Gaseous A77 - UK Vintage Radio Repair and Restoration Discussion Forum

lesmw0sec · 16th Oct 2020, 8:40 pm

Broke out the dusty Revox a few days back as my son was interested to hear some early recordings. Left it running over dinner and came back to a delightful smell of electrical burning.

It turned out to be a 4.7 ohm resistor vapourised by a shorted RIFA cap (one of the anti-click relay circuits). A new 0.47 mf and all well again. Just realised that the old dear is now 41 years old! And yes, I changed the other RIFA's while at it plus some working but oozing, electros.

Radio Wrangler · 16th Oct 2020, 11:04 pm

Don't forget the motor start/run capacitors they won't be at their best by now.

David

16th Oct 2020, 8:40 pm	#1
lesmw0sec Octode Join Date: Jul 2009 Location: Carmel, Llannerchymedd, Anglesey, UK. Posts: 1,509	Gaseous A77 Broke out the dusty Revox a few days back as my son was interested to hear some early recordings. Left it running over dinner and came back to a delightful smell of electrical burning. It turned out to be a 4.7 ohm resistor vapourised by a shorted RIFA cap (one of the anti-click relay circuits). A new 0.47 mf and all well again. Just realised that the old dear is now 41 years old! And yes, I changed the other RIFA's while at it plus some working but oozing, electros.

16th Oct 2020, 11:04 pm	#2
Radio Wrangler Moderator Join Date: Mar 2012 Location: Fife, Scotland, UK. Posts: 22,899	Re: Gaseous A77 Don't forget the motor start/run capacitors they won't be at their best by now. David __________________ Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done