[Amps] HV rectifier diodes

[Joe]

How about equalizing resistors?

Joe WB9SBD
Sig
The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com
On 1/27/2019 2:28 PM, Mark Schoonover wrote:
> Art,
>
> Take a look at 1N5408 diodes. I'm using these in a desktop kilowatt
> project. If they'll work for you send me sase and I'll send you what you
> need. I got a deal on a bulk purchase.
>
> 73! Mark KA6WKE
>
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> On Sun, Jan 27, 2019, 10:28 Art <ky1k at myfairpoint.net wrote:
>
>> Hi All,
>>
>> When I joined the list, it was to get the skinny on solid state amps,
>> little did I realize that my tube type amp would die and I'd be
>> consulting the list for HV diode suggestions and vendors.
>>
>> But:
>>
>> I have a bottom end amp, 400 watts out, an AL84. The plate voltage
>> dropped from just under 1kV (unloaded) to 600v and obviously the power
>> output is way down. I assume I need new rectifiers.
>>
>> The manual says it uses 1kV @ 3 amp diodes, 8 of them total, in a full
>> wave bridge rectifier configuration. The part number is AR-145, which
>> isn't available, it's likely an Ameritron house number. The voltage
>> rating of each diode seems marginal to me though (to me).
>>
>> I looked in Digikey and Mouser, they don't don't carry them.
>>
>> There are no equalizing caps or resistors, so I'd prefer to put in a
>> single 4kV diode rather than deal with 2 diodes in each leg of the
>> bridge. Barring that, I'd like to replace all 8 diodes with 2kV @ 2 amp
>> diodes.
>>
>> Are there any reputable vendors that sell these lower voltage diodes at
>> a reasonable price, I would prefer NOT to use the online auction site::>
>>
>> Would appreciate any comments or suggestions.
>>
>> TY
>>
>> Art
>>
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