Power supply cap question: replacment values for old Fender

[kingsxman]

I'm replacing alot of the electrolytic caps on an old fender Showman. The power supply caps that I'm taking out of the dog house are 70ufd@300v and 20ufd@525 volts. In looking around for replacments....how close do the values have to be?

Hoffman amps has 100ufd@400v and 20ufd@500v.
Antique Electonics: 80ufd@450 and 20urd@600v. I know I can go more on voltage...

 

[RussB]

Sprague Atoms or F&T's

I use either 80uf or 100uf in series, at least 350v. The 20/600's will not fit in the doghouse!

 

[Nolatone Ampworks]

for safety, the voltages are important. You want to say fairly close to the uf values to maintain the feel of the amp.

As RussB suggests, you can use combinations of series and parallel to ge the values you need, just make sure you understand the formulas for series/parallel capacitance and voltage.

 

[WaltC]

right now I'd probably go w/ the 80uF/450 (two) and 20uF/500V's (three) from Antique Elec. just 'cause I'm working with F&Ts right now and having good luck. the Sprague 100uF/400's and 20uF/500's will probably do as well and can be had from either Hoffman or Antique Elec.

 

[mbratch]

You don't have to have exact values. The 80uF will work fine instead of 70uF, for example. It's commonly done.

 

[kingsxman]

for safety, the voltages are important. You want to say fairly close to the uf values to maintain the feel of the amp.

As RussB suggests, you can use combinations of series and parallel to ge the values you need, just make sure you understand the formulas for series/parallel capacitance and voltage.

Final Question to all: so its ok if the old cap was rated at 525v to put in a 500v? It seems to be about the only way to go if the 600v wont fit in the dog house..

Thanks all.

 

[WaltC]

yup, it'll work. You're probably working w/ 420-450V on that amp.