In article ,
Norman M. Schwartz wrote:

Those amps failed when it came to driving speakers with impedance less than
8 ohms, and since those were the only speakers which I was attracted to,
they proved to be useless. I understand that modern tubes amps can drive
such loads effortlessly, but their maintenance is too much of a PIA for me.

Curious; never had problems driving a double pair of KLH Nines with 4
slightly modified Dyna MK III's, and if my old GR 650A was to be believed
the Nines had an impedance of about 1/2 ohm, almost all capacitative, at
20Khz.

I much preferred the D75N to the D76, but never took the time to figure
out why.

On the other hand the Nines did sound much better being driven with the
dB Systems DB-6, and long-term operation was a lot cheaper since even then
matched pairs of 6550A's were not cheap.

Mike Squires
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Mike Squires (mikes at cs.indiana.edu) 317 233 9456 (w) 812 333 6564 (h)
mikes at siralan.org 546 N Park Ridge Rd., Bloomington, IN 47408