tony sayer wrote:

Arny Krueger writes
"Eeyore" wrote in

In my case my I was comparing the H-H TPA 50 amplifier (
a fairly classic A/B design of its era and quite widely
used in pro-audio - including the BBC ) with ~ 0.1% THD
on the spec sheet with a friend's recently assembled kit
ampliifer using Crimson Elektrik modules. These used a
rather more 'state of the art' design with the then new
high speed Japanese output devices ( the H-H used
Motorola darlingtons ).

Lets just say the difference wasn't subtle !

The H-H sounded gritty by comparison to the much smoother
Crimson.

I had to search high and low to find much out about H-H brand equipment.
Apparently they were popular in the late 70s. I wouldn't try to generalize
very much related to just one sample of such an ancient obscure piece.


I recall them and they did sound very rough. But they were mainly used
for PA and such applications......

Many were indeed used in rock PAs simply because they were few British high
power amplifiers of that era but far from exclusively. There was even a special
BBC version of the TPA25.

" There's also a photo of one of the many AIR studio consoles, in their Oxford
Street control rooms. I was interested in the rack of power amplifiers that you
can see to the right of the console. These silver faced units were HH
Electronic TPA100 power amps and what looks like three smaller TPA25 amps at
the bottom of the rack. "

http://www.auroraaudio.net/cgi-bin/d...m=DCForum ID1

Graham