How do I tell which diode to use if the number is worn off?

Thread Starter

W123

Joined Apr 27, 2011
4
Ive got a Ampeg V-4 guitar amp that the last owner rigged the crap out of so the list of parts to swap is growing. Right now Im just swapping things that are visually degraded (Exploded resistors, juicy caps, stuff that is either worn out or will wear out soon). Ill get deeper into it later.

Sooo, theres this diode which has somehow oozed junk and I want to swap it but the number is worn off. The schematic says F-10 right under the labeling (D5). There really isnt anything else to go off of. What now?
 

BillO

Joined Nov 24, 2008
992
Try to analyze the circuit to determine what the diode was doing. That should give you some clue.
 

HallMark

Joined Apr 3, 2011
89
Ive got a Ampeg V-4 guitar amp that the last owner rigged the crap out of so the list of parts to swap is growing. Right now Im just swapping things that are visually degraded (Exploded resistors, juicy caps, stuff that is either worn out or will wear out soon). Ill get deeper into it later.

Sooo, theres this diode which has somehow oozed junk and I want to swap it but the number is worn off. The schematic says F-10 right under the labeling (D5). There really isnt anything else to go off of. What now?
As the number is erased it may be diode to drop 0.3 or 0.7 Volt or it may be Schottkey diode too. :(
 

Thread Starter

W123

Joined Apr 27, 2011
4
I do have the schematic. Ampeg was nice enough to glue one on the inside when it was made. All it says is F-10 by the diode. Bah. I havent actually pulled it off the board yet. The front is worn off, maybe the back side of it has enough left to tell. If its got pieces of numbers that match the ones around it then Ill just use those and pray. Its kinda a oneshot on the schematic so there arent any identical sections to say "Hey theyre doing the same thing here, its probably the same one!"

Thanks.
 

marshallf3

Joined Jul 26, 2010
2,358
I still think sending them an e-mail is the best procedure. If it turns out to be a zener or something in the bias circuitry of the amp you could blow the whole thing up just guessing on the diode.
 
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