Robert,
Many thanks for the background on the EL35, which is very interesting.
I’ve never seen the datasheet with the EL5 and the EL35 and thought it was introduced in 1945 after the 6L6 – this is as per the info on The Valve Museum
www.r-type.org site as in post #15 above.
The EL35 data I went by can be found in the data sheet below and also in the Mullard early maintenance manual:
https://frank.pocnet.net/sheets/084/e/EL36_Mullard.pdf
Looking at the EL5 and the EL35 datasheet, Robert directed me to and also the later EL35 data I had sight of; maybe Mullard – as GEC did with the KT66 – reintroduced or remarketed the EL35 valve in 1945 with higher electrode voltages to appeal to the 6L6 users?
Sadly, as I previously said, using EL35's is all quite hypothetical as the examples I have here are a motley ‘ole crew and I’d need to find good one to match the good one I have here. I’m not going to shell out for a good one based on the ridiculous prices I’m currently seeing!
Terry.