[Johnson] Slightly off topic question concerning mercury vapor rectifiers

[Joe Yamond]

Thnaks to all who replied  with their input on those
816's I really appreciate the responses. Luckily I
didnt take out the transformer, probably only the
tubes. I do love that cool blue glow but if I get
tired of it I may swap for SS repl. 
Thanks again and 73,
Joe N2OUV 
--- Joe Yamond <bbc39668@yahoo.com> wrote:
> Hello,
> This is slightly off topic but I'm sure many of you
> on
> the list can assist me. I am restoring an old 813
> transmitter and power supply built from QST in the
> 50's. I am having toruble with the power supply and
> am
> wondering if I may have done some thing wrong, the
> supply uses 2 816 MVR tubes and I had heard that
> these
> tube filiments need to warm up completely before the
> high voltage is turned on. Is there any truth to
> this?
> Before found that out I was testing the power supply
> and was turning on both the filiment power and HV
> power and noticed the tubes would glow very brightly
> and make some noise and then settle down to a
> lighter
> blue glow. Voltage output was good but then the
> supply
> started blowng fuses on the HV side. With the tubes
> removed the fuse doesnt blow. Also during testing
> the
> tubes were horizontal could this have caused them to
> fail? And lastly is there a good source for
> replacements of the 816s or are those solid state
> replacements better.
> Thanks in advance the help.
> joe
> 
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