New caps in C+

Pre Recto days. Boogie modified Fenders, Mark I-IV, Dual Calibers, etc

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woodbutcher65
Mark III
Posts: 182
Joined: Fri May 04, 2018 10:36 pm

Re: New caps in C+

Post by woodbutcher65 » Mon Feb 18, 2019 7:24 pm

I can only tell you that I've seen 0.1 uF coupling caps fail after replacing all the power supply electrolytics often enough that I'm on the watch for that issue any time I recap an amp. In the past year I've had that happen to both my own Mark III and a friend's Mark IIB.

Don't change them without reason but if suddenly you've got red plating tubes in one (or two) sockets and it's not the bias electrolytic or the tubes, the coupling caps are most likely to be the culprits.

Henz
Mark II
Posts: 102
Joined: Wed May 18, 2016 11:05 pm

Re: New caps in C+

Post by Henz » Mon Feb 18, 2019 7:34 pm

Thanks for the reply. They are 35 yrs. old. Don't know if age degrades parts but all through those years, I had many red plating tubes. A screen grid resistor exploded. I have them so I'm gonna put them in. How do you feel about those Belton power tube sockets? The female inserts only have two leads that would just touch each side of power tube pin. Some people say it's no good. I have new ones (Belton) and I'm unsure as to what to do.Thanks, Jim
MKIIC+
2:90
4x12 Recto Cab w/ Eminence and V30's
Home made 2x12 half open cab w/ Eminence and V30's
Rocktron Patchmate, Rocktron Intellifex, TS10 Tubescreamer

woodbutcher65
Mark III
Posts: 182
Joined: Fri May 04, 2018 10:36 pm

Re: New caps in C+

Post by woodbutcher65 » Tue Feb 19, 2019 11:53 pm

I'd only replace the tube sockets with ceramic sockets with silver or gold plated contacts. If I replaced them at all.

I see no reason to replace tube sockets that are giving you no problems.

However, be aware that comblock tubes have smaller pin diameters than American and European tubes so it is possible that socket replacement is a good idea depending on how good the socket's grip on the tube pins is.

Caps are a necessary maintenance item. So are tubes. Other maintenance items are all the controls and jacks.

But for the most part, everything else should be lifetime parts.

Henz
Mark II
Posts: 102
Joined: Wed May 18, 2016 11:05 pm

Re: New caps in C+

Post by Henz » Fri Feb 22, 2019 12:45 am

The tube sockets are just old and worn from rolling all of these years. I've replaced many single female pins from parts laying around. I thought that a total new replacement would be good. But, as you suggested, I'm not happy with the Beltons too. I did change the coupling caps tonight. Since that you've heard this info about my sockets, would you replace them? They do still work but I'm picky. Thanks, Jim
MKIIC+
2:90
4x12 Recto Cab w/ Eminence and V30's
Home made 2x12 half open cab w/ Eminence and V30's
Rocktron Patchmate, Rocktron Intellifex, TS10 Tubescreamer

woodbutcher65
Mark III
Posts: 182
Joined: Fri May 04, 2018 10:36 pm

Re: New caps in C+

Post by woodbutcher65 » Fri Feb 22, 2019 9:43 pm

If they're not causing a problem just leave them alone. If they're causing a problem, change them.

It's that simple.

Don't mess with success, is one way of putting it.

If the sockets aren't causing noisy tube problems or letting tubes drop out of their sockets, there will be no benefit to replacing them. New sockets won't change the amp's sound.

Resist the urge to mess with what isn't messing up.

Henz
Mark II
Posts: 102
Joined: Wed May 18, 2016 11:05 pm

Re: New caps in C+

Post by Henz » Mon Feb 25, 2019 1:19 am

Thanks for the reply. I'll leave them alone. Gotta ask ya, any good reviews on that mod where you put a 100k resistor between volume and treble pot? Combined with a 15u cap 10v tant? on V2 ?cathode. I seen a gut shot of the 100k mod on a C+ Simul. What would that do to tone? Thanks, Jim
MKIIC+
2:90
4x12 Recto Cab w/ Eminence and V30's
Home made 2x12 half open cab w/ Eminence and V30's
Rocktron Patchmate, Rocktron Intellifex, TS10 Tubescreamer

woodbutcher65
Mark III
Posts: 182
Joined: Fri May 04, 2018 10:36 pm

Re: New caps in C+

Post by woodbutcher65 » Wed Feb 27, 2019 8:37 pm

Why don't you try it and find out for yourself? It's two components. If you know to hold the cold end of a soldering iron and can solder with reasonable results you can do this.

Asking for other people's opinions on something that you can do for yourself is unnecessary and may lead you down the wrong path.

Find out for yourself. Then the only opinion that matters is your own.

Henz
Mark II
Posts: 102
Joined: Wed May 18, 2016 11:05 pm

Re: New caps in C+

Post by Henz » Sat Mar 23, 2019 11:57 pm

Post deleted.
Last edited by Henz on Mon Apr 15, 2019 11:11 pm, edited 4 times in total.
MKIIC+
2:90
4x12 Recto Cab w/ Eminence and V30's
Home made 2x12 half open cab w/ Eminence and V30's
Rocktron Patchmate, Rocktron Intellifex, TS10 Tubescreamer

Henz
Mark II
Posts: 102
Joined: Wed May 18, 2016 11:05 pm

Re: New caps in C+

Post by Henz » Wed Apr 03, 2019 11:36 pm

Post deleted
Last edited by Henz on Mon Apr 15, 2019 11:10 pm, edited 1 time in total.
MKIIC+
2:90
4x12 Recto Cab w/ Eminence and V30's
Home made 2x12 half open cab w/ Eminence and V30's
Rocktron Patchmate, Rocktron Intellifex, TS10 Tubescreamer

Henz
Mark II
Posts: 102
Joined: Wed May 18, 2016 11:05 pm

Re: New caps in C+

Post by Henz » Mon Apr 15, 2019 12:34 am

Post deleted.
MKIIC+
2:90
4x12 Recto Cab w/ Eminence and V30's
Home made 2x12 half open cab w/ Eminence and V30's
Rocktron Patchmate, Rocktron Intellifex, TS10 Tubescreamer

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