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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:

Hi, I am looking for a manual for a Tektronix 1L20 Spectrum Analyzer plug-in. I believe it is used with the 555 Scope? Regards, Andrew

Rich, the 465, 465B, 475, 475A, 464, 466 and 468 had identical fan modules. And by the way, this has nothing to do with bearing noise, but if you have a fan that has a dead spot and won't always

I recently picked up a 475 that has intermittent horizontal jitter and a noisy fan. Does anyone have any ideas about the jitter? The fan looks like it could be a challenge to replace. I am shopping

Hey, its perfectly OK to disagree with me, but in this case, you are also disagreeing with Tektronix since it is in the Tek microfiche where I read about the power supply problem. Yes, I suspect Tek

to the ... but the 7B92A SN B070000&up has no tunnel diodes anymore. Jorgen dj0ud

Hi, Would the person that responded back to my message concerning the communication options for the TEK 2230 please respond again. I can't seem to find your message. Thank

I hate to disagree with Stan, but my experience with 7A16Ps is that if you install them in a non-programmable mainframe, they power up OK, but the front panel is locked out. From looking at the

Thanks all, for your replies to my question... Kind regards, :) Michael