[Heath] HL-2200 amp problem

[Dave Edwards]

Does the diode forward/reverse ok??
I don't know what the likelihood of a diode's conductivity 
characteristics being ok...yest still be shot. Perhaps someone else on
the list can comment.
There are a few on ebay, but too pricey.
I'll bet there are HUNDREDS in ham's parts bins.
If you determine that is truly the culprit...I would put a few 
"wanted's" out, here and on the homebrew section
of eham.net

....Dave



On 1/21/2014 10:15 PM, Alexander N. Gerli wrote:
> 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.
>
>
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