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Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only.

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Old 16th Aug 2022, 10:05 am   #21
ms660
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Default Re: Bush VHF61 - magic eye not closing.

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Originally Posted by Vectis68 View Post
The grid voltage has increased from 0.5mv to 2.1mv when tuned to a station.

The cathode voltage has increased slightly from 4.8v to 5.0v when tuned.
There shouldn't be any cathode voltage to speak of WRT chassis/ground because the cathode should be connected to chassis/ground.

What's the DC voltage WRT Chassis/ground at test point "A" in the schematic when tuned to a decent FM signal ?

Lawrence.
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Old 16th Aug 2022, 8:12 pm   #22
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Default Re: Bush VHF61 - magic eye not closing.

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There shouldn't be any cathode voltage to speak of WRT chassis/ground because the cathode should be connected to chassis/ground.
Absolutely!! The cathode should be at chassis potential. Make sure it is the cathode you are measuring (pin 2) counting clockwise from the gap. If it is pin 2, try connecting a piece of wire between pin 2 and chassis. It could be nothing more simple than a high resistance earth tag causing all the trouble.
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Old 17th Aug 2022, 8:49 am   #23
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Default Re: Bush VHF61 - magic eye not closing.

I reckon that's meant to be the anode voltage.

Lawrence.
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Old 17th Aug 2022, 4:25 pm   #24
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Default Re: Bush VHF61 - magic eye not closing.

Apologies for not commenting sooner, I am currently unable to boot my laptop and so I've had to reset my password so I can login here on my phone.

Quote:
I reckon that's meant to be the anode voltage.

Lawrence.
You are correct, that is the anode voltage. My mistake.

Phil.
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