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What type of capacitors?

 
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WildIowa



Joined: 06 Mar 2004
Posts: 490
Location: Henderson IA

PostPosted: Tue Jan 26, 2016 4:52 pm    Post subject: What type of capacitors? Reply with quote

I am replacing the original multicap in a very old Gibson GA-5, actually an early 50's Les Paul TV Model amp. Looks to have two 10 mfd and a single 20mfd, 450 volts.

Since this amp is that old replacing the big power cap is a good idea I think. I am going to go with three separate capacitors and maybe go up to 500 volts. But what exactly am I ordering? Are they technically called electrolytic capacitors? They are polarized (+ & -) I know. Just wondering what terminology I am looking for, there are many capacitor types and layouts. Will go to DigiKey or Mouser.

Also, while we're here...do the remaining capacitors need replaced?? I think the biggies are always a good idea but some say leave the rest alone as they give the amp the tone and soul of age etc....thanks for the help...

IA
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statorvane



Joined: 21 Aug 2003
Posts: 1950
Location: Upstate New York

PostPosted: Tue Jan 26, 2016 5:11 pm    Post subject: Reply with quote

Yes, they are electrolytic multi-section caps. AES has a bunch to choose from. I did not see an exact match but a 10/10/10/10 uF at 450 volts could be wired to produce 20/10/10 uF; listed here:

https://www.tubesandmore.com/products/C-EC10X4-450

I am not familiar with the amp, but I am guessing it is cathode biased, so there may be bypass capacitors - typically electrolytic that could be replaced as well. If you don't replace them, you may need to reform them.
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BrightKJ



Joined: 13 Sep 2008
Posts: 342
Location: Midlothian, VA

PostPosted: Tue Jan 26, 2016 11:26 pm    Post subject: Reply with quote

Just by rule of thumb... ANY electrolytic capacitor more than 20 years old has served its intended lifespan and needs to be replaced, because it is no longer anywhere near its designed specification.
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