VintageKustom.com: Replacement Part Suggestions

Re: 1N4007 diode [message #28238 is a reply to message #28236]

Wed, 02 June 2021 08:35

stevem
Messages: 4733
Registered: June 2004
Location: NY

Senior Member

Well it may work ok, the question is how much the needed mica insulator will effect heat transfer and then number two what is the cold resistance of the chosen transistor ?

Here's what I have found from just testing the cold resistance of several diodes I have.
Seven 1N1007 of the same brand tested anywhere from a low of 643k up to 4.8 meg, with most of those seven testing above 4.3 meg
Next I tested four UF5804 diodes and they ranged from 450 to 602k.

I tested two 1N5625 diodes ( ball type) they where 718k and 3.8 meg.

A original 1N3754 in one of my K100s checks in at 5.6 meg.

So what do we consider average?
How much effect does such a wide range of cold resistance have on the bias voltage ?

I wish I had like 15 to 20 1N3754s to test out and then average that out!

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