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 instruments

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

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 tub

Does anyone know where to get a decent front cover? I would like to take one to some of the plastic molding firms and see what it would cost to make up maybe 100 or so. This part seems to be the first

Hello Thanks for the tips. I found a replacement cap from a 545A "hangar queen". Now the RM31a works great and no jitter. The cap in question was leaky, thus causing the ripple. Oh and the 475 motor i

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 trigger circuitry in them

Hi All, I am looking for a Vertical Amplifier IC for a Tektronix 2235A Oscilloscope. Tektronix Part Number is 234-0133-20 Can anybody help? Regards, Andrew

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 jitter.

Hi All, I am looking for the following Tektronix parts: 317-0392-00 RES.,FXD,CMPSN:3.9K OHM,5%,0.125W 307-1020-00 ATTENUATOR,FXD:50 OHM,2X 307-1023-00 ATTENUATOR,FXD:50 OHM,5X 307-1024-00 ATTENUATOR,F

Hello! Well, after some time working with radio gear, now I am back to test equipment... Last time I powered my Tek 475, I found that the chopper circuit no longer worked. CH1 and CH2 work fine seppar

This is simply a 3900 ohm, 1/8 watt, 5% tolerance resistor. I expect a quarter watt unit would do fine. You can find these at Radio Shack. Or I can send you some. I have plenty (I bought out a Radio S

I'm not sure I'm on the same page here. What kind of plan? Which caps? Dean

Can anyone find the current rating of the 6.3V winding on transformer T402 (#120027) from a type 517 power supply ? T402 may actually be a dedicated 6.3V filament transformer since there were somethin

Hi, I am a student and I got my Tek 465B from an eBay auction. I know how to use the oscilloscopes, but have no experience in idendifying and fixing problems in oscilloscopes. The problem is that, the

Hello! I am in need of some info about the 7S14 plug-in... is it worth $150 in operating condition?. How does it performs? Please, any information will be welcomed. Thanks! JOSE ----------------------

Just a note to those who may have some 12AX7s in their equipment (e.g., 549 has 2) or junk box: Check your stuff for Telefunken tubes. There are some strange people out there who pay big bucks for the

Methinks the tops of my boots are needing a few more inches to clear the effluent which is building. Ain't no way the human sense of hearing has the bandwidth or the dynamic range that even modest tes

Hello, Perhaps a change in subject is would be good right now. I caught up on the topics because I recently signed up. Anyway did you check the horizontal plates for jitter ? Because I had a problem j

Hello, I'd agree with both Stan and Dean. If you want to meet the specs spelled out in the manual, then you should go by the manual. But I and many others the ballpark estimate is good enough. For the

Interesting range of opinions thus far.. and *yes* there's a relationship to scopes in all of this, IMhO. At least re test equipment operation, there are physics-laws + state of the 'mensuration art'