In article ,
Scott Dorsey wrote:
I have generally designed 70v systems for high quality audio to have a
-3 dB point around 20 Hz, which requires pretty huge transformers. I
strongly recommend the Tannoy transformers (which are actually made by
some company in Canada for them) but the cheap Edcors aren't bad if you
buy their "extended low frequency" series. For background music systems
there's no need to have anything that extreme.
Are those Tannoy transformers wound by Hammond in Ontario?
Hammond's own line is at
http://www.hammondmfg.com/117.htm. The top of
their line talks about low frequency cutoff at 50 Hz. at full power.
I think Mouser now carries the Hammond line. Prices, last I looked, are
not too bad, considering that they're about the only quality house
still winding some of the old-spec stuff for vacuum tube iron.
Hank