16-06-2020, 09:18 AM
(This post was last modified: 16-06-2020, 09:20 AM by Mike Watterson.)
It seems like quite ordinary wire, not litz. The aerial loop scheme does sound like the early 5214 family.
The friction drive was replaced by cord drive in production maybe 1944, I'm not sure. Production during 1942 to 1944 seems to have been a mix of P8 and octal in any position. Later production may have used imported RCA or Sylvania valves, sometimes labelled as Mullard. The family of valves was released originally by Sylvania. Philips/Mullard fitted P8 bases and Mazda fitted the Mazda Octal base. Sets using the Mazda base seem to have switched over to octal quite early in WWII. The Ever Ready branded valves are all Philips/Mullard, though a few 1930s Lissen/ER mains models used Mazda types.
So, yes the octal bases were retro fitted, likely between 1943 and 1947 as we think all production was P8 for 1939 to 1941 and maybe most of 1942.
Replacing the main VC seems unlikely. There are padding trimmers on the chassis I think. I'll go look.
You mean the minimum tuning cap value?
The friction drive was replaced by cord drive in production maybe 1944, I'm not sure. Production during 1942 to 1944 seems to have been a mix of P8 and octal in any position. Later production may have used imported RCA or Sylvania valves, sometimes labelled as Mullard. The family of valves was released originally by Sylvania. Philips/Mullard fitted P8 bases and Mazda fitted the Mazda Octal base. Sets using the Mazda base seem to have switched over to octal quite early in WWII. The Ever Ready branded valves are all Philips/Mullard, though a few 1930s Lissen/ER mains models used Mazda types.
So, yes the octal bases were retro fitted, likely between 1943 and 1947 as we think all production was P8 for 1939 to 1941 and maybe most of 1942.
Replacing the main VC seems unlikely. There are padding trimmers on the chassis I think. I'll go look.
You mean the minimum tuning cap value?
