Burnt out potentiometer value

[stopperstopstops]

Hi,
I am trying to find the value of a burnt out potentiometer. It is the gain pot for a crate gx80 solid state keyboard/guitar amp.
The back reads "70-104-23 9333 ROC"
Thank you for your help.

[armdnrdy]

The Gain pot is a 100KB.

B = Linear

The schematic is on the net.

You can also disconnect the pot from the circuit and take a reading with an ohmmeter/DMM across the two outer lugs. 1 and 3.

This measurement will be the pot resistance value.

[antonis]

Perhaps you have to trace the origin of the "fire"...

[Ice-9]

For when its not possible to find a schematic or no pot markings are evident you can usually take the wafer out the pot and measure the track resistance. Quite often a pot will burn out very near one end of the track so an educated guess can be made from a reading (good end to track burn). You can also determine the slope by moving the meter lead along the trace that's left.

[duck_arse]

whelp, I typed "70-104-23 pot" into a common search engine, and the first return gave me a page containing this:

http://www.ebay.com/itm/Crate-Ampeg-SLM-70-104-23-100K-Potentiometer-1-2-Small-Knurled-Shaft-/321519010195?pt=LH_DefaultDomain_0&hash=item4adc06c193

which, at a guess, is what you are looking for. the "104" part is the resisatnce, "9333" would be the manufacture date of the 33rd week of 1993, somewhere in the "republic of china" (if that's a real place).

[edit :] or, the "104" part is the resistance ....

[karbomusic]

which, at a guess, is what you are looking for. the "104" part is the resisatnce

Yes, that should mean 10 with 4 additional zeros or 100000

At least that's how it worked with the bin multi-valued trimmers I dropped and exploded into a random pile by mistake last year.    That's how I resorted them without metering every one.

[digi2t]

Perhaps you have to trace the origin of the "fire"...

Yup...

[GibsonGM]

DA - Republic of China (ROC) is Taiwan...the 'old' Chinese government went into exile there when the Chicoms took over!  

[GGBB]

The Gain pot is a 100KB.

B = Linear

Actually, if I'm reading the schematic correctly, it's 100KRA which I would take to mean reverse audio. Elsewhere on the schematic are listed "A" and "L" suffixed pots.  I have a Crate GX80 but it is on loan at the moment, otherwise I would check it.

[armdnrdy]

Actually, if I'm reading the schematic correctly, it's 100KRA which I would take to mean reverse audio. Elsewhere on the schematic are listed "A" and "L" suffixed pots.  I have a Crate GX80 but it is on loan at the moment, otherwise I would check it.

Aah...You are reading the schematic correctly!

I took a gander at the schematic section to the left of the one that you linked..and saw Gain P1.
I couldn't see the whole letter after the K but I noticed that it was a straight line and not slanted as in an A or circular as in a C.
Who uses the designation RA?.....I guess Crate did years ago! 
Good catch!