oh dear... The first step on the road to TV repairs. Not only will you have big radios but a whole slew of giant goggleboxes cluttering the place. I loved the bit where you got fizzical with the handle clips.
I’m sure I had one of these but I don’t know what happened to it. I got rid of it before I was interested in televisions unfortunately. Is the thing in the back not some form of resistive divider ? Great video thanks for sharing
Nice find Andrew. Looks like the original probe was lost or broken and somebody has come up with a homebrew replacement for it. Crudely made but it does the job I suppose. ATB Doug.
Ours never had a probe - as supplied by RBM, it had a 'loop' which went through the button on the anode cap of a TV EHT lead which in turn was plugged into the CRT - this allowed the user to monitor the EHT whilst the set was running.
Is it actually designed to test the a.c lopt output by using the tripler to drive the meter with d.c?. I first thought it measured the high voltage d.c on the anode of the c.r.t, but i was wrong. I suppose if you wanted to measure the anode of the crt, a string of high voltage resistors would attenuate the h.v to a voltage suitable for the meter. I made the resistor string type for measureing 35kv anode c.r.t's about 30yrs back, plenty of anti corona laquer was helpfull :-D Shame the handle end caps were so rustified.
It directly measured the voltage at the final anode. The original 'probe' wasn't a probe, it was a loop connector through which the final anode button was pressed, then it went into the CRT and measured the EHT in real terms whilst the set was running - nothing extra was needed
Nice job Andrew. Looking forward to the old telly restore next then...
oh dear... The first step on the road to TV repairs. Not only will you have big radios but a whole slew of giant goggleboxes cluttering the place. I loved the bit where you got fizzical with the handle clips.
Much enjoyed, Andrew.
Nice meter Andrew. It's a slippery slope to your first vintage TV though. Probably too late for you to turn back now. 😃
I’m sure I had one of these but I don’t know what happened to it. I got rid of it before I was interested in televisions unfortunately. Is the thing in the back not some form of resistive divider ? Great video thanks for sharing
my understanding is that the tripler case (from an RBM colour set simply has high voltage restors in it
Hi Rob, It's from the Rank A823 chassis, my assumption (being a tripler) is it has capacitors and diodes. I'll have a dig around.
Nice find Andrew. Looks like the original probe was lost or broken and somebody has come up with a homebrew replacement for it. Crudely made but it does the job I suppose. ATB Doug.
Ours never had a probe - as supplied by RBM, it had a 'loop' which went through the button on the anode cap of a TV EHT lead which in turn was plugged into the CRT - this allowed the user to monitor the EHT whilst the set was running.
Negative DC? I thought they still had a final Anode? I had one but it was wildly inacurate. Mine was a Murphy but looked the same.
The Tek 460 series require a measurement of -2450kV on one of the test points.
@@Andrewausfa Ah yes OK Same as the HP. Focus and astigmatism elements I think.
Is it actually designed to test the a.c lopt output by using the tripler to drive the meter with d.c?.
I first thought it measured the high voltage d.c on the anode of the c.r.t, but i was wrong.
I suppose if you wanted to measure the anode of the crt, a string of high voltage resistors would attenuate the h.v to a voltage suitable for the meter.
I made the resistor string type for measureing 35kv anode c.r.t's about 30yrs back, plenty of anti corona laquer was helpfull :-D
Shame the handle end caps were so rustified.
It directly measured the voltage at the final anode. The original 'probe' wasn't a probe, it was a loop connector through which the final anode button was pressed, then it went into the CRT and measured the EHT in real terms whilst the set was running - nothing extra was needed