit » Sat Sep 08, 2012 2:14 am

Changed out stripped Phillips screws for 4-40 SS barrel head capscrews.
Silly Yanks.

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Re: 5150II (6505+) Mods

Postby Alain Benoit » Sat Sep 08, 2012 2:16 am

Lowered R9.
Reduced fizz a bit, darkened tone, lowered gain.

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Re: 5150II (6505+) Mods

Postby Alain Benoit » Sat Sep 08, 2012 2:21 am

Dropped C2 to 22nF.
Loosened attack a smidgen.

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Re: 5150II (6505+) Mods

Postby Alain Benoit » Sat Sep 08, 2012 2:29 am

C17 to 470k//2n2F.
Lead channel closer to 5150.
Jury still out.

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Re: 5150II (6505+) Mods

Postby Scott DeVarenne » Sat Sep 08, 2012 11:09 pm

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.
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