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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

mf x-p100 power supply
mf x-p100 power supply
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Old 19th February 2014, 08:50 AM   #1
Old'n'Cranky is offline Old'n'Cranky  Australia
diyAudio Member
Join Date: Aug 2009
Default mf x-p100 power supply

Hi all.

I've got a musical fidelity x-p100 pre amp here to fix.

Fault - primary winding on the toroidal power supply has gone open circuit.
Issue - unmarked transformer, nothing at all.

So, is anyone willing to share what the output windings are on this beast ?
or the voltages on the 5 pin plug/socket.

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Old 19th February 2014, 10:31 PM   #2
Old'n'Cranky is offline Old'n'Cranky  Australia
diyAudio Member
Join Date: Aug 2009
Ok, never mind.
Opened the preamp and found the voltages marked on the circuit board.

For future reference;
transformer is ~ 20watts, and is potted into the lower half of the power supply case with potting resin, so unless you really want to, it'd be easier to replace the entire assembly with a new case etc.

71 - 0 - 71
0 - 11

pin1 71vac
pin2 0vac
pin3 71vac

pin4 0vac
pin5 11vac

interesting side note, the preamp circuit board is set out to accept the nu-vista tubes.
in the tubes place are ztx transistors.
so without digging to far, looks like it could be a pretty easy mod to turn a x-p100 into a nu-vista pre..........
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