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I looked around and didn't find another group for other electronics repair except for very specific ones. thinking about the poster who asked something about a tube type audio amp I wonder if it might

Update, the issue persists even without vertical deflection, and with the scope cased up. That leaves only the CRT and the HV supply left. Could a bad voltage multiplier pop up only when increasing

Hi Lorn, I have a 475, which is similar. I`ve noticed that it needs the covers on, otherwise it will pick up hum and either produce a triggerable trace, about 2 minor divisions high, or a thick trace

What's interesting is my 465B developed the same problem when I took the cover off (see "465B won't trigger" thread). I noticed on slow time scales where more pulses are displayed that I could clearly

Roy.. I inquired about the other 547 in Mass for you but haven't heard back from the seller. S/he's actually in Central Mass. Maybe a bit closer to you.

Probably something weird about the digest mode? I'll switch to Individual Emails for a day or so and see if it changes. Dave M

Carl, I am in the market for a 547, but Chicago is a long way from mid state New York where I am. It is possible that in the future I’d be out your way, though. Roy Roy

My measurements of the 3k9 resistors: R1152 -- 3k95 Ohms & 26.83 Volts R1132 -- 3k97 Ohms & 27.19 Volts My measurement were: Q1136 -- 5.75 Volts Q1156 -- 5.58 Volts

OK. the board is out and the sweep assembly also out. Here what IS A PROBLEM and I do not believe Tek would build something like this.... The delay sweep "wafers" are FRICTION operated ! The funky

Loading, finding, looking up, bla bla bla, why not just put the image here ? Too bad Dropbox turned into garbage. As for how you described the symptom, I would look at all voltages on the CRT,

Sounds like you have something to investigate. Be careful not to electrocute yourself when finding the source of the arc, it's not supposed to arc! Try sticking plastic, move things apart, etc. to

I recently acquired a 465 in rather good condition, and have been cleaning it up over the weekend. Power supply rails have been checked to be within spec, including the -2450V one. CRT bias adjusted

Hi Tony, Glad to hear that your PSU is functional. The diode that you are referring to is VR1297 (9V zener) right? Not CR1297? In regard to the Read Out, I believe that I read somewhere in the

Who cares about or or of .... I need to remove / reinstall SWEEP (!) generator board. Let me start with since it is "older" technology - does the board "pulls-up" from "mother board"? Or is it

Hi John : Now the PSU had no problem , after find the zener open ( CR1297 ) , and reference the uploaded file by Robert. CR1311 and CR1312 is not fast recovery , TEK parts reference is 1N5823 ,which

It worked both times. -Chuck Harris David M wrote:

Well, it happened again. I made sure to click the little "Quote Whole Post" icon before replying, but the quoted text didn't make it into my reply. Groups.io gone bonkers, or is it me? What am I

Wasn't because I didn't try... I made sure to quote the original post in my reply, but I guess groups.io scrubbed it. I replied by "Reply to Group" at the bottom of the original message (I get the

Thanks. On scopes with no button labels I use Innerclean by Chemical Guys. Its for cleaning car interiors but works good for other stuff (like scope faces).

Many thanks for what ? Relevant prior post not included ???? -- Dave Manuals@... www.ArtekManuals.com