[Amps] 1N Diodes

[k9mk at flash.net]

Greetings to the Group,

    IMHO bigger is usually better.  I may have missed it in the threads here, but I also look at the "peak" current for the part.  This usually tracks the forward current rating but plays a factor in recharging the filter caps each cycle where the currents can well exceed an amp, or two or three.  Although some may scoff, I found some 6-amp 1KV diodes, most likely from China that work quite well in over a dozen amplifier rebuilds with notable less HV sag at max output.

YMMV

Mike K9MK  

-----Original Message-----
From: Amps <amps-bounces at contesting.com> On Behalf Of Kim Elmore
Sent: Wednesday, June 30, 2021 9:09 AM
To: amps at contesting.com
Subject: Re: [Amps] 1N Diodes

I think the forward drop is the essentially the same for both diodes. 
Unless the circuit depends on the diode breaking down when reverse biased, I don;t know why there would be any difference. My guess is that the 1N4001s were a wee bit cheaper than the 1N4007 whenever MFJ bought the lot. That said I'm more than happy to be educated!

Kim N5OP

On 6/30/2021 8:50 AM, Mark - N5OT wrote:
> So I put it in and the meters work like they're supposed to.  Just 
> worried if it affects the overload circuit. However, the amp is 
> running very acceptably.  25ma of Grid current at 1500 watts out.
>
> On 6/30/2021 7:34 AM, Mark - N5OT wrote:
>> Ameritron AL800H - two 3CX800s
>>
>> Meters have always behaved badly.  Manual says when this happens, 
>> then D117 may be shorted.  I have the amp opened, and this diode 
>> tests shorted.
>>
>> Manual says this diode "protects the overload circuit and the meters."
>>
>> It's a 1N4001.  I can't find any around here.  I have about 1x10E18
>> 1N4003 diodes.  Can I use a 1N4003?
>>
>> Thanks in advance.
>>
>> 73 - Mark N5OT
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--
Kim Elmore, Ph

Kim Elmore, Ph.D. (Adj. Assoc. Prof., OU School of Meteorology, CCM, PP SEL/MEL/Glider, UAS, N5OP, 2nd Class Radiotelegraph, GROL)

/“I occasionally play works by contemporary composers and for two reasons. First to discourage the composer from writing any more and secondly to remind myself how much I appreciate Beethoven." – Jascha Heifetz/

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