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

[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

[DaveWM]

try again

[DaveWM]

hmmm I wonder how old it is.

[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

[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?)

[DaveWM]

somebody pointed me to a crossover cap at parts express. Looks perfect.

[bandersen]

Cool! I thought they only had 100v caps ? Can you point me to the one you found ? I need to recap mine too

[DaveWM]

http://www.parts-express.com/pe/psho...=027-940&DID=7

if you want when I order I will get a couple extra, save you on the shipping as I will just put one in the reg mail.

I need to go over and see what else I need but will prob order in the next day or two.

[bandersen]

Originally Posted by DaveWM

http://www.parts-express.com/pe/psho...=027-940&DID=7

if you want when I order I will get a couple extra, save you on the shipping as I will just put one in the reg mail.

I need to go over and see what else I need but will prob order in the next day or two.

Sure, that's mighty nice of you

[bandersen]

How are you managing to recap the circuit boards ? Did you leave them in place or remove them ? Either way, it looks like a hassle!