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So, got a Marshall Artist 3203 with a fried power transformer.
All secondary windings shorted, but not to each other.
Ordered a replacement from Mojo, everything works as it should but the PT has a typical buzz even with the secondaries disconnected and the buzz is even heard from a speaker even with no tubes in, standby on, and even when I disconnected all the secondaries.
It was getting warm when connected and running fine, which caused me some alarm.
Nothing is drawing more current than normal, I checked all the secondary connections, filament draw normal, HV draw normal.
No spec for the LV winding but it's not drawing much current either.
What is a bit odd is the -15v rail measures like 1M to ground while the +15v rail is only 2K ohms.
But that is still only 7.5ma.
I replaced the LV filter caps just to make sure.
So am I being paranoid about the PT being warm and WTF can I do about the physical buzz?
Maybe try some better mounting/insulators or plastic washers.
Relevant technical info:
All secondary windings shorted, but not to each other.
Ordered a replacement from Mojo, everything works as it should but the PT has a typical buzz even with the secondaries disconnected and the buzz is even heard from a speaker even with no tubes in, standby on, and even when I disconnected all the secondaries.
It was getting warm when connected and running fine, which caused me some alarm.
Nothing is drawing more current than normal, I checked all the secondary connections, filament draw normal, HV draw normal.
No spec for the LV winding but it's not drawing much current either.
What is a bit odd is the -15v rail measures like 1M to ground while the +15v rail is only 2K ohms.
But that is still only 7.5ma.
I replaced the LV filter caps just to make sure.
So am I being paranoid about the PT being warm and WTF can I do about the physical buzz?
Maybe try some better mounting/insulators or plastic washers.
Relevant technical info:
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