[Boatanchors] 51J4 schematic

[Robert Downs]

First, an R-388 is a 51J3.  Apparently, the R-388A is a 51J4.  But all that
I have on the R-388A/URR is the conversion instructions from R-388/URR,
which are how to install the three mechanical filters, switch, etc.

I don't have anything that would shed light on the tube complement change.
I have a few copies left of a Collins 520 5014 00 dated 15 August 1954 on
the 51J4 that I made 20+ years ago.  But their foldout schematic shows
6BE6's for the Mixers and 6AK5 for the RF.  If you want to fool with it, I
could send you a copy of the schematic and you can check the component
values around the mixers and RF amp.  If different, I can edit the schematic
and print the edited version.  I guess that we would need to try to figure
out what to call it.

Robert Downs


-----Original Message-----
From: boatanchors-bounces at mailman.qth.net
[mailto:boatanchors-bounces at mailman.qth.net] On Behalf Of
bill.riches at verizon.net
Sent: Sunday, June 10, 2018 12:35 PM
To: boatanchors at mailman.qth.net
Subject: [Boatanchors] 51J4 schematic

.  I picked up a clean 51J4 that I rebuilt for myself and it is working
fine.  I would like to find the correct schematic for it.  It is using 6BA7s
for the mixers rather than 6BE6s and a 6BZ6 for the RF amp instead of the
6AK5.  The correct tube numbers are marked on the chassis.  I checked with
Howard and he said he never saw an R-388 or 51J4 like mine.  The only 6ba7s
that I have seen have been in a 75A3.  Any ideas?  

 

73,

 

Bill, WA2DVU

Cape May

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