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Capacitor Substitution

B

bnesound

Guest
I am seeking some help on a replacement value for an ancient .1uf 200vdc cap.

The cap is on a mic/control switch on an old console and it's function is to prevent a pop or click in the audio circuit.

The console utilizes -30vcd.

Can anyone suggest a modern replacement from radio shack?

Thanks

[email protected]
 
I dont know what Radio Shack has but most any .1uf cap with a voltage rating of 200 volts or greater should work. It is safe to use a capacitor with a higher voltage rateing but not a good idea to use one rated at a lower voltage. If radio shack dosent have something. You should be able to find one in most any old junk radio or TV set. I dont think the type such as a disk or a tubular should matter as long as you have room to install it.
Hope this helps.
 
i forgot to add it's an electrolytic. Can you sub a mylar for electrolytic?
 
Not a good idea, although perhaps an "orange drop" type film cap may work. On a console that old, I would dig deeper, make a list of the electrolytic caps in it, and place an order with Mouser (www.mouser.com). They probably have a replacement for the 200 volt cap. you need as well. Many common capacitor values will cost you just pennies each, much cheaper than Radio Shack. Mouser doesn't have a minimum order, but, of course, you have to pay shipping, so it makes sense to to order a number of parts at once, as a $30 dollar cap order costs just as much to ship as a $10 order.

Then go down to "the Shack" and pick up a roll or two of their de-soldering braid, will speed the job of replacing all those capacitors. On the way stop at the stationery store for a fine point Sharpie. Good for marking the polarity of caps on printed circuit boards-just put a dot at the positive end of the old cap before removing it. (Unsolder old cap--telephone rings--ten minutes later--now, where was I? Been There, Done That!).

Have fun.
 
Mouser has nothing close. Can anyone suggest an Electrolytic value that can substitute for .1uf 200v cap?
 
Radio Shack sells a 0.1 uF film capacitor that is perfect for you. Easy to find too..it's blue (part 272-1053). A film capacitor is ALWAYS better than an electrolytic capacitor of the same value. The electrical advantages of film capacitors are many but the only advantage (that I know of) that an electrolytic capacitor has is it's compact size.
 
Sounds like that cap is just for noise suppression and to protect the contacts from arcing when the switch opens. Any .1mfd cap at 200V will work.

Is this a tube console? what is the function of the switch?


Pete
 
it's not a tube device, transistor. and yes you are right it's for noise suppression as this switch not only makes the connection for the microphone but also activates the relays to mute the monitor circuit.
 
I have about 100 little red .1uf caps, these have short leads, about 1/4 inch long. These are made to mount on a PC board but you can mount them other ways. If you want me to send you a few shoot me a message at <[email protected]>. I'll be glad to ship you a few at no charge.
 
The RS parts are nearby and I'll give them a shot. Thank you for the offer.
 
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