B&K 1076 TV analyst

[DaveWM]

oh and it had the B&K test patter transparency in it!

[Eric H]

Here's a custom made slide with the Indian Head, I haven't tried it yet to see how it looks because I don't have any transparencies.

http://www.vintagetvsets.com/schem/ihslide.pdf

[Eric H]

By the way, does anyone know if the purple glow from the CRT in the Analyst is UV or harmful to look at at length?

[bandersen]

Originally Posted by Eric H

Here's a custom made slide with the Indian Head, I haven't tried it yet to see how it looks because I don't have any transparencies.

http://www.vintagetvsets.com/schem/ihslide.pdf

Sweet I've always wanted this! I don't have any transparencies on hand either, but I'll be getting some

[ctc17]

Originally Posted by Eric H

By the way, does anyone know if the purple glow from the CRT in the Analyst is UV or harmful to look at at length?

I wouldnt think so, its about the same as a black light and not nearly as bright.
I like the Indian head, thanks!

Whats the difference between a 1067 and 1077?

[Eric H]

Originally Posted by ctc17

Whats the difference between a 1067 and 1077?

The age of the unit mostly and updates here and there.

The 1076 was 50's? & 60's, the 1077 is Later 60's through 1979 at least, not sure when they stopped making them, I would assume they have?

One of the 1077's I got recently has 1979 date codes on the tubes, the other 1077's I got have 1968 date codes.

[old_tv_nut]

Originally Posted by Eric H

By the way, does anyone know if the purple glow from the CRT in the Analyst is UV or harmful to look at at length?

Not harmful. Incidentally, this phosphor was used for black and white flying spot scanners because of its short persistence, which minimized video smear. Color scanners used a greenish phosphor that required at least a double-time-constant smear correction circuit.

[old_tv_nut]

see second page

[DaveWM]

slow going (work getting in the way)...

Got one can re stuffed, leaky.

Got one to go and then a few singles that I will have to order, and a few ceramic tube papers to do.

anybody know where I can get a 20uf 350v non polar cap? Its the coupling to the video out jack. I have heard about the back to back polarized trick, but I am not 100% sure that is a good way to go. I have also read about using diodes to shunt the caps when the voltage is reversed (on the back to back deal) again, micky mouse, I would rather just find a proper replacement.

there are a few nasty looking disc caps including some that looks like they are split although that may be the way they were made. I ran into this recently when working on an old maggin mpx unit. there was a disc cap that was .1uf 75v, and it was kinda double thick split in the middle look about it.

never seen a disc cap that high a value. Well it was shorted so I will look at these very close. they are on PCBs so easy to remove and replace anyway.

[old_tv_nut]

350v non-polar? it's hard to imagine where that would be used that it could experience plus or minus hundreds of volts - is it supposed to be able to inject at the plate of a video amp stage as well as a grid for troubleshooting a set, or what??? If the input to the cap is +100 or more and the output is only used to inject to low voltage grid points, you shouldn't need non-polar.

[DaveWM]

yea it seems odd but that is what is there and on the schmatic. Maybe because of the way the phase switch takes off the the low volt cathode and the high volt plate, or maybe to allow injection at other than grids.

See C1 on the schematic

hmm attachment did not work

[bandersen]

Maybe one of these (scroll down to the bottom) ? They have a 20uF @ 400v. Too bad it's $12.

http://www.surplussales.com/Capacito...lasticC-4.html

[DaveWM]

try again

[DaveWM]

hmmm I wonder how old it is.

[old_tv_nut]

Of course - I forgot - it's because of the phase switch - when connected to the cathode in the B&K, it might easily be connected to an injection point at a higher DC in the TV you are testing, even a grid if it's stacked following another stage. Thismight overwhelm the grounded 47K (or is that 4.7k?)