[TenTec] Delta II intermittent RX (VCO issue?)

[Al Gulseth]

My recently acquired (from an estate) Delta II/536 exibits intermittent 
operation on the 14.5 - 21.5 MHz range (VCO 3) and has also gone dead once 
briefly on the < 7.5 MHz range (VCO 1.) The SK's son informed me of 15M etc. 
intermittent operation when I bought it, and in looking at the manual I'm 
wondering if a VCO alignment is what is needed. (The other VCO ranges seem to 
function correctly when this is happening, thus my focus on VCO 3.)

Has anyone run across this type of issue on a 535/536, and if so, what was the 
solution - alignment, or something else?

TNX/73, Al