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RE: Photos?




The photos Interstage Tranny provided contain a pleasant surprise. The power transformer seems fairly substantial. Somebody allowed for the "standing" DC 1/2 wave rectification places on a power trafo and that DC causes considerable stress in the part.

It seems that buying a new trafo might not be necessary. A voltage doubler B+ supply energized by the trafo in situ looks possible.

I've uploaded the venerable RCA circuit. Other than changing R1 to 24,000 Ω (a value not available back in the day), you could use that circuit as shown. If you want to feed a recording device or long cables, a buffer will be needed.

Save the genuine Mullard tubes for another job. Notice that RCA called for the 7025, which is a 12AX7 that contains a spiral wound, hum bucking, heater. The Sovtek 12AX7LPS is a genuine 7025 equivalent. LPS stands for long plate spiral. ;>)


Eli D.

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