[Amps] HV rectifier diodes

[Boye Christensen]

Hi

I did replace in my SB220 think it was in before 2000

1 Amp diodes 1N4007 with 3 Amp diodes 1N5408 1/2 $ a pice

They are still working !

73 Boye OZ7C


On 26/01/2019 20:38, Art 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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