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Hi Bert No its not the Tunnel Diodes that are faulty its the Trigger driver JFET's have blown, in fact one of them was cracked which I was unable to see until I removed the Heatsink, so I hope someone

I'm really surprised that no one else has mentioned the infamous tunnel diode problem. This often shows up on a lot of the older Tek products and the are many, many previous discussions on this and

This scope is currently on eBay. If it is of any significance, the probes are permanently wired in, according to the description. Colin.

Hi! My tektronix 214,221 and 222 is now working with lithium batteries. /g/TekScopes/photo/66992/1?p=Name,,,20,1,0,0 /g/TekScopes/photo/66992/2?p=Name,,,20,1,0,0

Excellent point, Artekmedia. I'll know soon enough! -Stefan

Well Success at last Fabio !!!!! I did not realize that the FET's were in sockets under the heatsinks, I decided to change them and I still had no Trigger, as they were out I tested the FETt's on my

This should be covered in the service manual: e.g. https://docs.telegraphics.com.au/Tektronix_070-1753-01_466_Storage_Oscilloscope_with_option_Service_Instruction_Manual_Revised_Nov_1982.tif

120-1087-00 transformer or complete HV module for a 7603. Chris

Hi all, I've finally got a mo to look at the 466 I bought sight-unseen a while ago. I'm not really familiar with analog storage scopes, though. I've been given to understand that after switching on

Interesting... Raymond

Also in this day and age it is not sufficient to look at the just the unit serial number. There are so many organ transplant units floating around where a previous? owner swapped an early A5 in a

As Siggi has mentioned, the A5 board (processor control) is a frequent source of failure in these scopes.? But Tektronix went through several design iterations of the A5 board over the years

Good morning John, Yey! Seems like you've made some progress there! A reading of -7.9V on the pins 2,3 of U460 is not normal, if the input is set to EXT and the input jack is grounded... the output of

I had a flash of inspiration over this; I wondered if the Z-axis modulation was functioning properly. I tried putting a sine-wave into the CH1 vertical and a square-wave into the external Z input.

Good Morning Fabio, I have carried out the tests to the U640 as you suggested for both the A trigger and the B trigger here are the results A TRIG 14/15 20.4 mv 2/3 -7.9 volts !!!!!!!!!?????? B TRIG

Thanks guys for the responses. I'm definitely new to scope repair. The 2467 could not be passed up but it did come with the faults when I purchased it. I do have an inexpensive digital scope that I

I wouldn't pick to much on Li-Ion chemistry. There are a lot of deployed chemistries and construction methods. Some have problems some don't, just like NiCd & NiMH. I've seen plenty of NiCD rotting in

Well an eye diagram is really just the envelope of all hi/lo & early/late levels & transitions in a data stream. Assuming that you can trigger off something relative to the stream, even old scopes

Hi, everybody. I ended up with these 5A18N and 5403 manuals when I bought my 5110 scope a few months ago. Came with two 5A15N's and a 5B10N, but those manuals obviously don't apply. Let me know where

Thank you Fabio. I'll have a closer look at the TG501 over the next few days - unfortunately its difficult to access any of the components on the main board without first removing the multiplier board