The behavior of my T-4X with plate current dip normally and load properly on
80 & 40 but not on higher bands ended up being the 6JB6 tubes. My T-4XB
worked fine on all bands, so first I installed the final tubes from the T-4X
into the T-4XB. When I did that, the T-4XB behaved as the T-4X had, no dip
on 20, 15, & 10. These final tubes were RCA tubes, and suspiciously clean
externally. Then installed the dusty Sylvania tubes, with "35" written on
the outside of each from the T-4XB into the T-4X, whereupon the T-4X plate
current dipped and could load the transmitter on all bands. The
neutralization seems on-the-money as well. So, now the T-4X works
perfectly, the T-4XB is "sick".
I await receipt of two "NOS" 6JB6 tubes to see how well they will work in
the T-4XB, am not sure what brand they will be. Wish knew a source for
"known good" 6JB6 tubes, would buy a few for spares.
73, Curt
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