This is aimed specifically at those who have designed/built tube amps with separate tube rectified PSUs.
One scenario I'm envisioning would involve the PT and rectifier in the same chassis, so that the full wave rectified, unregulated HV, along with the 6.3Vct filament supply would run through the umbilical.
My first question is would it be better to also do the HV regulation in the PSU box so that the regulated HVDC is carried by the umbilical, along with the 6.3vct AC voltage to the amp chassis? And if so, will there be any undesirable induction of noise from the 6.3vac into the DC line? I'm talking about 360-380 VDC @ 200 mA, and about 4 amps for the 6.3 vac.
Then are there any general tips on the construction and geometry for the umbilical -- shielding, grounding, braiding, etc.?
And does anybody have any recommendations for connectors?
I'm seriously considering building my ST-35 clone with an outboard tube rectified PSU which will allow me to use a smaller chassis for the amp, plus the usual benefits of keeping the PT and AC line noise far from the amplification section.
I did a rough layout with my custom electraprint PT, an octal socket for the 5AR4, the PC board for the amp itself, and the two OPTs, and I would need something like an 11" x 17" chassis to get all this into, and that's with little clearance between PTs and OPTs, and a generally less than optimum internal layout.
Anybody know how Modwright and Mapletree do theirs?
Thanks,
Jim
