[Boatanchors] R-390A receivers and Q Multipliers?

[Philip Atchley]

Hello.
Tomorrow a friend of mine is bringing me a Heathkit HD11 Q Multiplier that
he bought me at the Turlock auction (I asked him to bid on it for me).

I have a very specific use for this critter.  I use my LF modified R-390A to
chase weak longwave beacons and VERY frequently there are very strong
carriers within the IF passband (but out of the passpand of my Audio
Filters) that desense the receiver due to the AGC action (I often disable
the AGC when that happens).  I Use the .1kc IF bandwidth but the slopes
aren't steep enough to eliminate the strong adjacent carriers and I "hope"
that the Q multiplier will allow me to "Null" said carriers when I wish to.

QUESTION 1:  Has anyone here used a Q multiplier on an R-390A receiver?
Results?

QUESTION 2:  I know you usually connect the Q multiplier to the Mixer tube
plate or the plate of an IF amplifier (I've used them on other receivers).
So as to NOT disturb the Crystal and Mechanical filter circuits this pretty
much leaves the plates of the 2nd IF tube (or later in the circuit).
Suggestions for the 'Best' connection point in the receiver AND the best way
to bring this connection out of the set without drilling a lot of holes and
messing up the "value" of said receiver??

73 de Phil  KO6BB

Loving home provided for wayward Boatanchor Receivers.
Military R-390A '67 EAC  (26 'valves').
Hallicrafters  SX-71 ('53) & 5R10A ('53).
Realistic  DX-160 ('78).
HOMEBREW  Longwave CW receiver.
Merced, Central California,
37.18N  120.29W  CM97sh.