Traynor guitarmate reverb YGM-3 power transformer replacement.

[Chemtooler]

I picked up a cosmetically challenged 1971? Traynor ygm-3. (The version with the three input jacks) It has been spray painted, the baffle board was hacked up for a 15 inch speaker, and there is almost none of the print is left on the faceplate. Right now the biggest issue is that it is missing the power transformer.
I did a little research and I believe the a Hammond 290TRB is the correct replacement.
However, I found a few sources that suggest using a Hammond 270DAX to lower the plate values for modern AC voltage and EL-84 tubes. (http://leightonamplifiers.blogspot.c...well-that.html)
My home AC voltage is 123V

I have to buy a transformer, so I just wanted to get some opinions about which way to go.
Specs:
https://www.hammfg.com/files/parts/pdf/290TRB.pdf

https://www.hammfg.com/files/parts/pdf/270DAX.pdf

I found these decals for the faceplate but I would welcome any other suggestions

https://www.radiodaze.com/generic-gu...tem-dcl-gamp1/


Thank you to all for your advice.

[g1]

I also like the 270DAX specs better. But it has a bit smaller footprint, so if the 290TRB is an exact fit, you will have to drill some holes to use the 270.

[bsco]

ah ha..I have that amp here that I had bought brand new in the 70's.... did you try Yorkville for a transformer?? they still make some of these vintage amps as re-issues...call Yorkville....1-905-837-8550...ext 236....

[Randall]

That is a great sounding little amp. I used to use one for reggae band practice in the 90's. The bass player never would sell it to me.

[Chemtooler]

Thank you for your rely G1, I think I try the 270DAX. I might need some help figuring out how to use the center tap as was mentioned in the link I posted. I am assuming two diodes are removed to set up a full wave rectifier, but I do not completely understand hooking it up.

Randall- I am looking forward to hearing it when it is done. If I get too over my head it will likely end up on your bench.

[Helmholtz]

I might need some help figuring out how to use the center tap as was mentioned in the link I posted. I am assuming two diodes are removed to set up a full wave rectifier, but I do not completely understand hooking it up..

If your amp corresponds to the schematic you posted, there are only 2 rectifier diodes and the replacement PT is connected just like the original one.

[Chemtooler]

Thank you Helmholtz, you are correct that is not the correct schematic. The diodes in this one are arranged like the first schematic in this link. Dated 11/73
https://www.thetubestore.com/lib/the...-Schematic.pdf

[g1]

The link in post #1 was about a 1978 version? He is talking about a bridge rectifier that your amp does not have.

[Chemtooler]

Here is a picture of the power section

[g1]

Sorry, I didn't see right off that there was a multi-page schematic.
Your amp power section uses the full wave rectifier with the center-tap going to the standby switch.
The unit described in the link you posted had a bridge rectifier like the 1998 re-issue. (see attached)