Transformer wiring?

[rick riner]

I have a Marshall AS50R that was given to me, its like new, but its wired for 220 and I need to make it 110, the transformer #TD63089F0 seems to be a common one but cant find any info on how to switch to 110. Wires coming off the transformer into a circuit board (4) so it can be changed but don't know which way to change it. HELP!!!

[Jazz P Bass]

Welcome to the Forum, Rick.

As far as can be told from the schematic, the power transformer Primary is NOT center tapped.

Therefore you cannot physically alter the winding arrangement.

So you need the 110V input tranny (Marshall or aftermarket) or a suitable step up transformer. (110 t0 220Vac)

AS50R power transformer wiring.pdf

[Mick Bailey]

Can you post a pic of the connections? I'm interested to compare what you have with the schematic.

[Mike Hugs]

230Volt connections

I am new to the forum so if I have broken any conventions my apologies. I have an AS50D in for repair with one of the primary windings open circuit. The transformer is the same part no as for the 50R version so they must be almost the same amp. The primary windings seem to have 3 taps does anyone know what the taps are. Blue to brown according to the label on the amp is 230Volt but what blue to white or blue to black are I don't know. Since my transformer has an OC Blue to the brown, I might put it on a Variac and see. I know the Secondary DC voltages are approx 31volts plus/minus so I should be able to figure it out.

[The Dude]

Welcome, Mike!

I'll preface by saying this is guessing. I couldn't find any documentation. My thought is that there are two primary windings used series for 220V and parallel for 120V. It might be easy enough to verify that with some measurements. You might take the time to put your location in your profile. We don't know if you are looking for a 220V or 120V solution- depending on what part of the world you're in.