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Hi Windsor Your Email address no longer works. I hope you have sent the tek 475 fan. Let me know. Richard Thanks the very set So I

supplying diodes of the Even the Selenium Rectifiers aro OK (at this time), REPLACE them! Often they fail suddenly with a short and not in any case the fuse(s) blown fast enough to prevent damage to

If you have identified the bad filter cap, I probably have a good salvaged replacement that you can have for a few bucks. Let me know. Stan w7ni@... mongteen@... wrote:

Mixing 21,22,21A, 22A. Let me say I don't know of any reason why you couldn't do it but I have never tried it . . . I will keep my eyes open for some plugins for you. I just enlarged my collection

triggers <snip> those Hi Stan, Thanks for the advice. The only 21A/22A I have ever seen, which belongs to a friend, has the later version triggers. These timebase plugins are not easy to find

morriso2002@... wrote: Hi Morris, There was an extensive modification to the 21A and 22A tunnel diode triggers at SN 11000. 21A and 22A timebases have the older tunnel diode

Hi Windsor, You seem to have found the source of the jitter however I think you're working around the fundamental problem with your small bypass capacitor. Check the regulated power

Hello, I have a RM31a that has a 54x CRT that works reasonably well. Thanks Dean :) There is a slight horz. jitter about 2mm worth. So I check the left deflection pin and see that there was no

Greetings; I am trying to understand the failure mode of one of these in a 3A6. Both cathode tabs are melted and the 47^ screen resistor is smoked. With great trepidation, I replaced the defective

Sorry Morris. It was the 21A/22A timebase plug-ins I was referring to in my comment, rather than the vertical plug-ins. I *might* be coming into some of these shortly. If I do I'll let you

The 555 will take quite a wide range of vertical plugins including the 53/54 series, the letter series and the 1- series. With some of them (such as the 1A4) you have to be careful that the timebase

Finding a non-blank plug-in for a 555 is tough enough, let alone a blank one. I've never seen one Andrew but I'll keep my eyes open during flea market hunts. Stan G. and Deane Kidd are the only

Hi All, Does anyone know of a company or business that may be able to supply boards for the Tektronix TDS model oscilloscope. They could be boards that have been pulled from non-repairable

module I would be surprised if a kit is still around. When I wanted to build a custom plugin I butchered an old type 80. The dimensions are the same and the plug just has to be reversed. I'm sure

Hi All, Could anyone tell me where I could find a "blank" vertical plug-in module for a Tek 555 series scope? Apparently there was a kit available at one time. Regards, Andrew

need help on repairing the time sweep for tek 321a-everything else works. thanks, sid

does anyone know how i can get a hold a tek 2221 tek service manual. thanks, sid

The 1L20 manual is available for rental from W.J. Ford: http://www.falls.igs.net/~testequipment/manuals.html

Hi Andrew, You are right about the 1L20 being used in the 555. It can also be used in any other 530/540/550 mainframe. There are a lot of places to look for manuals if your request here does

Thank you Dean. As soon as my manual arrives I will look into this. I thought the fan was maybe a 12vdc fan. Richg --- dhuster@... wrote: