resource for filter cap replacements

[muscmp]

i'm trying to replace a cap can from a 1965 sears silvertone 1482. the values are 5uf,10uf and 20uf- - 450 volts. i'll be replacing the can with individual caps. i've not had much luck finding these. i have found the 20uf at mouser for $32!!

any recommendations as to where to purchase these 3 caps? also, do i need to strictly stay with the values?

i've attached the schematic for reference.
thanks,
mikeB.

[selloutrr]

tubesandmore.com

In place of 5uf
C-ET4D7-450 Capacitor - Axial Lead Electrolytic, 4.7 µF @ 450 VDC
$1.40 each

10uf
C-ET10-450 Capacitor - Axial Lead Electrolytic, 10 µF @ 450 VDC $1.40 each

20uf
C-ET22-450 Capacitor - Axial Lead Electrolytic, 22 µF @ 450 VDC
$2.20

the caps are usually +/- 20% so you have some wiggle room without any change to the tone.

If you want to replace the can with a multisection
C-EC20-10-10-10 Capacitor - Electrolytic, 20/10/10/10 µF @ 450 VDC
$32.95 each

[Randy Magee]

If you're going with individual caps, Antique Electronics has what you need... you don't have to have the exact values... http://tubesandmore.com/

[muscmp]

hey, thanks for the fast responses!
really appreciate it!!!!

further question: i've heard you should go higher on the voltage. is that really necessary or is that just a precaution? i've heard i should be going up to 600 or so volts.
mikeB.

[selloutrr]

It wont hurt anything to increase the voltage to 600VDC but it will double the physical size of the capacitors. 450Volts will be fine.

[surfsup]

Hmm interesting plate resistor values 330k/220k...could you please post what it sounds like when you are done?

Since your resevoir cap shows 350 on the schemo, i'm thinking 450 is fine. If you pulled the recto tube and went ss for some reason, the pt will put out 330x1.4=460 so if you ever plan to do that it may be something to think about? Someone else should chime in and get a better answer though.

[selloutrr]

sprague makes 450, 500, 600 volt capacitors. round the uF to the closest value.
i.e.
5uf = 4.7uf, 8uf, 10uf.
10uf = 8uf, 10uf
20uf = 20uf, 22uf

if you are keeping the voltage rectifier stock it's a waste of money to buy higher voltage capacitors. I would measure and make sure you have room before you consider increasing the voltage and operating the amplifier with a solid state rectifier.

[muscmp]

sprague makes 450, 500, 600 volt capacitors. round the uF to the closest value.
i.e.
5uf = 4.7uf, 8uf, 10uf.
10uf = 8uf, 10uf
20uf = 20uf, 22uf

if you are keeping the voltage rectifier stock it's a waste of money to buy higher voltage capacitors. I would measure and make sure you have room before you consider increasing the voltage and operating the amplifier with a solid state rectifier.

yes, i''m keeping the rectifier stock.
thanks again for the great responses!!
mikeB.

[Structo]

It's good to go with a higher voltage rating on old amps because the wall voltage was lower a the time they were designed.
Around 110vac

With todays voltages of 120+ vac you end up with a higher B+ throughout the amp.

[selloutrr]

It should only raise the voltage 10% 353V + 10% = ~ 385v which is still safe to run 450Vdc capacitors.
New Production Capacitors are better made to run closer to the operating max voltage then they were when the amp was designed.
If you aren't comfortable with the 450Vdc power rating you can pick a higher voltage with out any change to the tone as long as space allows for the physical size of the larger capacitors.
You may also need to spend more on a name brand capacitor to get the same uF.
look into F&T if the higher voltage rating is something you are interested in.

[muscmp]

i think i'll stick as close to original as possible, but i am curious as to what F&T is.

[selloutrr]

F&T is a german company that makes capacitors.
They are physically smaller then most Sprague brand capacitor making them a good choice in tight builds. They fall in the medium to high price point depending on uf and voltage. They are imported by most tube amplifier supply houses in the USA.

http://www.ftcap.de/seiten/en/home/home.php

[rdjones]

+1 on F&Ts.
No 600V rated ones, though.
For that it's still the HUGE Sprague Atoms.

rd

[gingertube]

For new builds and replacement of old caps I use and recommend Panasonic ED Series. Electrolytic Caps have come a huge way in the last 15 or 20 years mostly as a result of the low ESR requirements for modern switch mode power supplies.
For multi cap cans, I leave the old cans in place and just cut the leads to it and replace the caps with individual capacitors fitted under the chassis.
I try to keep the same value - particularly if there is a tube rectifier.
Cheers,
Ian

[selloutrr]

it's just as easy to cut open the can and replace the old caps with radial new caps if the visual matters.