Peavey Classic 30 II 2018

[Helmholtz]

It is most probably a thermal fuse - not a thermistor.

[Enzo]

Agree, thermal fuse, and the temp is in centigrade, not Fahrenheit.

[Oldmactech]

Yes, it is Centegrade, don’t see too well.

.

[Oldmactech]

Do I dare jumper it and see if I get anything thing to cone on?

[g1]

For test purposes yes you can jumper it. You should still have all the secondaries disconnected though.

[Oldmactech]

Not finding the exact fuse at Mouser or Digi-key. Should I buy a coffee maker at Goodwill and scavenge one?
kidding....

[g1]

Did you look for other close temperatures?

[Oldmactech]

I’m assuming 2-3 degrees (higher) would be insignificant but not finding any 1A. Every thing I see is 10A. Is that not goi g to work?

I think I see 145 C but 10A but will that work?

[g1]

I don't see how it could be 1A, the mains fuse is bigger than that isn't it? Maybe it is a 10A thermal cutout?

[Oldmactech]

I believe the main fuse is indeed 10amp but the marking on the fuse is 1A.
i ordered a couple of 145 degree 1A fuses. As close as I could come...


What would happen with a 10Amp fuse if the temp rating was close to 134 degrees?

[The Dude]

The part number looks to be EYP1BF134. Sadly, the only place I could find it was eBay and from China.

https://www.ebay.com/itm/5Pcs-Panaso...YAAOSwEy1eBhNU

[Oldmactech]

I ordered a couple of these as they are close in spec. Please advise me as to the downside of increasing the temp by 10 degrees or so?

Thanks for your order, we're on it

Thank you for ordering from Newark. We are currently processing your order.

Your reference number is: 10/22/20 22.36 PM

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Order Details

Newark Ref: 10/22/20 22.36 PM Date of Order: Oct 22, 2020

90R8618 4 EYP-1BF145 PANASONIC EYP-1BF145 Fuse, Thermal Cutoff, 1 A, 250 V, 145 °C, Axial Leaded, 125 °C

Billing Method: Credit/Debit Card Shipping Method: Newark Flat Rate (Over $150 USD Ships Free) (Order by 9:30 PM EST)

[Oldmactech]

This is Digikey replacement for the obsolete part. 128dgrees C

Digi-Key Part Number	317-1133-ND
Manufacturer	Cantherm
Manufacturer Product Number	SDF DF128S
Supplier	Cantherm
Description	TCO 250VAC 10A 128C (262F) AXIAL
Manufacturer Standard Lead Time	7 Weeks
Detailed Description	Thermal Cutoff (TCO) AC DC 128°C (262°F) Axial
Customer Reference

[g1]

When I asked about the mains fuse, I meant the AC fuse in the fuseholder. It has to be small enough that it will blow before the thermal fuse in the transformer.
That's why I figured it can not be a 1A rated thermal. Then it is going to blow before the AC fuse. There would be no point in having an AC mains fuse then.
So the Digikey 10A makes sense to me.

[Oldmactech]

Thanks, I think I get it.
i pulled the main fuse and it’s a 5A, the casing says 10a so I guess I should have looked closer.
I think you are saying a 1A fuse will blow before a 5A which makes the 5A sorta useless in protecting the transformer?