IME--Some Tube IF Strips are outstanding. Some not so good.
The Bush TV125 B/W from late 50's early 60's has a dual-standard 405/625 line IF Strip full of EF80's/6BX6 but the set was let down in my opinion by having a tube UHF Tuner.
--Bung a later type good quality Transistor Tuner in one was a match made in heaven, I swear I could get reception from Scotland if the antenna was right!
Consumer grade Tube gear and UHF if not done well,--well-there you go!..
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