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i'm on a roll... the kgsshv


kevin gilmore

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"Now if somebody can spot my way of dealing with the 10M90 sinks with only metric screws at hand... laugh.png"

That's what I did.

I later thought I could have drilled a hole and tapped it M3 a little higher up the heatsink, but thought the loss of mounting surface on the device would be overly compromised.

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When I test the 4686 transistors I get an unexpected reading using my DMM and only with the transistors in the middle (red arrows, and on both boards):

Collector to emitter: 0.75 V

On the rest of the 4686's: OL

Both base-collector and collector-emitter conduct one way only as expected.

Why do I get those readings only with the middle ones and not the rest? both boards?

At first I thought they were damaged but its to much of a coincidence with the same ones on both boards.

post-2299-0-77334700-1331103611_thumb.jp

post-2299-0-16257900-1331103626_thumb.jp

post-2299-0-02952600-1331103641_thumb.jp

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I suppose because theyre prettier, and that several companies have made it seem like the Vishay/Dale name automatically makes things better.

"So what if theyre only rated for a 500v maximum? Theyre cool!!!"

Why are people using CMF60 resistors for the bias ballast? Doesn't anybody read the bloody spec sheets?

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