26-05-2013, 06:43 PM
Flushed with success, and having mowed and strimmed, I decided to have a look at the Timebase etc. There's a Sync/Trigger Amp, Timebase and X-Amp.
It seemed to me that the easy approach would be 'Left to Right', ie start with the Sync/Trigger Amp and work through to the CRT. Switching to Mains Trigger would give a simple signal to look at.
The first problem I found was that the Valve Types are marked on the top of the Chassis but the Valve numbers are below. Ah, well, it can't be too difficult can it? Well yes it can - see attached. The two valves in the Amp are buried under the switches. Lurking in there are at least 4 black Hunts. Access to anything ranges from 'Oh, dear' to 'How the very devil do I get at that?'. You can fill in your own expletives.
Finally, the output signal on R215 is a slightly distorted Sin wave not the nice clean square wave shown on the Diagram.
Trying to look on the bright side this looks like the worst part, and I can only spot one other Hunts in the rest of the Chassis. I could always start at the other end but that sounds like an admission of defeat before I even start.
Alan
It seemed to me that the easy approach would be 'Left to Right', ie start with the Sync/Trigger Amp and work through to the CRT. Switching to Mains Trigger would give a simple signal to look at.
The first problem I found was that the Valve Types are marked on the top of the Chassis but the Valve numbers are below. Ah, well, it can't be too difficult can it? Well yes it can - see attached. The two valves in the Amp are buried under the switches. Lurking in there are at least 4 black Hunts. Access to anything ranges from 'Oh, dear' to 'How the very devil do I get at that?'. You can fill in your own expletives.
Finally, the output signal on R215 is a slightly distorted Sin wave not the nice clean square wave shown on the Diagram.
Trying to look on the bright side this looks like the worst part, and I can only spot one other Hunts in the rest of the Chassis. I could always start at the other end but that sounds like an admission of defeat before I even start.
Alan
