Corrupted PT

[Oddvar R]

Seems like my Dumble 50w PT is gone to transformer heaven. When I disconnect all secondaries, the fuse still blows? Even as high as 5A.

Is the a recommendation for a new on? 240v?

[bepone]

if no any load on secondaries, and is blowing the fuses.. you can start searching replacement..

[Richard1001]

This factory shut down, but some left over transformers are still sold.

http://www.triodeelectronics.com/40-18097.html

[Oddvar R]

Great tip, but the shipping cost is around 120 dollars, a bit expensive?

[Richard1001]

The shipping cost will depend on where in the world you live. For my SSS i bought allmost all parts and transformers in the USA. Somehow where i live, it is very hard if not impossible to find quality parts. When i buy cheap transformers and parts i may save a little money, but i have to look and listen to it for years. Over time quality is more important to me than the money payed.

[bepone]

you can wound any trafo in local winding ship for 60usd..so no need to order and pay 3 times if expensive

[Roe]

try tube town

[Oddvar R]

Could anyone verify if the enclosed specs for an Edcore PT be appropriate for a Dumble 50w?

Primary (input) Voltage 100Vrms, 50/60Hz. or 120Vrms, 60Hz. (Except 2450v)
Secondary (output) Voltage 720V/55V bias(360-55-0-360)@300mA, 6.3V(3.15-0-3.15)@5A, & 5V@4A

[larsvictor]

Hello Oddvar,

since it seems that your location is Europe you might have a look at this polish supplier:
https://amptone.pl/p/273/2443/power-tra ... rmers.html
This one has more or less Dumble ODS 50W specs. It has an extra 12VAC secondary for the relays.

Lars

[Oddvar R]

A good tip. Ever since Classictone went out of business, transformers seem hard to come by?

[Lothy]

A good tip. Ever since Classictone went out of business, transformers seem hard to come by?

Why not using Hammond transformers? I have standard Twin Reverb transformers (290FEX PT) in my build and I'm very happy with the result. For 50w use the 290EEX.
https://www.hammfg.com/files/parts/pdf/290EEX.pdf

Cheers
Gerhard

[Oddvar R]

A good tip. Ever since Classictone went out of business, transformers seem hard to come by?

Why not using Hammond transformers? I have standard Twin Reverb transformers (290FEX PT) in my build and I'm very happy with the result. For 50w use the 290EEX.
https://www.hammfg.com/files/parts/pdf/290EEX.pdf

Cheers
Gerhard

Hi Gerhard.

I totally agree with you, I have used Hammonds in many of my builds, but trying new ones, maybe get a different sound, being able to state what differences are, that's part of the fun, isn't it?

[norburybrook]

A good tip. Ever since Classictone went out of business, transformers seem hard to come by?

Why not using Hammond transformers? I have standard Twin Reverb transformers (290FEX PT) in my build and I'm very happy with the result. For 50w use the 290EEX.
https://www.hammfg.com/files/parts/pdf/290EEX.pdf

Cheers
Gerhard

I used those in my first ever #102 build and it's still going strong and has been a fantastic amp


M

[professormudd]

A good tip. Ever since Classictone went out of business, transformers seem hard to come by?

Why not using Hammond transformers? I have standard Twin Reverb transformers (290FEX PT) in my build and I'm very happy with the result. For 50w use the 290EEX.
https://www.hammfg.com/files/parts/pdf/290EEX.pdf

Cheers
Gerhard

I used those in my first ever #102 build and it's still going strong and has been a fantastic amp


M

I have also used Hammonds in several builds, including that 290FEX in a 124 and a 183. They are just fine and dandy as far as I am concerned.

[neskor]

Just pay attention some Hammond power transformer from 2xx family gets hot