03-01-2014, 07:07 PM
(This post was last modified: 03-01-2014, 07:11 PM by Robert Darwent.)
I've also got this thread running on UKVRR and someone suggested that the extra valve may be due to problems sourcing the EBL31 valve usually fitted in the A22. Then I noticed in the images that the valve in position V3, where the EBL31 usually sits, is too small in diameter to be an EBL31.
I now believe Ekco, for whatever reason, substituted the EBL31 in some of the chassis for say an EBC33 and an EL33. If correct the valve line-up would have been: ECH35, EF39, EBC33, EL33, AZ31
The A22 was released just after the end of WWII and possibly valve shortages at the time forced the production of a limited number of chassis with the fifth valve. I know for certain Ekco did the same sort of thing with the AD75 round Ekco which can be found with a chassis having either a CBL31 or Pen453DD output valve and/or side-contact valve substitutes in some of the other valve positions.
Regards
I now believe Ekco, for whatever reason, substituted the EBL31 in some of the chassis for say an EBC33 and an EL33. If correct the valve line-up would have been: ECH35, EF39, EBC33, EL33, AZ31
The A22 was released just after the end of WWII and possibly valve shortages at the time forced the production of a limited number of chassis with the fifth valve. I know for certain Ekco did the same sort of thing with the AD75 round Ekco which can be found with a chassis having either a CBL31 or Pen453DD output valve and/or side-contact valve substitutes in some of the other valve positions.
Regards
