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I'm not sure I can identify the board. There are a couple of boards with no markings. I reseated the 4 boards on the left side while checking to see what they are. the left two are a memory board and

What is the voltage on pin 28 of the two socketed rams on the timing and control board in the bottom of the unit?

My 11801 arrived today. On power up it makes two beeps and puts up two lines of text on the screen: Diagnostics in progress Comm Test in progress But does not go past that. The seller sent a picture

I have had several requests to list all the tek portables that will be at stuff day, so here's the info. We will be checking these next week, so status on every unit is still unknown as of today

/g/TekScopes/photo/86536/11?p=Name,,,20,1,0,0 Probing pins 2 and 6 of U220 reveals square waves that are not symmetrical, should I be concerned and is there a adjustment

I've done exactly this to my 2430A. I've replaced both of the dead Dallas NVRAM chips with Cirrus FM18W08 FRAMs in off-the-shelf SOIC to DIP converters (Aries LCQT-SOIC28), all bought from Farnell in

If they are marked ZM or ZS they are well known to get leaky. Replace these diodes with MUR160 600V 1Amp from Mouser/DK.

Hi, Reg. Regarding fast pulses and such, there is a wealth of information at Jim Andrews' page here: https://kh6htv.com/pspl-app-notes/ He founded Picosecond Pulse Labs in 1980 and sold it to

Picosecond pulse labs used to sell NLTL's for pulse sharpening amonst other applications. NLTLs are still commercially available. Bruce

Reg, There might be a more elegant solution possible. The problem of battery ram was discussed at length in the pinball forums, and people made other solutions for it. Permanent ones. No battery to

To prevent that ground ring short, always practice safe probing; use a probe condom.? One of those plastic SMA connector caps works well, or just tape in a pinch.Jim Ford?Sent from my Verizon,

Nick, I have a 2246A that I had to get the ripple on the various DC busses knocked down. Replacing the ZS diodes was done, most of the secondary DC busses caps, a number of those were bad, I could not

I have one of Leo's 100 pS impulse units as a source for initial experiments. If I can narrow that to 10 -20 pS with discrete SMD parts I may be able to get the idea to work. There's a close

Nick, That is the way some of these threads go. You don't need a variac at this stage. A while ago you mentioned you had an isolation transformer, as I recommended and you asked whether to connect the

[email protected]> wrote: I'm happy to report that a kind gentleman member of this list had some parts he shared with me. I've transplanted the probe to a new housing and the patient looks to have

In my experience, the main transformer either works, or it doesn't... and yours works. Having an internal short to ground is what killed the few T2204's I know about. There are about 17 one amp ultra

It was suggested earlier this this thread that I should find 160-170VDC across C2202. I tested across R2256 as they appear to share the same connections, and got 156VDC. Next I checked for ripple

Chris, I think you refer here to the so-called "nose-to-nose" method of characterizing sampling scopes (Rush e.a.). Albert

Reginald, To obtain significant NLT compression, you need lots of stages, and a fast and big enough signal to start with - not easily done with conventional electronic and transmission line

OP here. Variacs weren’t mentioned until today so perhaps you are confusing me with another user. But you are correct that this is starting to feel overwhelming and I am losing confidence :( This is