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Heatercathodeshort · 17th Oct 2020, 2:14 pm

Check it across C87 1000uf or the collector of VT21, the regulator transistor on the heatsink for 11.6v. Check the value of the adjust pot. It should be 220 ohms. If it has risen replace it with a good quality type such as a ceramic. J.

17th Oct 2020, 2:14 pm	#2
Heatercathodeshort Dekatron Join Date: Jun 2005 Location: Warnham, West Sussex. 10 miles south of DORKING. Posts: 9,147	Re: Thorn 1590 set HT procedure Check it across C87 1000uf or the collector of VT21, the regulator transistor on the heatsink for 11.6v. Check the value of the adjust pot. It should be 220 ohms. If it has risen replace it with a good quality type such as a ceramic. J.