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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc.

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Old 21st Feb 2018, 7:45 pm   #21
jayceebee's Avatar
Join Date: Jun 2007
Location: Durham, County Durham, UK.
Posts: 219
Default Re: Marconi 4816 1590 survivor!

Originally Posted by Heatercathodeshort View Post
The chassis is interesting, almost a cross between the 980 and a 1500.
And the 960 also, note the capacitor dropper for the heaters.

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Old 21st Feb 2018, 9:01 pm   #22
Heatercathodeshort's Avatar
Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 5,956
Default Re: Marconi 4816 1590 survivor!

It's a pity that very high quality capacitors were not available years earlier. That would have eliminated the troublesome mains dropper but would have reduced the income of service engineers. I loved droppers!

As I have mentioned before. The main reason for tube failure was down to the preset LT supply pot. It was rated at 220ohm but would creep up in value to over 2k resulting in a 15v rail before hum instigated a service call. By then it was too late. I used to fit a ceramic high quality pot. Problem solved. John.
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