[R-390] 26Z5W replacement

[Barry]

Tim,

Thanks for the link!  I think the one I had is the same article in PDF
format.  I need to print this one just in case I need to use it.

Barry - N4BUQ

----- Original Message ----- 
From: "Tim Shoppa" <tshoppa at wmata.com>
To: <r-390 at mailman.qth.net>
Sent: Friday, October 21, 2005 9:26 AM
Subject: Re: [R-390] 26Z5W replacement


> Has anyone tried rewiring the rectifier scoket and
> using another rectifier tube in its place instead of
> going solid state and wiring in a resistor?

Somewhere on the net is descirbed how to use 12BW4's
in place of 26Z5W's.  You have to put the filaments in series
instead of parallel.  12BW4's are readily available.

Ah, here it is:

  http://www.mines.uidaho.edu/~glowbugs/r390_psmod.htm

Looking in the mailing list archives it is reported that the 12BW4
has slightly higher plate resistance than the stock 26Z5W's.

Tim.
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