[Heath] HL-2200 amp problem

[Terry Perdue]

Sandy,

I'll drop a few NOS 1N191s in the mail for you tomorrow.

73, Terry K8TP

On 1/22/2014 9:30 AM, pmarkavage at juno.com wrote:
> Obviously, the first thing to do is check the diode so see if it's 
> bad. A 1N34 or NTE109 should work fine as a replacement.
> Pete, wa2cwa
> On Tue, 21 Jan 2014 22:15:15 -0500 "Alexander N. Gerli" 
> <ac1wye at gmail.com <mailto:ac1wye at gmail.com>> writes:
>
>     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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