Specifications

http://www.ppwatt.com
Tweed 5E3 PCB Valve Junior Conversion
Build Manual v3.0 13 Feb 2011
33 of 40
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This shows the wire colours of the MPS OT15PP output transformer. The red is
the B+ lead (T8) & the brown are the 8K leads. The blue wires are the 7K taps.
Other OTs are likely to have different coloured wires.
The MPS OT20PP 8K tap is brown & blue & the 6.6K tap is white & grey.
8K is the recommended impedance, but you may prefer the sound from the lower
impedance WDSV,WZRQ¶WKXUWWKH27RUWXEHVDWWKHORZHUYDOXH You could
put them on a switch. Just make sure not to flick the switch with the amp on full
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Twist the brown wires as shown & slide
the newly soldered spade connectors
onto the Tweed 5E3 PCB spade
connectors as shown.
Insulate & tie off the blue OT wires out of
the way.