"Dave" wrote in message
news:TmYbh.13231$hn.5733@edtnps82...

"Eeyore" wrote in message
...


Dave wrote:

"Arfa Daily" wrote in message

Now there's your problem with a DC coupled amp ...

why do you think it's a DC coupled amp? All I see in the description is
"Kenwood".

It would have to be pretty ancient to be AC coupled.

Graham


Are pretty much all modern amps DC coupled, then, as opposed to
capacitance coupled? My solid state amps are from the golden era
high-powered SS audio, mid-70's to early 80's and both amps and my preamp
have capacitor-coupled inputs.


Well, that pretty much says it. From the late 80s on, I think that just
about everythingof half way decent quality that's been made, has been DC
coupled throughout. It produces a far flatter overall frequency response.
Anyway, we're not talking just the inputs here, which may indeed still be AC
coupled even on a modern amp. We're talking all interstage coupling, and
indeed inter-element within stages here. The reason that this gives a big
headache to service engineers, is because of the huge gains involved. A
signal of a few mV on the input, will finish up as potentially several tens
of volts at the output. Thus, a small offset at the front end of such an
amp, which may not even have caused any noticeable problem with AC coupling,
will result in the outputs slamming hard over one way, followed rapidly by
their demise ...

Arfa