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BillDWVA · 17th Nov 2018, 3:22 pm

^^ Yes, apologies, with a clearer circuit image the components I was referring to are actually C15 and R23 which are in the signal path to the output valve V4.

V5 is the meter drive and it’s HT supply comes via pin 4 plug 5. It looks like it may only be energised when the set is switched to ‘Record’.

17th Nov 2018, 3:22 pm	#11
BillDWVA Pentode Join Date: Nov 2010 Location: Tenby, Pembrokeshire, Wales, UK. Posts: 139	Re: Ferrograph 4A: Restoration advice needed ^^ Yes, apologies, with a clearer circuit image the components I was referring to are actually C15 and R23 which are in the signal path to the output valve V4. V5 is the meter drive and it’s HT supply comes via pin 4 plug 5. It looks like it may only be energised when the set is switched to ‘Record’.