[R-390] Low IF gain problem

[Philip B Atchley]

Hello All.
Yesterday I mentioned that I thought the R-390A I'm working on seemed to
have low gain, though it was hearing weak ones ok (It "hears" my sig
generator, AM modulated 50% at it's lowest setting of -127dBM just fine).
 However I mentioned I thought the IF gain seemed low as indicated on the
S meter, so I checked it by inserting 150uV at 455kHz into J513 and tried
setting the gain control for -7VDC at the diode load jack (per the
manual).  The highest I can set this for is 5.0VDC and with gain about
halfway (where I set previous receivers) it reads 2.9VDC in ALL bandwidth
settings.

Question.  Does the Lankford AGC mod affect gain any in this IF strip,
perhaps by loading it down (2 diodes across a couple resistors)?  I've
tried subbing tubes. 

If I can get the IF gain up this receiver will be working just fine (did
a pareliminary alignment already).

I may have to finish recapping don's IF so I can sub it for
troubleshooting purposes.

73 de Phil  KO6BB
Loving home provided for wayward Boatanchor Receivers
ko6bb@juno.com
Merced, Central California
37.18N  120.29W  CM97sh

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