[R-390] Tube List For R-390 (non A)

[Norman Ryan]

Glen Galati wrote:
> 
> Something looks fishy on this tube list.  Is there a model of the R-390 that
> used the 26Z5W V801& V802? I don't have my manuals here-but my R-390 does
> not have any.
> Glen Galati         KA7BOJ


Hi, Glen,

Grrreat Caesar's ghost!  I think you may have the L@@K!! PEEEEK!! RARE!!
non-tube power supply in your R-390!

OK, maybe not...

All seriousness aside, your power supply may have been modified to solid
state rectification.  I think this is a common Navy mod involving taking
out the 26Z5Ws and squishing the tube shield bases so you can't stick
the tubes back in.  Then a pair of diodes is installed underneath.

My latest rig (actually an R-391) came with diodes and I took them out. 
B+ goes high unless a voltage dropping resistor is added.  Voltage
regulator circuits work a little less hard at normal B+ voltage as
well.  I feel the tubes don't like to have B+ introduced before their
filaments even start to glow.  

True or not, having 26Z5Ws back in there makes me feel better.  :-)

73 de Norman KG4SWM