03-01-2014, 05:09 PM
(This post was last modified: 03-01-2014, 05:11 PM by Robert Darwent.)
(03-01-2014, 04:35 PM)ed731pdh Wrote: Some early sets had an extra valve as a preamp for fringe areas, might be the reason why.
Are you referring to early A22's or early sets in general?
With regards the A22, a pre-amp would seem unlikely. The signal flow on the chassis goes from RF at bottom right then anticlockwise to the output valve. The component strip follows in a similar fashion around the edge of the chassis.
The extra valve is located after the normal output valve so quite a length of screened cable would be needed to feed the signal back to the lower right if it was a pre-amp - no evidence of that and it would make the set prone to instability/hum.
Regards
