GP1250 diode equivalent

[set4d]

Hi, new to the forum so please be gentle 

I've got an amp on my bench that's come in for repair. I've found a blown GP1250 diode but can't for the life of me find a UK supplier for a replacement. Can anyone suggest an equivalent replacement please or, better still, a UK supplier?

Many thanks,

Rich

[Pete66]

I think you will have to buy in bulk:
https://www.ebay.com/itm/ROLL-OF-4561-NEW-OLD-STOCK-DEC-DIOTEC-SOFT-GLASS-DIODES-GP1250-T-R/333382714072?hash=item4d9f2882d8:g:6JcAAOSwsbhdvITY:sc:FedExHomeDelivery!60633!US!-1

Maybe ask the seller if they can sell you a few.

What is the function of the diode in the circuit?  Is it part of a bridge? Does it really need to be 2500V Reverse voltage?

[Audiorepair]

Looking at the Forward Voltage figures in the datasheet, this device looks like a string of diodes in series in one package.

You may be able to replace with several single diodes in series.

https://www.digchip.com/datasheets/parts/datasheet/131/GP1250-pdf.php



I'm guessing this diode is on the OPT of a valve amp?

[Audiorepair]

Well, we know nothing of the circuit that this diode comes from, but I have seen this diode used on valve amplifier OPT's, and can be got from Farnell.

It is 4kV.


https://uk.farnell.com/vishay/gp02-40-e3-54/rectifier-std-0-25a-4kv-do-204al/dp/2335149

[set4d]

Thanks for this. Yes, It's from a guitar amp.

[Pete66]

The Vishay diode is 4kv but he forward current is half of the GP1250. 

[Audiorepair]

We still don't know what this diode is doing.

If it is catching back EMF spikes, it is reversed biassed, no forward current.