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Old 13th Apr 2021, 8:52 pm   #18
Techman
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Join Date: Nov 2009
Location: Lincolnshire, UK.
Posts: 4,985
Default Re: Bush VHF61 FM band dead.

I've just removed the ECC85 from a VHF61 and replaced it with an ECC88 and it's been running without any flashes or crackles for the last ten minutes - I did leave the valve 'hat' off when I first switched on to be able to see any possible flashovers from within the valve. I've now put the valve hat back on and screwed up the back cover, so we'll run the radio for a few days (not overnight, obviously) and see what happens. I think there was a slight tuning difference between the two valves, but it was only very slight.

It might be worth putting an ECC88 on the bench with small crock clips on the appropriate pins while on a heater and variable HT supply and wind up the HT until it sparks, that'll prove things once and for all.

There's some very interesting things coming out regarding possible tuner faults on the VHF61, particularly the previous post.
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