Apologies if this post belongs elsewhere, i just figured that high voltage transformers were of particular interest when building valve amplifiers.
A whole bunch of the same power transformer seem to have hit the surplus market. Like this listing:
New Rib Functional Devices Transformer TR50VA018 T 249 | eBay
It's an industrial control transformer with 120v secondary and COM-208-240-277-480 primary winding.
Or, looked at another way, 120v primary and 240-32-0-37-240 secondary winding.
A little weird that the extra winding is asymmetrical but it could still be useful for bias voltages?
In backstrapped use the voltage might be slightly lower due to the nature of industrial control transformer specifications.
All windings have color coded wire leads. The end bells have the 120v winding sticking out the top and the rest sticking out the bottom, which has a flange for a standard 2-gang electrical box. There is enough space between the windings and the outer core to comfortably tuck the 120v leads to the bottom side.
Mine arrived fairly quickly with some minor bending to the flange and a busted conduit fitting on top. Brand new in box. I haven't load tested it yet - probably saturday.
Anyway, I figured it could be useful for a line stage, headphone amp, small guitar amp, etc. Provided you have filament transformers knocking around already, which i do.
Right now there are in excess of 100 of them on epay.
A whole bunch of the same power transformer seem to have hit the surplus market. Like this listing:
New Rib Functional Devices Transformer TR50VA018 T 249 | eBay
It's an industrial control transformer with 120v secondary and COM-208-240-277-480 primary winding.
Or, looked at another way, 120v primary and 240-32-0-37-240 secondary winding.
A little weird that the extra winding is asymmetrical but it could still be useful for bias voltages?
In backstrapped use the voltage might be slightly lower due to the nature of industrial control transformer specifications.
All windings have color coded wire leads. The end bells have the 120v winding sticking out the top and the rest sticking out the bottom, which has a flange for a standard 2-gang electrical box. There is enough space between the windings and the outer core to comfortably tuck the 120v leads to the bottom side.
Mine arrived fairly quickly with some minor bending to the flange and a busted conduit fitting on top. Brand new in box. I haven't load tested it yet - probably saturday.
Anyway, I figured it could be useful for a line stage, headphone amp, small guitar amp, etc. Provided you have filament transformers knocking around already, which i do.
Right now there are in excess of 100 of them on epay.
