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Old 8th Aug 2022, 10:25 pm   #8
Vectis68
Triode
 
Join Date: Jul 2022
Location: Plymouth, Devon, UK.
Posts: 10
Default Re: Bush VHF61 - magic eye not closing.

I've tried changing the EF89(x2) and the EABC80 valves - no improvement (purchased as NOS tested)

I'm not using the sets internal aerial as I have it out of it's cabinet. I don't have access to a proper external aerial at the moment, so I am use two pieces of enamelled wire, approximately 76cms each for the aerial.
I don't believe I am in a poor reception area, I'm in the city of Plymouth and the nearest transmitter is in Plympton (about 5 - 7 miles away)

I've taken some voltage readings from the EM81, as follows:

Pin 1 (grid) when tuned to a station

VHF = -0.5mv
MW = -2.2v

Pin 2 (cathode)

VHF and MW both at -0.2mv

Pin 7 when tuned to a station

VHF = 4.8v
MW = 75v

Pin 9

VHF 177v
MW 185v

Phil.
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