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In Reply to: Here's a classic ...... posted by drummerwill on February 23, 2007 at 17:05:19:
just curious, . Do these amps hum with all those DHTs in the chain (SE -> PP pair) and (I presume) A/C heating ?
Follow Ups:
These are really interesting amps, I've completely rebuilt 2 of them.
Yes all DHT, but the (2) type 30's and the first 45 are DC heated.
The IT is a real quality IT. I replaced the OPT"s with Electra-Prints. They run Class B and can do near 8 watts and sound pretty good.
I also have a 661 I completely gutted and made a 417A IT coupled PP45 Stereo amp,one of my favorites.
Willie,How was the DC filament supply obtained? Was a Copper oxide rectifier used?
With DC on the small signal filaments and cancellation in the PP O/P trafo, hum should not be a problem in that amp.
Eli D.
The DC is derived from the B+ and resistors. Simple and quite
affective! For a 1936 all DHT amp tube amp, they are pretty quiet!
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