[Boatanchors] 51J-4 question

[WA5CAB at cs.com]

Larry,

Maybe you have one of the elusive R-388A's that have been rumoured to exist 
but no one ever admitted to having one.

However, if the subassembly with the three mechanical filters attached has 
two tubes and is mounted behind the dial drum up against the PTO, I probably 
have the Instruction Book covering at least that part of the modification.  And 
the tubes are 6BA6, not 6BE6 (which is a converter tube, not an amplifier).

In a message dated 5/13/2005 12:08:17 AM Central Daylight Time, 
bwils at bellsouth.net writes: 
> >I recently picked up a Collins 51J-4 from a friend to use and decide if
> >i want to buy it or not.
> >
> >First of all, it's not a true 51J-4 per my friend.  He said it's an
> >R-388 that was upgraded by the Air Force to 51J-4 specs.  They added a
> >product detector on the right side, mounted on a bracket to the support
> >panel that goes from the front panel to the chassis.  I don't know what
> >other changes might have been incorporated but it also has 3 filters,
> >.5, 3.0 and 6.0 Kc.
> >
> >The chassis is marked with the tube V and type numbers.  The IF tubes
> >are 6BE6.  I would not have expected that to be the correct tube but
> >that's what is marked on the chassis and plugged into the socket.
> >
> >Not having any 388 information, do these tubes in the IF section sound
> >like a 388 or what?  These 3 are pretty flat and of all the boxes of
> >tubes i have, i don't have any of these.  Yet!

Robert Downs - Houston
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