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Heatercathodeshort · 30th Sep 2017, 3:56 pm

A little more progress. The output valve by the way is an N37 not an N78 as mentioned earlier.

I hunted through my valve stock but gave it up as a bad job. I have a couple somewhere but 'somewhere' refuses to load into my SatNav.

I decided to make up an adapter that even David would be proud of. Simply a B7G plug and a B9A valve base cross wired to take a PL82.

We now have good sound but too much, due to being uncontrollable. The dead short in the N37 has blown the bottom end of the volume control O/C....

Oh no! The dreaded pot boxes will have to be tipped out to find something suitable.
It's a job for Interlace but he says he can't read the small print resistance information despite me spending a huge sum on designer glasses for him. Oh well tomorrow is another day. Regards, John.

30th Sep 2017, 3:56 pm	#69
Heatercathodeshort Dekatron Join Date: Jun 2005 Location: Warnham, West Sussex. 10 miles south of DORKING. Posts: 9,147	Re: And the next one! a GEC BT2147 A little more progress. The output valve by the way is an N37 not an N78 as mentioned earlier. I hunted through my valve stock but gave it up as a bad job. I have a couple somewhere but 'somewhere' refuses to load into my SatNav. I decided to make up an adapter that even David would be proud of. Simply a B7G plug and a B9A valve base cross wired to take a PL82. We now have good sound but too much, due to being uncontrollable. The dead short in the N37 has blown the bottom end of the volume control O/C.... Oh no! The dreaded pot boxes will have to be tipped out to find something suitable. It's a job for Interlace but he says he can't read the small print resistance information despite me spending a huge sum on designer glasses for him. Oh well tomorrow is another day. Regards, John.