[sdiy] Diode voltage drop

Tom Arnold xyzzy at sysabend.org
Mon Aug 1 19:36:03 CEST 2005


On Mon, Aug 01, 2005 at 08:54:35AM -0700, Harry Bissell Jr wrote:
> The diodes are usually attached to the heatsink and
> form a part of temperature controlled biasing. You
> could try a generic (iN400x) but sometimes these are
> special components and using the wrong one can cause
> thermal runaway.
> 
> If they are NOT on the heatsink, I'd try the generics.
> 
> If they are, I'd try to find exact matches

They arnt on the heatsink, they are in the feedback loop of Finals ->
Drivers and are part of the circuit that causes the amp to "gracefully
distort" when Q4's current is equal to that in the bleeder resistors.

I did finally find some good matches.  GR10D's had a curve that matched
nicely.

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