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https://nh.craigslist.org/ele/d/newmarket-vintage-electronic-test/7203322606.html No affiliation. Good luck! Jay

I was measuring the -5 off one of the pins off the motherboard leading to the digitizer board, I can see what's going on with TP92 and see if it's the same. Also I guess I'll pull all the cards again

The 2N2207 has a case style that became obsolete later, a metal cylinder with coplanar leads. Holding the transistor so the leads point down and the ones that are close together on the left, it's

Text mode makes layout a bit confusing, on my screen at least, especially for the plastics. One might add the layouts are all bottom view. Some TO-92's have a triangular lead configuration like the

The scoundrels! I guess they hadn't started that tradition yet when the 545B and 547 were made. For future reference, there are only a very small handful of ways nonpower transistors of that era were

HA! Thanks Chuck, I went through my 547 manual, front to back, and I don't see it anywhere, but I answered my own questions, I found a 2207 that I could see the socket clear enough and traced it out.

Hello Dave, I answered my previous questions from earlier today. I found a 2N2207 that I COULD see the connections and traced it out. So I replaced Q173 and Q184 with BC556 and bingo, fixed the

Hi folks, I've been unable to chase down this knob for my 485. It's 366-1385-00. Similar to other knobs for this purpose, but with a "skirt" at the base, without which, it's more difficult to tell

All I can convey is what I've learned from decades of fixing scopes (I own almost 200 of them, and perhaps a dozen or so 465/465B and related models). By far the most common sources of trouble are the

Tektronix usually puts the transistor pin-outs in the front of the maintenance section... You know, all of that stuff that nobody reads. -Chuck Harris Grayson Evans wrote:

Hello Dave, I order several BC566's to replace the 2N2207. Do you have any idea what the pin-out is on the 2N2207. I have searched the internet but can't find a data sheet on the 2207. i assume on of

Moving or jiggling the time base switch (Time/Div and Delay Time switch) has no effect on the problem. I have not cleaned it as it is difficult to get to, even after lifting the DM44 module. Regarding

If anyone does find them, I would offer a reminder to please upload copies to Didier's archive site. I can make them available at my end as well, once they're located. -- --- Bruce Lane, ARS KC7GR

Never have seen the disks available anywhere but sure would like to get my hands on them. --Eric

What you have sounds like a classic intermittent. Thinking of the possibilities, and since the power supply voltages are constant. 1) intermittent contact. That could be a power supply into the board.

(Sorry if these have already been suggested -- I haven't read the whole thread): Have you tried cleaning the timebase switch contacts? Does jiggling the switch have any effect on what you see? Also, I

I adjusted the +55V to exactly +55.0, and the other voltages fell in line. I attempted to measure the ripple with the scope, but not sure of the results. At the +110 TP I think i was getting about

Agreed, while it is pricy the SimmCon Labs LCD conversion is great. The only downside is the method of getting the video signals. They take a socket and you push that down onto either of two video

Hi all, I have been down this route. The 200-3397-00 is the only front cover that fully fits the 2225. Others have the same external dimensions but because the 2225 has fixed front feet, it is

Hello, in case anyone wants to use JWalling's services, I made a few pictures of the installation on my TDS754D: https://www.instagram.com/p/CFmbmA6jWdq/ Sorry for praising him so much, but I am