Schematics: What does this mean?

[yug]

I'm trying to decipher an old Fender schematic to use as the basis for a Pignose mod. I just can't seem to figure out what is meant by the capacitor symbol. No apparent value is given. Just a symbol with + and - marked above and below with additional figures such as 16- and 324.

Any one know how to decipher these symbols?

Thanks,

yug...

[ashcatlt]

Have to see it to be sure, but the "324" looks like a standard cap code. The third digit tells you how many zeroes to put after the other two and that tells you the value in picofarads. 320000 pf in this case. That's 320 nf or .32 uf. The 16- might be 16 pf, but again I might need to see it. Is there any indication of voltage specs for these caps?

[yug]

Thanks for responding. Here is a diagram similar to what I'm looking at.The applied voltage is 410VAC.



Hope this helps






EDITed to make the image appear.

[yug]

Okay, that did not work. Still trying to get the hang of posting pix here. I will try again.

[sumgai]

yug,

In your linked example, that would read 16µf at 450vDC.

If you're seeing 324 (which I'd presume to be vDC), you're looking at either a misprint, or possibly an artifact of image compression - ain't no such thing.

I'd have to see where in the circuit the cap is located. If it's in the cathode of a pre-amp tube, then I'd expect that to be 32vDC, a fairly common value. If it's in the B+ section (high voltage) of the power supply, then I'd expect to see 350vDC, very common for a filter capacitor.

Can you post* the exact schematic about which you have questions?

HTH



sumgai


* To post an image, use only the img and /img tags - don't use the url and /url pair. And in imageshack-speak, a "-th" at the end means a thumbnail, which will come across as really small.

hth

[yug]

That particular part of the circuit relates to the standby switch. In the original post, I was just trying to post using numbers I thought I remembered. The diagram shows the actual numbers in the circuit I want to add that to the Pignose.I think the Pig needs a standby switch to let the tubes warm up before use. Why they didn't think of that I can't imagine. I just want to duplicate it for the pig.

I guess the thing I'm having trouble wrapping my head around is the very different values for capacitors from different eras. These are old schematics and I have no idea how to interpret the numbers to assigned values of capacitors. I will PM the schematic to you so you can see what I'm up against. For all I know, these could be hand-wound Sprague caps made just for Fender.

Thanks,

yug...