I seem to have an attenuation or gain circuit fault but having trouble localizing the problematic area. I have two 7A13 differential comparitors and the issue only appears on one of them which leads m

Hi, I am new to this forum. I saw a lot of helpful activity and expert advice here! I am restoring a tek 475 scope. It has both 15v and -8v power shorted to ground. Likely a bad cap(s) somewhere. The

I have the following for sale: 5115 Storage Scope 5A18N Dual Trace 5A15N Amplifier 5B12N Dual Time Base 201-1 w/Drawer Model C They have been sitting unused in my garage for the past 18 years. I'm ask

Hi all, I have a nice 7904 here which has a power supply in pulse mode. Using the troubleshooting procedure points to a fault in the HV section. Some years back I had a 7844 with the same problem and

I have a P6139A that is missing the collar piece 204-1049-00. Its the only 500MHz probe I have for my TDS520 and I would very much like to use the dang thing. Anyone know where this part can be had wi

I'm currently restoring a TM506 mainframe and have noticed something strange. I've seen this in other mainframes but didn't take much notice until now.. I have a Tek 067-1201-99 mainframe test module

Hi, I am trying with no success to repair a beautiful 561A in perfect state. When arrived, it worked almost well. After a light and careful cleaning, it does not work any longer. I believe I made no m

The readout function in my 7704A has been intermittent for years and, when it went out this time, I substituted the 155-0017-00 Time Slot Counter from my 7514 and that caused the readout to start work

The price was right (or was it?) so I bought an OF150. It has a bayonet optical connector, so I thought "Aha! An ST!". I was wrong. Although the bayonet works, the fiber (or fibre if you prefer) is to

Hi all, I just recovered a 7A13 late model, S/N 101927 from Guernsey. It's a late model, with LED Vc indicator. Fixed the usual problems with tantaliums and relays. Seems to works very well. Unfortuna

The following photos have been uploaded to the Another Tek 475 with HV failure ( https://groups.io/g/TekScopes/album?id=286843 ) album of the TekScopes@groups.io group. * fat trace.jpg ( https://group

Ettore Pelliccioni <ettore.pelliccioni@...> updated the album Another Tek 475 with HV failure ( https://groups.io/g/TekScopes/album?id=286843 ) : photos to describe issue, about topic https://groups.i

Hi, dear folks I had to admit, that I was very exciting playing with my old tektronix 475, before it suddenly fail, now no show more trace, nor beam finder. No HV, the TP1318 get 21.6V but no the wave

The following photos have been uploaded to the Another Tek 475 with HV failure ( https://groups.io/g/TekScopes/album?id=286843 ) album of the TekScopes@groups.io group. * putting inside.jpeg ( https:/

Ettore Pelliccioni <ettore.pelliccioni@...> added the album Another Tek 475 with HV failure ( https://groups.io/g/TekScopes/album?id=286843 ) : photos to describe issue

When people upload new photos, they generally do not say what the phots are. WHY NOT LIST WHAT THE PHOTOS ARE ABOUT!!!!! larry

I’ve just acquired supposedly good used SG505 along with TM504. Two separate transactions. Are there any precautionary measures to take before sliding the oscillator into the mainframe? And should I a

The following photos have been updated in the Mainframe Tester ( https://groups.io/g/TekScopes/album?id=286832 ) album of the TekScopes@groups.io group. * 10538A0E-5F19-4352-96E9-00698B2B54C6.jpeg ( h

Hello all, New here, have been browsing content for a short time. My fascination with Tek gear led me to your group. I’ve had a 2236 for several years now. Electronics is a self taught hobby I picked

For those interested... I've just uploaded the full set of 11801C EPROM files -- all boards, Timebase, Executive MPU, ACQ, Memory. 4 Mbyte ZIP archive, each and every ROM in 4 formats my eeTools TopMa