Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: plexi50 on July 02, 2011, 09:22:09 pm

Title: Fender Vibrosonic PS Capacitors
Post by: plexi50 on July 02, 2011, 09:22:09 pm

I cant believe my eyes. 20uf/600VDC capacitors for the fender Vibrosonic are $21.00 each. I need 7 of them. I see 448VDC on the plates of the power tubes. I dont think i can get away with 20uf/500VDC caps. Im sure there is a B+ surge after flipping the standby before the tubes draw the current down.  :cussing:

Title: Re: Fender Vibrosonic PS Capacitors
Post by: John on July 02, 2011, 09:33:37 pm

http://www.freewebs.com/valvewizard1/standby.html (http://www.freewebs.com/valvewizard1/standby.html)

That is a really interesting read about standby switches, and what I found most interesting was the resistor in parallel with the standby switch "if you really think you need one". (his words, not mine)

Not saying you shouldn't go with the 600V'ers, but I just read that article today and this seemed an appropriate thread for it. :)

Title: Re: Fender Vibrosonic PS Capacitors
Post by: plexi50 on July 02, 2011, 09:48:32 pm

Quote from: John on July 02, 2011, 09:33:37 pm

http://www.freewebs.com/valvewizard1/standby.html (http://www.freewebs.com/valvewizard1/standby.html)

That is a really interesting read about standby switches, and what I found most interesting was the resistor in parallel with the standby switch "if you really think you need one". (his words, not mine)

Not saying you shouldn't go with the 600V'ers, but I just read that article today and this seemed an appropriate thread for it. :)

Excellent reading. I have seen this before but never thought of applying it to the standby switch. Merlin is a Wizard for sure  :worthy1:

Title: Re: Fender Vibrosonic PS Capacitors
Post by: jjasilli on July 02, 2011, 10:58:25 pm

You could put lesser voltage caps in series:  use Doug's; or Antique:  Capacitor - Axial Lead Electrolytic, 47 µF @ 350 VDC $2.80 ea x 12 + bleeder resistors for ea -- less than $40.00.

Title: Re: Fender Vibrosonic PS Capacitors
Post by: plexi50 on July 03, 2011, 12:13:42 pm

Looks like i can do that. Just want it to be a clean job. I still cant get over that 20uf/600VDC axial caps are $21.00 a piece? Wonder what cap cans would cost $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ 

Title: Re: Fender Vibrosonic PS Capacitors
Post by: punkykatt on July 03, 2011, 05:06:00 pm

Weber has 20uf/600v caps for just a couple bucks.  They have short leads though.

Title: Re: Fender Vibrosonic PS Capacitors
Post by: mresistor on July 03, 2011, 06:45:42 pm

The guy at justradios.com has them priced at 3 ea for $20. A great seller too. Caps are fresh. Cornell-Dublier I believe.

http://cgi.ebay.com/20uF-600V-Axial-leaded-Electrolytic-Capacitors-QTY-3-/300546690741?pt=LH_DefaultDomain_2&hash=item45f9fa8eb5 (http://cgi.ebay.com/20uF-600V-Axial-leaded-Electrolytic-Capacitors-QTY-3-/300546690741?pt=LH_DefaultDomain_2&hash=item45f9fa8eb5)

http://www.justradios.com/capacitors.html (http://www.justradios.com/capacitors.html)

Title: Re: Fender Vibrosonic PS Capacitors
Post by: plexi50 on July 03, 2011, 07:29:55 pm

Thanks for all the info and have a Happy 4th. Im barbecuing and staying home. Too many people. It's a Zoo on a good day here