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If you get anyway near Belair, give me a yell at 443-250-6381. I have some old neon sign transformers that may do just right. We could dummy it up in the garage and see if the tab can be deformed. Tom

You may want to try swapping tubes from the other spots too, although it seems they're all biased for the same operating conditions, so should wear at the same rate - but if they are only on when

A picture of the memory board(s) in you 7854 would help. Here are pictures of my ID screen and memory board (single) in my 7854: http://www.banishedsouls.org/c2df3757f1/7854/7854%20-%20ID.jpg

One of the first places I checked. No dice though. Mark

Sounds fairly close in width to mine, gap-wise. Bummer. I live about 40 minutes away from Bal'mur, in southern MD. ;-) Mark

If your 7603 is good otherwise, HV transformers are available, as Ebay 271043134636. (no connection to me). I got one and will sometime try it. Bob

Sorry, I forgot to put the link to the pic! http://groups.yahoo.com/group/TekScopes/photos/album/1008509759/pic/2017617864/view?picmode=&mode=tn&order=ordinal&start=61&count=20&dir=asc Regards, Bogdan

Hi John, This is a screenshot of the ID on ver -02 (when working...). I do not know if it is any between this and the vessions of the ROMs. The other way (best) is to open up the right side and remove

wrote: Coincidently those are the stages that have been giving me trouble. I have to break out one of my faster oscilloscopes to see what is going on with them. It is possible that the 500 MHz

Same problem that I have. I suspect a short to ground (or to the HV coil)on the LV side of the transformer as the measured resistance between the two coils is only about 5.5 KOhms. Will have to keep

Hi David, My brain fart there. I meant to say D-mode. Sorry, Tom

Did you have a particular FET in mind? All of the enhancement mode FETs I am familiar with have way too high a gate to source threshold voltage. Small signal and power depletion mode MOSFETs used to

You might check with Tucker Electronics in Garland Texas, they had some Tek CRT's for sale a while back for pretty reasonable prices! Don't remember which ones, but he had several.

My purpose in adding a resistor was to limit the inrush current. I believe my problem was a bad HV transformer. Based on symptoms, I think there was a partial short in the output. This could have the

It was about 10 years ago, but it was a fairly large gap (something like 1/16"). I'm located in Austin, TX. Andy

It looks like the required RF power levels aren't out of reach for JFET substitution of the 7587 tubes. The tricky ones will be the 500 MHz multiplier and the 100 MHz driver for the 200 MHz diode

My 7854 was working last I checked. Probably still is even though I may not be getting back to using it for a couple more months... Is there a quick indication of which version they have? I could warm

Hello all (and Ha Happy New Year) I am looking for the images of the version -02 of the 7854 scope. All I could find are either the -00 or the old ones from Pentti. Anybody have them? I was able to

Dunno if it'll be helpful or not but I'd had good results with LND150 depletion mode mosfets in various lower frequency tube circuits. They act a lot like a pentode in-circuit, with no screen

Good Day, and a Happy New Year to everybody. from a front end print .svg.? I could not agree more. I am very satisfied with the Front Panel Designer from?http://www.schaeffer-ag.de