Re: Grampian type 531 Amplifier
The OP transformer I am using is a Partridge 9428. It says that on the transformer. It's rated at 75W and is physically too big, so when I finally sort the amp out I will look for another transformer. I originally replaced the two 5U4G rectifiers with 127's many years ago to mount the transformer onto chassis, but have decided now to put things as were.
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