Just a tip for you. Magnetically deflected CRTS operate at approximately 1KV per diagonal inch or about 400V per centimeter. So, lacking any other data, this rule is pretty reliable.
With it being a bit over 2in that puts it about 2KV, the data I do have says that it's tested to run from about 850V to 2KV so that's about right. I wanted to start at a lower voltage and raise the voltage if it proofs to be insufficient. I can't see the comment you left on this video earlier at the moment, but I am subscribed to your channel already and I enjoy your projects!
@@captainsolder5247 I did say that rule of thumb was for magnetically deflected CRTs. Typically the higher voltage is because of the aluminum (aluminium) back coating of the phosphor. True, the static tubes do work at lower voltage because the phosphor is usually not aluminized. Especially the older tubes such as the one you are using. Keep up the great work.
@@videolabguy For some reason I read electrostatic where you wrote magnetically this morning. You are right on the aluminisation too, on these (B7S3) tubes the back of the phosphor is clearly visible. Thank you, I'll
Probably around 15kV i'd say, although I'd recommend looking into this some more before powering it up. Here's some info: www.avsforum.com/threads/anode-voltage-on-a-typical-5-color-crt.468341/ I'd recommend checking some service manual for devices that have a crt like that some might have some info on the voltage.
BTW i know i am a bit late but i have used bug zappers cheap Chinese high voltage models with an lm317 variable supply you can adjust this high voltage ,i used the idea on a P7 CRT SSTV 2 or 3 years back ...you will need that large transformer to drive the deflection amplifiers But ..i used a 800v ac out transformer but the 800 ac in series with another small tiny 240v transformers primary this drops the AC and you can control the ac out via a the secondary as in a magnetic amplifier ...very safe and very easy to control high voltages with this very old idea .
I actually hadn't thought about using a transformer to regulate the voltage although I have seen this used a couple of times. Might finds it's way into a project in the future!
Truly useless time spending to watch this video and make CRT oscilloscope drive vacuum tubes instead semiconductors in year 2024. If you want to get 1000+ likes use CRT that you have and build BK-Presision 1405 oscilloscope clone (16 transistors + one more for trace blanking as the option). This one even better than Chinese low price digital oscilloscope like well known DSO-138 and similar ones.
Just a tip for you. Magnetically deflected CRTS operate at approximately 1KV per diagonal inch or about 400V per centimeter. So, lacking any other data, this rule is pretty reliable.
With it being a bit over 2in that puts it about 2KV, the data I do have says that it's tested to run from about 850V to 2KV so that's about right. I wanted to start at a lower voltage and raise the voltage if it proofs to be insufficient. I can't see the comment you left on this video earlier at the moment, but I am subscribed to your channel already and I enjoy your projects!
@@captainsolder5247 I did say that rule of thumb was for magnetically deflected CRTs. Typically the higher voltage is because of the aluminum (aluminium) back coating of the phosphor. True, the static tubes do work at lower voltage because the phosphor is usually not aluminized. Especially the older tubes such as the one you are using. Keep up the great work.
@@videolabguy For some reason I read electrostatic where you wrote magnetically this morning. You are right on the aluminisation too, on these (B7S3) tubes the back of the phosphor is clearly visible. Thank you, I'll
The back of my 14.5 diagonal inch CRTTV says 120V but according to your math it should be 14,500V. What's going on?
"I need a new project like a moose needs a hatrack" has now entered my vocabulary. :D :D :D
I have 5.5 inch colour CRT, how much flyback power he takes? Cause I had no info on it. Thanks
Probably around 15kV i'd say, although I'd recommend looking into this some more before powering it up. Here's some info: www.avsforum.com/threads/anode-voltage-on-a-typical-5-color-crt.468341/ I'd recommend checking some service manual for devices that have a crt like that some might have some info on the voltage.
I forgot to mention the NBTV forum projects there ...worth a look ..
Hi make circuit of oscilloscope that run on video input composite of TV with out open any tv or any other device
you can't just demand that
BTW i know i am a bit late but i have used bug zappers cheap Chinese high voltage models with an lm317 variable supply you can adjust this high voltage ,i used the idea on a P7 CRT SSTV 2 or 3 years back ...you will need that large transformer to drive the deflection amplifiers But ..i used a 800v ac out transformer but the 800 ac in series with another small tiny 240v transformers primary this drops the AC and you can control the ac out via a the secondary as in a magnetic amplifier ...very safe and very easy to control high voltages with this very old idea .
I actually hadn't thought about using a transformer to regulate the voltage although I have seen this used a couple of times. Might finds it's way into a project in the future!
A rather complex build. Nice one.
Yip, This is quite the ambitious project. I'm pretty happy with the path it tok after the rebuild and learned quite a few things on the way
I'm guessing, that not really anyone is interested in making a CRT
Making the actual Cathode Ray Tube would be quite interesting as well, but a bit out of my reach for the moment
Truly useless time spending to watch this video and make CRT oscilloscope drive vacuum tubes instead semiconductors in year 2024. If you want to get 1000+ likes use CRT that you have and build BK-Presision 1405 oscilloscope clone (16 transistors + one more for trace blanking as the option). This one even better than Chinese low price digital oscilloscope like well known DSO-138 and similar ones.