[Elecraft] [K3] PR6 to RCV ANT - BNC Connectors

[N3XX]

Hi all,

I'm using a PR6 preamp (switched on by DIGOUT1 from the ACC connector when 
I'm on 6 mtrs) connected to the K3 receive antenna connectors with a pair of 
male-male BNC connectors.  I have been having a problem with audio levels 
dropping as much as 15 dB (as seen on WSJT Specjt window).  This is always 
corrected by unplugging the male-male BNC connectors from the receive 
antenna connectors on the K3 and plugging back in again.  I'm hoping the 
problem is just the male-male BNC connectors I'm using to connect the PR6, 
and not the connectors on the K3.  Has anyone else seen this problem, and 
have you found a good brand of male-male BNC connectors that corrected the 
problem?  If you have been able to correct this problem with good male-male 
BNCs, what brand are they, and where did you get them?

Thanks for any info.

73,
Tim - N3XX