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Chris55000 · 14th Nov 2018, 6:35 pm

Hi!

Your diagram looks close enough for me to say you've got it right and it just needs the component values adding!

If you show us a close-up picture of the thermistor in the O/P transistor base circuit I can probably root out its data, but I'd make a tentative guess at Mullard VA1040 to begin with!

Chris Williams

PS!

I did have a look myself for a 1M log. pot with DP switch and I couldm't locate one new or used from any of the UK sources anywhere - it seems high-value controls are hetting much harder to find today, what with everything being fancy-menu-and-button-operated!

14th Nov 2018, 6:35 pm	#29
Chris55000 Nonode Join Date: Aug 2007 Location: Walsall Wood, Aldridge, Walsall, UK. Posts: 2,868	Re: Fidelity HF29 Hi! Your diagram looks close enough for me to say you've got it right and it just needs the component values adding! If you show us a close-up picture of the thermistor in the O/P transistor base circuit I can probably root out its data, but I'd make a tentative guess at Mullard VA1040 to begin with! Chris Williams PS! I did have a look myself for a 1M log. pot with DP switch and I couldm't locate one new or used from any of the UK sources anywhere - it seems high-value controls are hetting much harder to find today, what with everything being fancy-menu-and-button-operated! __________________ It's an enigma, that's what it is! This thing's not fixed because it doesn't want to be fixed! Last edited by Chris55000; 14th Nov 2018 at 6:51 pm.