[Amps] 1N Diodes

[Bruce]

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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