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More Diode Substitution Info [message #21622]

Fri, 03 October 2014 09:40

Jerrybass1955
Messages: 45
Registered: August 2014
Location: NC

Member

Hi Folks,

I'm having a bit of a struggle with 1/2 of the power section of my K100-pre-rev-3 and I am starting to suspect perhaps an issue with the bias diodes. They check out as diodes in-circuit, but it is looking like time to pull them and check them out. So a few questions:

1) My diodes CR104 and CR105 are in metal cans with a diode symbol on them. One leg is connected to the cathode (if I remember correctly). Is this consistent with a 1N3139 as you guys are familiar with?
2) If not, what are they?
3) If so, does anyone know what a good sub would be other than the NTE sub?
4) The same NTE116 is a general purpose diode that appears to sub for some of the 1N4000 series like 1N4003-1N4007?

In similar circuits I have seen, such bias diodes appear to just be general purpose diodes (as is the NTE116). I have some 1N4007s (specs seem similar except for max Vf), and I may need to try them unless someone has a better suggestion or can add to the common knowledge to expand the table below. But if it indeed isn't the diodes, I don't want to make other problems or make finding the problem even harder.

Looks like we know the following:

007-6004-00 / FD111 / nte177 / 1N4148/ Silicon Diode
007-6005-00 / 1N3193 / nte116 / Silicon Diode
007-6006-00 / 1N3754 / nte5801 / Silicon Diode
007-6016-00 / Silicon Diode
007-6020-00 / 1N270 / nte109 / Germanium Diode
007-5349-00 / 1N5349 /nte5127A / 12v 5w Zener Diode

Any help appreciated. I will likely post about the power amp problem soon for more opinions. Currently driving me crazy (more of a putt than a drive in my case).
Jerry

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