[Heath] HL-2200 amp problem

[Alexander N. Gerli]

Hi, everyone,

My HL-2200 is running fine except for one small thing: the Relative Power
positions on the Meter switch don't read.

I've checked the parts in the chain, and I'll bet the 1N191 Germanium diode
is shot. All the other parts in the resistive divider chain check out, both
at the output SO-239 terminal strip and also on the terminal strip below
the multimeter.
Gotta be that diode.

Problem is...1N191s aren't available any more, and they're Germanium which
makes them a bit fragile for reverse voltage peaks. The '191 has a PRV of
90V which seems awfully low, even given the 68K ohm 2W sampling resistor
ahead of it going to the SO-239.

What to do? Does anyone on the List have any suggestions for a good
substitute which is readily available? I have some 1N270s, but they're
Silicon and perhaps not as sensitive as those Germaniums. Seems to me that
I should use a diode with a PRV of more than just 90V!

Thanks for your help, as always!


73,  Sandy AC1Y


Alexander N. Gerli, Sr.
548 Allred Mill Road
Mount Airy, NC 27030-2202

Scotsmen walk about 900 miles each year.
A Scotsman drinks around 45 gallons of Whisky a year.
Scotsmen get about 20 Miles Per Gallon.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://puck.nether.net/pipermail/heath/attachments/20140121/95cefdc7/attachment.html>