[Amps] SB-220 diode failure

[Gary Smith]

My .02 on this:
I would update the 220 with the Harbach rectifier mod.  Have heard 
nothing but praise for his mods to the point he is sometimes overwhelmed 
with orders for them.  To me, that speaks well enough.
73
Gary...wa6fgi


John Adkins wrote:
> My sb220 cooked one of the diodes on the pc board a couple of days ago.  I replaced the faulty one
> with a 1kv piv 2.5 amp substitute that was in my junk box.  Resoldered the wires back to the pc
> board, reassembled it, and fired it up.  When I went to tune the amp up, with no exciter power, I
> get a plate current of 200 ma instead of the 120 ma the manual indicates should be seen.
> 
> HV is 2.2 kv on low power, 2.8 kv on ssb.
> 
> The manual suggests that the zener may be blown.
> 
> What do you think?  Should I just get the Harbach rectifier/metering board substitute for the
> original pc board and eliminate the zener altogether?  Other suggestions for troubleshooting this?
> 
> Thanks
> 
> John
> w4kv
> 
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