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Post subject: 1970's Silverface twin reverb capacitors
Posted: Tue Dec 02, 2008 11:57 am
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I recently acquired a seventies era silverface twin reverb as a project amp. When I power on the amp all the tubes glow normal but there is no sound. My first assumption is this amp is far over due for a tube change and capacitor kit. I've found the tubes I want on eurotubes but I was wondering about the capacitor kits on ebay. Any opinions? Is there anything I need to be looking for when buying these kits. I'm not to worried about "restoring" with NOS parts I just want get my hands dirty working on it and teach myself how it works.

I know that I should probably take it to a shop but the whole reason I bought this amp was to learn a little bit about tube amps. It only cost me $50 so I'm not really worried about hurting anything.

Example -

http://cgi.ebay.com/Fender-Pro-Super-or-Twin-Reverb-Capacitor-Kit_W0QQitemZ330277641711QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item330277641711&_trksid=p3286.c0.m14&_trkparms=72%3A570%7C66%3A2%7C65%3A12%7C39%3A1%7C240%3A1318


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Post subject:
Posted: Tue Dec 02, 2008 9:09 pm
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Hi,
I am currently in the process of rebuilding my 1972 Twin Reverb also. If your electrolytic caps have not been replaced it's definitely time. This is what led to my rebuild. I did check cap price on EBay and they were considerably higher than priced elsewhere and they typically did not tell you exactly what values and voltages the package includes. There have been many cap changes through the years and it is important to understand exactly what you are getting. Not knowing your background I must tell you that inside the chassis are very lethal high voltages and that capacitors will hold this voltage after the amp is turned off and unplugged. It is very easy to kill yourself even if you are careful.

I got my capacitors very reasonably through Doug Hoffman. His prices are good, had everything in stock and ships really fast. Google "EL34 World" to find the site. Do not Google "Hoffman Amplifier" right now as it appears there has been an DNS hijack of this link to malware. By the way the Chicago electrolytes are much cheaper than the Sprague caps and are good.

Good Luck


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Posted: Wed Dec 03, 2008 12:29 pm
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Ok thank you very much! I will browse the provided site and try to figure out it this is something I can do. I'm trying to find an amp tech that will let me sit in with him so I can ask questions but I know that does get very annoying.

Thanks!


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Posted: Wed Dec 03, 2008 3:27 pm
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Your quite welcome. Spend some time in the "The tube amp Library of Information" at this site. There is great information on recapping tube amps here including Fenders.


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