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Stockden · 7th Sep 2021, 7:44 am

It’s many years since I owned one of these but my recollection is that yes, the black heat sink unscrews. The reason I know that is that my TF1066 also had low output and the cure was indeed to replace that valve.

Hugh

7th Sep 2021, 7:44 am	#3
Stockden Heptode Join Date: Mar 2008 Location: Forest of Dean, Gloucestershire, UK. Posts: 648	Re: Marconi TF1066B/1 It’s many years since I owned one of these but my recollection is that yes, the black heat sink unscrews. The reason I know that is that my TF1066 also had low output and the cure was indeed to replace that valve. Hugh