I need a DOD old yeller schem please

[Wild E]

I have an old yellow DOD OD PREAMP/ 250 that I've had for so long I don't remember when or where I got it. It has been through a rough life. one of the caps, (the only ceramic disk) became damaged and I can't make out the value.
All the schematics I've found online and through links here show the same schematic with the same caption,"yet another 741..."
My problem is my chip is a TL081.
Does anyone have one like this that they can check for me?
The circuit board has a dot sticker that has 55 hand written and a rectangular sticker that has 45 324 also hand written on the inside of the case.
It still works but I would like to get it back to what it's supposed to be. Any help would be greatly appreciated.

[Steve Mavronis]

Do you have pictures? You might be able to date it by the code written on the pots. Follow this example that I found on the net:

DOD's pots of 70s and some of 80s era were manufactured by CTS Corporation. There are seven digits on the pot. The first three digits are CTS's manufacturing code number: 137. The next four digits is the date: 8042. For example 1378042: 137 means it was made by CTS, and 8042 means it was made in 1980 in the 42nd week. (This is the date that the Pot was made NOT the effects unit.)
Back then it may have taken anywhere from the start of the production date to several weeks, or even more, for the pot to reach the pedals manufacturer. And it may also have taken time for the pots to be installed in to the effect/s. Ultimately, the effect was made much after the oldest date engraved on the pots.

[Wild E]

I haven't  taken it apart yet. I still use it from time to time between tests of what I'm working on. The pots are PC mount and therefore behind the circuit board.

[Steve Mavronis]

You might be able to see the code with a dentist mirror and/or magnifying glass. But I've been collecting circuit board pictures of the 70's grays and 80's yellows so maybe I can match something up with a photo of yours if you can post it. Or can you describe which components the trace lines from the cap in question is connected to on both sides?

Here is a picture from an 80's yellow 250. Are you talking about the cap next to the IC with 25 (which might mean 25 pF) written on it?

http://home.comcast.net/~snmavronis/80s_yellow_250.jpg

[Wild E]

YES! That's it. Is that 25mF?

[Steve Mavronis]

According to this page: http://www.electronics-tutorials.ws/capacitor/cap_5.html

Where a two number code is used the value of the capacitor only is given in picofarads (ie. 47 = 47 pF).

So 25 should be 25 pF (picofarads)

[Wild E]

Thanks a million Steve. Thanks also for the link to that site, I will be exploring it to see what other useful info I can find.