Gerry O’HaraThanks Bruce and Ed. I think what I have here is a modified R7 chassis – that socket marked ‘AVC 27’ sounds very similar to what you found on your chassis Ed, though either the mod was partly reversed, or was never completed. The two 45s in the output stage of the chassis I have here definitely rule out the R7A chassis (the R7A has 47s in their place). Of course AVC would not have worked properly anyway with 24As installed in the chassis in place of 35s. I found the chassis layout diagram in Riders (photo attached, along with underside view of the chassis I have). There seems to be some other mods as well – note the large green resistor hanging off the resistor board near the tuning gang. I will report back when I have taken a closer look to see if there were any changes made to the grid circuits of the RF and IF amps for AVC control, and what that large green bodied resistor is doing…. what a ‘rats nest’ of a chassis.
