Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Default Warwick Sonic III amp

Not the cause of the problem that it is here for repair, but I cannot return
it to the owner with this glaring potential (in both senses) fault,
presumably the same for all such Warwick amps.
One large heatsink with +75V on it and the other at -75V and 2.5mm between
the two , both mounted on standard polyester pcb with chassis standoffs well
away from the heatsinks. Discharged both before this test of course,
requires only 1.5Kg of force between the 2 heatsinks to narrow the gap to
1.5mm.
Have amp designers never seen the internals of their stuff
resonating/oscillating mounted in or on speaker cabs, especially bass amps
such as this?

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Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
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Default Warwick Sonic III amp


"Meat Plow" wrote in message
...
On Sun, 15 Mar 2009 14:04:12 -0000, "N_Cook" wrote:

Not the cause of the problem that it is here for repair, but I cannot
return
it to the owner with this glaring potential (in both senses) fault,
presumably the same for all such Warwick amps.
One large heatsink with +75V on it and the other at -75V and 2.5mm between
the two , both mounted on standard polyester pcb with chassis standoffs
well
away from the heatsinks. Discharged both before this test of course,
requires only 1.5Kg of force between the 2 heatsinks to narrow the gap to
1.5mm.
Have amp designers never seen the internals of their stuff
resonating/oscillating mounted in or on speaker cabs, especially bass amps
such as this?


Ran into similar design phenomena in a Berringer Euro Power powered
mixer. Left me sitting scratching my noggin wondering what the hell
were they thinking.


Well Meat, you answered your own question there ! It was a Behringer, so
they weren't thinking at all ... !! d;~}

Arfa


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Default Warwick Sonic III amp

Meat Plow wrote:

Ran into similar design phenomena in a Berringer Euro Power powered
mixer. Left me sitting scratching my noggin wondering what the hell
were they thinking.


Well Meat, you answered your own question there ! It was a Behringer, so
they weren't thinking at all ... !! d;~}

Arfa


Heh I don't even know how to spell the damn name. I won't work on that
crap unless it's store stock. However I was mildly impressed
(sonically) with the BX4500 amp. I won't look inside, that will no
doubt spoil things.


Makes me want to resurrect my old Harmon Kardon A500 tube amp with its
ambiance knob set high!
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