08-03-2011, 05:57 PM
The valves turned up yeah 
I Fitted the missing EF95 then did some initial checks heater chain continuity is there, main smoother/reservoir electrolytic looks ok so connected to the Variac and wound it up to 80V left it for a few mins before winding up to 120v, few more mins then went to 240. Pilot lamp was dead so replaced 6.5v 300mA lamp all ok The valves were glowing nicely so I connected it to a 405 TV but nothing happening when connected to the TV set.
Opened it up and OH! My! GOD!! what a rats nest of components, lots of Lozenge Dubiliers, many shiny black Plesseys, a few HUNTS, one large flat waxy A few TCC metalpaks/metalmites and a few GEX34 diode thrown in for good measure, looks like they decided to use anything and everything in this and all the crappy caps to boot, still hindsight is a marvellous thing and they certainly would not have expected the generator to be still in service 50+ years later. Finally to add to the mare and make things harder, resistors all tightly packed around everything with lots of wires and looms, now I see why I started to like PCB to hard wired chassis.
The unit also packs in quite a large mains TX and 20 valves, 12 of them being ECC83's ( if the valve robbers had got their paws on this) I now can see why the case has so many vents one every surface bar the front.
I changed the following caps as they were very sick looking and seemed a good starting point
Big flat waxy a 1000pF no change
One large .5uF HUNTS no change
one TCC metalpak electrolytic 8uF
Ahaa steps in the right direction, I can hear the what sounds like a TMB working now.
I have it connected up to the Fergy TV I've been working on (confirmed it's ok with Testcard C) and, nothing although when I switch the Taylor through all its 10 different outputs ( hoz bars, grid1, grid2 etc) the screen blips as I turn the taylors control so something is sort of there.
This is going to be a long fix as all the other caps are so buried a mass disassembly will be required. I guess it would have been boring if it had worked, but to be honest I would have preferred it to have, restoring test equipment is not my bag or idea of fun......oh well deep breath!
Chris
Edit: with the front panel removed I get some reasonable access to some of the caps, but the ones at the rear are another matter, I will have to put my thinking cap on for the plan of attack on those. Luckily I do have an original manufacturers schematic to work from
I Fitted the missing EF95 then did some initial checks heater chain continuity is there, main smoother/reservoir electrolytic looks ok so connected to the Variac and wound it up to 80V left it for a few mins before winding up to 120v, few more mins then went to 240. Pilot lamp was dead so replaced 6.5v 300mA lamp all ok The valves were glowing nicely so I connected it to a 405 TV but nothing happening when connected to the TV set.
Opened it up and OH! My! GOD!! what a rats nest of components, lots of Lozenge Dubiliers, many shiny black Plesseys, a few HUNTS, one large flat waxy A few TCC metalpaks/metalmites and a few GEX34 diode thrown in for good measure, looks like they decided to use anything and everything in this and all the crappy caps to boot, still hindsight is a marvellous thing and they certainly would not have expected the generator to be still in service 50+ years later. Finally to add to the mare and make things harder, resistors all tightly packed around everything with lots of wires and looms, now I see why I started to like PCB to hard wired chassis.
The unit also packs in quite a large mains TX and 20 valves, 12 of them being ECC83's ( if the valve robbers had got their paws on this) I now can see why the case has so many vents one every surface bar the front.
I changed the following caps as they were very sick looking and seemed a good starting point
Big flat waxy a 1000pF no change
One large .5uF HUNTS no change
one TCC metalpak electrolytic 8uF
Ahaa steps in the right direction, I can hear the what sounds like a TMB working now.
I have it connected up to the Fergy TV I've been working on (confirmed it's ok with Testcard C) and, nothing although when I switch the Taylor through all its 10 different outputs ( hoz bars, grid1, grid2 etc) the screen blips as I turn the taylors control so something is sort of there.
This is going to be a long fix as all the other caps are so buried a mass disassembly will be required. I guess it would have been boring if it had worked, but to be honest I would have preferred it to have, restoring test equipment is not my bag or idea of fun......oh well deep breath!
Chris
Edit: with the front panel removed I get some reasonable access to some of the caps, but the ones at the rear are another matter, I will have to put my thinking cap on for the plan of attack on those. Luckily I do have an original manufacturers schematic to work from
