The 1N5408 is a good replacement that I have used for years to repair
other hams amplifier. In fact I replaced one in a AL811H just last week
and have many other amplifiers in the past. It is rated at 1,000 PIV
(Peak inverse voltage) with current rating of 3 amp. I buy them by the
bulk and never had a replaced one fail as of yet. FT8 and other digital
modes caused a lot of heat in your amplifier.
73, Bruce, W8HW
===========================
On 7/1/2021 5:29 AM, Boye Christensen via Amps wrote:
Hi To All
There is 3 reasons for a shorted 1N4001
To high reverse voltage
To high Current
To high temperature then degraded lifetime
And all 3 will be better with 1N5408
Alek has has a good point here, upgrade to a 3 Amp diode 1N5408
73 Boye OZ7C
On 01-07-2021 02:08, Alek Petkovic wrote:
NO!. Leave the higher voltage rated diode/s in there. Don't go
backwards and risk it failng again.
As Lou said, be safe and stick 1N5408s in there. They do NOT affect
any thing else in the amp. They just have a much higher rating and
safety factor.
73, Alek, VK6APK
On 30/06/2021 11:31 pm, Mark - N5OT wrote:
Thanks everyone,
I think I will leave the 1N4003 in there for the time being, but
when I find a 1N4001 I'll set it aside for the next time I open the
box.
73 - Mark N5OT
On 6/30/2021 9:26 AM, Dan Michnay wrote:
I ran into trouble replacing a 4002 with a 4007 some years ago. It
was in a switching power supply. The reverse recovery time
increases significantly as you go from the 4001 to the 4007. I
don't know if that is significant in your application but it is true
Dan K9EA
On 6/30/2021 9:50 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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