[Phil Allison[_3_]]

"liquidator"
"Phil Allison"
"liquidator"

He's also wrong. all he needs to do is add transformers. Done it a
hundred times.

** Really ?? Not with domestic amps like Technics.

Such amps are never intended to drive 70 volt line ( step up)
transformers are very likely to be damaged by so doing.

The issue is core saturation at low frequencies - hard to avoid
completely and deadly on anything but the most rugged amplifiers.


Interesting. Have done it dozens of times. Tend not to use Technics, and
do use quality transformers.

What about a coupling capacitor or would that be a bad idea?

** An electro cap of about 1000uF ( a back to back pair is needed ) will at
least eliminate any DC offset issues with the very low primary resistance of
the line tranny - but adds the risk of creating a low frequency series
resonance effects which can be even more deadly to the amp.


You are the one whose judgement I respect, perhapsI have just been lucky.

** You must have been extraordinarily lucky.

It is reckless to connect a domestic or even most pro audio amp's output
direct to a line voltage tranny - amp makers regularly warn against it.
Generally, the amp requires modification and a network is placed between the
amp and the tranny to limit current flow to a safe value if core saturation
or overload occurs.

QSC amps are particularly vulnerable to damage when used this way - seen 4
of them ( USA850s ) destroyed on the same day the install was done.



...... Phil