15-06-2020, 04:18 PM
(This post was last modified: 15-06-2020, 04:19 PM by Mike Watterson.)
If it's really octal then it's probably 1942 or later.
Which way does the knob move the pointer? Early versions use a friction drive (pointer contra-rotates) and later they changed to a cord and spindle the same as the Model A. The Model A seems very similar or identical to the late version 5214.
Also some pre-1942 models later had the valve bases changed in service shops as the edge P8 were unavailable by 1943 or 1944. The P8 and octal types in some cases are identical, just the base. The pin order is the same. There are later versions of the octal type that are usually shorter.
I have the 1939 Lissen version of the ER 5214 (only cosmetic differences) as well as real Model A. Both are working with my replica AD3 pack (loads of AA and D to give same run time as original, as Alkaline D is maybe better than Zinc F, and Alkaline AA is similar capacity to the B cells. All most all HT packs not using layer cells used "B" size cells as in the 4.5V flat torch battery still sold. Some 6V packs use D cells and some still use F cells.
At some stage during wartime production they changed the loop aerials from the 1939 version to the same as was used in the Model A.
VC = Variable Capacitor or what?
Do you mean the LW & MW loops and 3rd loop for an external aerial?
Do upload photos of the loop arrangement and the external aerial socket so I know which version it is.
I'll see about measuring mine in the next day or two.
Note that the holes in the rear panel cunningly allow tuning / alignment, which is affected by the battery pack. Make a replica with at least 4 x D cells and 60 x AA cells to get a similar effect.
The early version may have one aerial loop on the rear panel and later all the loops are in the main case. I'll have to check. I can certainly measure inductances and give an idea of the wire used on the 1939 and 1945-1946 model.
The factories were destroyed in the "Blitz" in 1941. After this there was practically only production of the Forces / Comfort 5214 model (most in plain colour according to service). It's not clear if some of the last mains models listed were ever produced. Some later Forces models had SW instead of LW, as UK LW was shut down during WWII. Production moved to a temporary site before finally moving to Block A in I think Wolverhampton, which was the main radio production and service centre till ER gave up radios. Though there were two later periods when they imported. I'm sceptical that the Model A was any more than a cost reduced case version of the last variation of the Forces/Comfort set.
Which way does the knob move the pointer? Early versions use a friction drive (pointer contra-rotates) and later they changed to a cord and spindle the same as the Model A. The Model A seems very similar or identical to the late version 5214.
Also some pre-1942 models later had the valve bases changed in service shops as the edge P8 were unavailable by 1943 or 1944. The P8 and octal types in some cases are identical, just the base. The pin order is the same. There are later versions of the octal type that are usually shorter.
I have the 1939 Lissen version of the ER 5214 (only cosmetic differences) as well as real Model A. Both are working with my replica AD3 pack (loads of AA and D to give same run time as original, as Alkaline D is maybe better than Zinc F, and Alkaline AA is similar capacity to the B cells. All most all HT packs not using layer cells used "B" size cells as in the 4.5V flat torch battery still sold. Some 6V packs use D cells and some still use F cells.
At some stage during wartime production they changed the loop aerials from the 1939 version to the same as was used in the Model A.
VC = Variable Capacitor or what?
Do you mean the LW & MW loops and 3rd loop for an external aerial?
Do upload photos of the loop arrangement and the external aerial socket so I know which version it is.
I'll see about measuring mine in the next day or two.
Note that the holes in the rear panel cunningly allow tuning / alignment, which is affected by the battery pack. Make a replica with at least 4 x D cells and 60 x AA cells to get a similar effect.
The early version may have one aerial loop on the rear panel and later all the loops are in the main case. I'll have to check. I can certainly measure inductances and give an idea of the wire used on the 1939 and 1945-1946 model.
The factories were destroyed in the "Blitz" in 1941. After this there was practically only production of the Forces / Comfort 5214 model (most in plain colour according to service). It's not clear if some of the last mains models listed were ever produced. Some later Forces models had SW instead of LW, as UK LW was shut down during WWII. Production moved to a temporary site before finally moving to Block A in I think Wolverhampton, which was the main radio production and service centre till ER gave up radios. Though there were two later periods when they imported. I'm sceptical that the Model A was any more than a cost reduced case version of the last variation of the Forces/Comfort set.
