My new (to me) s/n B041515 7904 arrived DOA. (ebay, "not working, for parts".) With the help of my mostly trusty DSO138 I found the shorted 47/25V dipped tantalum on the -15 supply. Replaced it

Let's see your stats for Tektronix equipment. I have never seen tants from Tek gear eject into ceiling tiles. I reject any dogma that is uninformed by relevant data. -- Prof. Thomas H. Lee Allen

Re. recapping 2465B Youre on the cusp of learning the *hard way* why advice to NOT replace caps is extremely bad. Out of the multiples of semi load after semi load of equipment I worked on "back in

Hey Guys, I'm in the process of (mostly done I think) repairing a 7904 power supply that goes into pulse mode. I replaced a number of the bad tantalums on the cap rectifier board which brought some

I don't dispute the issues you are experiencing with mail delivery but it is not like this everywhere. I mailed the books on Saturday morning. Monday afternoon I received an email from a member that

I have seen tektronix ferrite transformers broken for epoxy stress https://antiqueradios.com/forums/viewtopic.php?f=8&t=259178&start=20 -----Mensaje original----- De: TekScopes@groups.io

To Chuck, perfect advise as always. A few notes please: 1/ PSU fail to turn on is likely NOT solved by a recap of the PSU. Caps failure are rare but ESR goes up and C down as the electrolyte dries

I don't like to assume anything. When they fail, worry about them. Some go on forever, it seems. Any of the transformers that use the brown epoxy are likely to fail at some point. It doesn't seem

I recommend that you leave the A1 board alone. It is very difficult to remove without damaging something, and the capacitors on the A1 board are rarely bad. I would say never bad, but I am sure

Yes, thank you, thank you, thank you. I just finished reassembling the 7613 mainframe, after replacing the U214 chip (155-0022-00) on the vertical interface board. The board can be accessed from the

Hello Chuck, My RM565 does have the aluminum can, but so far, it has been working like a champ so far. I am assuming that this will eventually fail. I do hope that it will hold out. But both of my

Chuck, Thanks for the advice! Saw your earlier work on getting the 2018 cap list up dated. Thank you for that work too! I am going to give the re-cap a try (love the dead fish analogy on those SMD

Dennis, You might take a look at "Attack Epoxy Solvent" https://www.gesswein.com/p-5097-attack-epoxy-solvent.aspx I used something like "Attack Epoxy Solvent" from Varian Associates in the late

On SMD caps: Take the cover off of your scope. Set it on the bench CRT side of the chassis down, A5 board up. Find the 4 SMD caps, and look at the solder joints that hold them to the circuit

I was hoping not to have to recap.... But it sounds like that is where this is going. I will just order the A5 SMD caps to have on hand when I dig through it instead of waiting for another order thru

Hi Jaap, This is Rogerio from Brazil. I own some 271x SA's that seem to have errors in the Display storage boards (most of them I could buy for a very low price from users (not companies) so there was

Look for a signal called x/y shutdown. It originates on the readout board (J2138), goes via coax to the horiz amp (J503), then a 2-pin ribbon (P504) to the main interface board (P38) and then pin BC

Attilio, That looks like there is a fault related to the vertical channel switch, U214 (schematic 3 - Vertical Interface). There is an input to U214 labelled 'X-Y shutdown', this disconnects the

Sorry, I wanted to add that moving the track only horizontally with the Position command of the 7B70 time base the readout does not move. -- Cheers Attilio

Thank you so much Tom, I will follow your precious advice, acting with the utmost caution. Excellent idea of ​​taking a picture of the position of the filter adjustments before