B&K 1076 TV analyst
 

well I got a BK 1076 analyst on the way...

I dont think it has any transprancies so the plan is to print a indanhead test pattern on a laser printer to some clear plastic, I think that can be done.

That is of course if the 1076 is not a basket case.

I will post some pics when I get it.

Dave, I was recently given three BK 1077 Analysts, included were three slides, the standard test pattern like my avatar and a couple others.

I've made a High Res scan of you can DL and possibly print to a piece of clear mylar:

http://www.vintagetvsets.com/temp/bkslide.jpg

It should be the actual size so if you print it as is it should be right, you might have to trim the edges a little.

I tested it, it print's fine from Photoshop but not from Windows picture viewer.

Since I don't know what you will be using I made a pdf file from it, it should print fine from Adobe reader.

http://www.vintagetvsets.com/temp/bkslide.pdf

I should warn you, these are large, 10-11 meg.

B&K 1076 Slides
 

Eric,

Will you please upload the other two slides, dots & cross-hatch, for the 1076.

THX

Thx Eric, I am looking forward to playing with this.

I can scan the others tonight possibly.

I really need the other two as well. Please scan. Many thanks.

Here are the other two in pdf format.

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

I couldn't help but notice on those scans how relatively crudely the artwork seems to hav been prepared. (I assume the scans are accurate reproductions.) I'll have to check the few slides I have to see if they're similarly rough. I guess that must have been considered "good enough."

The scans look pretty much identical to the slides.
They have some imperfections because they're old and have been used a lot, but also if you are looking at them in Adobe at 295% it really brings out the issues.
Scale it back or print it to scale and it they look OK.

The small scratches and blemishes around the edges don't really matter because only the center part is scanned by the Analyst.

Eric-

Thank you for posting those slides. I hope you don't mind, I downloaded them as well, hoping I get a 1076 or 1077 in the future. Years ago, I had two B&K Dynascans (the very early equivalent of the Analysts, I think), but they were stolen before I could restore either one. I had always wondered where the name Dynascan came from, until I saw those units.

Eric,

Thanks for the scans.

...

It'd probably be pretty easy to Photoshop the Indian Head pattern in to one of these also if you wanted something a little different.
As long as the proportions are correct it should work.

I don't think the resolution of the B&K or the TV is critical enough to pick up on the small imperfections.

Well I got it, better than I expected (that's rare off ebay), anyhoo it looks completly untouched, no hack repairs. So I will start with a basic check of the filter caps (there are a couple cans mounted under the chassis) and there are a few single electros (will not even bother to check those just replace). I could see no trauma (breakage or burnage) so looking good so far.

No rust at all and the overall condition would be good. Handles are intact, one knob has some broken edges but not anything that would effect use.

It has 2 6dq6's so I hope they are ok (I have spares if needed).

There are no cables of course and there is a place for a HV prob, not sure what that is all about. Very solid build I love the way this old vintage test gear was made, looks like it was built to LAST...

The fly looked ok (not burnt or anything like that).

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

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

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?

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

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?

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.

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.

Use of B&K1076 at US pavilion of NY World's Fair
 

see second page

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.

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.

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

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

try again

hmmm I wonder how old it is.

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?)

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

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

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 :yes:

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!

I am going to leave them be, not sure about how those pins work that hold them in. I have a solder sucker iron that works great on PCB.

I hope to stuff the 3 section can tonight. I figure no hurry on replacing that NP cap since I just want to see if I can get it up and running thru the RF output anyway.

Banderson, can you confirm the value of C9a/b. Per the schematic it is a 50/50mfd both at 150v.

It should be a can on the bottom of the set on the left side looking at it from the bottom, closest to the power tranny. Mine was switched out.

oh and confirm the can is a common POSITIVE!

Sorry, I have a couple 1077s which are a bit different. C9 is a 0.047 uF cap to the yoke test signal output. Mine do have a couple 10uF and a 20uF with positive to ground. They are for filtering the B- supply.

anybody else with a 1076 let me know. the bias cap (I think) in mine does not match up with my schematic. I just dont trust it since it does not look orig (the cap).


The 330 resistor comes off the bias supply diode to a 10uf section of the cap.

then a 3.3k resistor goes from that point to the second section a 50uf. This section is tied to the 3rd section a 20uf (so 70uf total).

from the 70uf total junction it goes to the V1 photo multilplier tube (blk stripe), and to 33k power resistor on a term strip (brw stripe). Che can is connected to a term strip that is rivuted to the chassis (not solderd just rivut). Per the can its a 50/20/10 350v on all POS can.