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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