04-01-2023, 02:19 PM
Vortexion recorders still hold their magic. I do have a schematic for a CBL/6 for Barney but I can't work put how to attach it.
I have just embarked on restoring a CBL 5 which has been kept in a damp location. I want to do it in a sympathetic and careful manner but I am encountering problem after problem. I am working on the left amplifier out of the deck first. I found a schematic but I could only find a complete manual for a CBL 6 which I downloaded at a small cost. So far I have reformed two of the double 32 mF electrolytics (leakage around 200 micromaps) and replaced the other. I have replaced some other electrolytics and the other capacitors seem OK. The heaters on the valves have been checked - only a few Mullards plus some CV numbered valves. I have tried to insulate the crumbling rubber wires where in can and I got to a point where I felt able to apply mains by soldering directly to the 9 pin socket. Nothing happened so with some further investigation found the voltage selector corroded and then no continuity across the primary. I wanted to push on so I connected a replacement transformer and wired it up. I managed to get the HT to 330v but no sound – hum or crackling - via the external speaker jack. I will continue to battle but here are specific questions –
1. What is the voltage across the transformer taps 9.7 and 9.5?
2. Are the rubber wires into the transformer casing subject to breaking?
3. Does anyone know where to find a manual?
Thanks for any information
Phil
I have just embarked on restoring a CBL 5 which has been kept in a damp location. I want to do it in a sympathetic and careful manner but I am encountering problem after problem. I am working on the left amplifier out of the deck first. I found a schematic but I could only find a complete manual for a CBL 6 which I downloaded at a small cost. So far I have reformed two of the double 32 mF electrolytics (leakage around 200 micromaps) and replaced the other. I have replaced some other electrolytics and the other capacitors seem OK. The heaters on the valves have been checked - only a few Mullards plus some CV numbered valves. I have tried to insulate the crumbling rubber wires where in can and I got to a point where I felt able to apply mains by soldering directly to the 9 pin socket. Nothing happened so with some further investigation found the voltage selector corroded and then no continuity across the primary. I wanted to push on so I connected a replacement transformer and wired it up. I managed to get the HT to 330v but no sound – hum or crackling - via the external speaker jack. I will continue to battle but here are specific questions –
1. What is the voltage across the transformer taps 9.7 and 9.5?
2. Are the rubber wires into the transformer casing subject to breaking?
3. Does anyone know where to find a manual?
Thanks for any information
Phil
