02-07-2013, 08:38 PM
Not much progress today due to other commitments.
So, fire up and check if everything is the same. Gloom and despondency - more ticking and green fuzz on the Tube. However the Timebase is running. Despite it being nearly dark I can't see any discharge even with the lights off - very odd. A careful 'screwdriver test' says there's plenty of PDA available. Switched off to connect my home-made EHT Probe, switched back on and no ticking with a trace as before - even more odd. However, very little PDA. Putting the other AVO Lead back on the chassis fixed that, and yes, I did remember to switch off and make sure it was discharged before I picked it up. The PDA is at about 6.5 kv as before and the trace is nice and bright. I supect I'll have to look when it's really dark. By the way, the 90 Second wait every time I switch on can get very wearing.
Next I put it on a Timebase Range where I get a good Trace and had a look at the signals. The first Picture is the Signal coming from the TB and the second is one of the X Plates - sorry about the quality. It X Amp looks pretty good to me. However, I'll have to RTFM because the Controls aren't 'normal' - aka like what they are these days - and they don't do quite what I expect. The Manual contains a Calibration sequence so I guess that should be next, then I can work backwards.
I'll be glad when this phase is over 'cause working on the underside of the Top Deck can be a bit exciting. I've only managed to get the back of my hand on the 400v once so far but that will last me for a bit.
Alan
So, fire up and check if everything is the same. Gloom and despondency - more ticking and green fuzz on the Tube. However the Timebase is running. Despite it being nearly dark I can't see any discharge even with the lights off - very odd. A careful 'screwdriver test' says there's plenty of PDA available. Switched off to connect my home-made EHT Probe, switched back on and no ticking with a trace as before - even more odd. However, very little PDA. Putting the other AVO Lead back on the chassis fixed that, and yes, I did remember to switch off and make sure it was discharged before I picked it up. The PDA is at about 6.5 kv as before and the trace is nice and bright. I supect I'll have to look when it's really dark. By the way, the 90 Second wait every time I switch on can get very wearing.
Next I put it on a Timebase Range where I get a good Trace and had a look at the signals. The first Picture is the Signal coming from the TB and the second is one of the X Plates - sorry about the quality. It X Amp looks pretty good to me. However, I'll have to RTFM because the Controls aren't 'normal' - aka like what they are these days - and they don't do quite what I expect. The Manual contains a Calibration sequence so I guess that should be next, then I can work backwards.
I'll be glad when this phase is over 'cause working on the underside of the Top Deck can be a bit exciting. I've only managed to get the back of my hand on the 400v once so far but that will last me for a bit.
Alan
