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post #91 of 97

2/21/13 at 5:35am

arnyk
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Quote:

Originally Posted by andyc56

For solid-state power amps, the parallel R-L network has been the standard solution for over forty years.

I presume you are referring to L702 and RT34 in the schematic above, just to the right of center in the drawing above (HK Citation 12). Notice that there is also a Zobel which is less common:

The following is the schematic of the output stage of an Onkyo TX-809 AVR which shows the series insertion of a similar parallel R/L circuit R5411 and L5424 in center-right.

post #92 of 97

2/21/13 at 5:40am

arnyk
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Quote:

Originally Posted by Ivan Beaver

Of course the old joke comes to mind.

If an amp cannot drive a normal load it is either broken---OR---an audiophile amp.

The word "Naim" comes to mind. I believe that some of their amps are only guaranteed to be stable if you use their brand of speaker cable.

post #93 of 97

2/21/13 at 5:53am

JD in NJ
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Quote:

Originally Posted by Ugly1

Isn't there some kind of radio solution in this day and age that could be used to get a signal out to a plate amp on the loudspeaker and thus eliminate long spaker cable runs?

Yes, of course. Outlaw has such a system available and probably others do as well.

post #94 of 97

2/21/13 at 6:28am

markrubin
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posts deleted

please do not quote or respond in to a problematic post

post #95 of 97

2/21/13 at 5:50pm

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Quote:

Originally Posted by andyc56

Hmm, not sure what your objection to what I'm saying is. Here's what I was trying to address:

Hi Andy. I think you are doing a fine job explaining things. it is just my own quote I don't like. I probably should have had a smiley in my post to you. Cheers.

post #96 of 97

2/21/13 at 6:06pm

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Okay, I've gone back to the previous page and edited or deleted some quotes.

post #97 of 97

2/21/13 at 6:17pm

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Quote:

Originally Posted by arnyk

Quote:

Originally Posted by andyc56

For solid-state power amps, the parallel R-L network has been the standard solution for over forty years.

[Image removed from quote by Andy]

I presume you are referring to L702 and RT34 in the schematic above, just to the right of center in the drawing above (HK Citation 12). Notice that there is also a Zobel which is less common:

The following is the schematic of the output stage of an Onkyo TX-809 AVR which shows the series insertion of a similar parallel R/L circuit R5411 and L5424 in center-right.

[Image removed from quote by Andy]

Yes, that's it. I've also seen the Zobel on the amp side of the inductor too. Dr. Leach in his amp from the 70s put it on the speaker side, actually right across the banana jack terminals at the amp's output. Apparently he had problems with the amp oscillating if it was on the amp side, located on the PCB. I've spoken to someone, I can't remember who, who had the same oscillation problem with the Zobel on the amp side on the PCB, and fixed it by giving the Zobel its own separate return back to the star point from the PCB (isolating it from the main signal ground on the PCB).