Valvestate 80V choke replacement

[KarverPT]

Hi everyone,

I own a Valvestate 80V (model 8080) combo which I haven't used for many years, as it developed a no sound problem on the dirty channel.

Today, I examined it with a technician friend and we found out that the choke autotransformer (marked as ATX1 on the board and schematic) is open. This would be part T5899 as referenced in the schematic, T-5899 as referenced on the choke itself. Would you know where I can find a replacement part?

Thank you!

 

[Dogs of Doom]

this one?

Marshall Transformer for ECC83 supply in Valvestate 8080 etc.

Transformer for the high voltage supply of the ECC83 in Marshall Valvestate 8040, 8080, 8100 (ATX1) replaces T5899

www.tubeampdoctor.com

 

[Dogs of Doom]

&... to the forum...

 

[KarverPT]

this one?

It seems so, I'll check it out. Thank you!

 

[Dogs of Doom]

you're welcome, glad I could help!

Good luck!

 

[KarverPT]

you're welcome, glad I could help!

Good luck!

Yes, you did, and I checked it out. But the shipping costs would be almost as much as the transformer itself, so... still looking.

 

[Dogs of Doom]

well, the only other one I see is in Spain, vs Germany...

probably costs about the same...

Marshall Transformer for ECC83 supply in Valvestate

Marshall Transformer T589 for the high voltage supply of the ECC83 in Valvestate .

www.retroamplis.com

 

[KarverPT]

well, the only other one I see is in Sweden, vs Germany...

probably costs about the same...

Yes, that's the one, I found it too and was about to post about it. Shipping costs are VERY different, actually (different carriers). Many thanks for the welcoming message and for all your help!

 

[johan.b]

It isn't a real transformer. It is Open... it works more like an ignition coil. One winding around the core with a low voltage tap. And the same winding going on up to high voltage.
J

 

[KarverPT]

It isn't a real transformer. It is Open... it works more like an ignition coil. One winding around the core with a low voltage tap. And the same winding going on up to high voltage.
J

Hi Johan,

You are correct in your description, that arrangement is called an autotransformer as there is a single coil for both input and output voltages, meaning also that there is no isolation between primary and secondary circuits unlike what happens on a normal transformer. In the amp, it is used to raise the voltage going to the plates (anodes) of the ECC83, and being a choke it should also be filtering out unwanted high frequencies.