Hello; I was wondering if you provide me with some advice as to which replacement power transformer would be most suitable for this radio, preferably one from AES. This is a Silvertone model R-1261, chassis 100-351, and the transformer is horizontally oriented, 6 volt CT filament, 5 volt Rectifier, but I am unsure which High voltage to use. The set uses: 5Y3, 25C6, 6Q7, 6K8, and (2) 6U7's. The Schematics call for 300V filter caps. but I'd like to base my decision on a little more scientific reasoning. Thanks for helping out one more time.

: Hello; I was wondering if you provide me with some advice as to which replacement power transformer would be most suitable for this radio, preferably one from AES. This is a Silvertone model R-1261, chassis 100-351, and the transformer is horizontally oriented, 6 volt CT filament, 5 volt Rectifier, but I am unsure which High voltage to use. The set uses: 5Y3, 25C6, 6Q7, 6K8, and (2) 6U7's. The Schematics call for 300V filter caps. but I'd like to base my decision on a little more scientific reasoning. Thanks for helping out one more time.

Hi,
Well, there are a number of them that should work acceptably, the biggest issue is if you have space for a transformer that is oriented vertically, or if you find that objectionable.

You are looking at about 100ma B current rating; based on design center value plate currents. AES part "P-T263AX" might work okay. It has a 100 volt B voltage rating, but should work, the filter caps would bring the b voltage a little bit above the 100VAC to center tap rating.

The 25C6 would be out of place, as it appears the original power transformer used a 25 volt winding for the filaments, and a combination of parallel/series connections for the other tube filaments; but a 6Y6 (gt/g) has the same performance ratings, and would allow all of the filaments to be wired in parallel, and thus able to utilize the 6.3 volt winding. Concievably, you "could" make it function without the replcaement of the transformer, but it would be a lot of work, because it would end up being a variation of the "All American Five" transfomerless set-up; but has the advantage of not requiring the old transformer to be removed from the chassis- providing you have the room for the newly added capacitors.

Either way you choose to do it, there will be some re-wiring involved.