I wanted to thank everyone for all of their help and the information was also very valuable. I decided to just replace the filter caps and clean up all the places where they leaked and just reused the original transformer. I also decided to socket the op amp to try a few different ones as well. The amp has never sounded better, no more crackling pots or input jacks and all is well with the world.

I am contemplating not selling it now or maybe modding it a bit.

Thanks again all!!

OK, with no load across the secondary legs it is 29.36VAC and to the center tap 14.66VAC on each one of the legs. Having a hard time locating a power transformer with those specs.

No load would mean nothing connected to the output of the secondaries? I do have a Fluke that can read AC, DC and Amperage

I was kind of leery about the 50W transformer they were suggesting.

One last question. How does one determine the VA rating of a power transformer when replacing one?

Thanks for the help

I am in need of a replacement power transformer for a Marshall Lead 12 3005 amp. The current one looks like it was leaking something or had something spilled on it and looks like it is corroded. It in the schematic here http://www.drtube.com/schematics/marshall/3005.gif and Marshall has told me the direct replacement is a Dagnall B1PTB63015 which can be found here: http://www.gretschparts.com/products/1724/Marshall-Transformer-Power-50-watt.htm

I would prefer something that is well made like Mercury Magnetics, but they say they do not have anything that will work. I am not even sure what specs I need to give to a manufacturer when querying them about transformers. Any help would be appreciated.

The filter caps on this thing are also shot and am looking for good replacements there as well.

Thanks