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Barry check SN scope vs manual, changes pages, end of,service manual Jon

What reference point are you probing from? For now, forget the scope and do some DC DVM measurements while it's running. Clip the + lead on TP940, and leave it there for the following

I have checked (and replaced for good measure) Q938, Q939, and Q944. The base resistors R946 and R947 are fine too. One weird thing I've noticed is that the voltage on the emitter of Q944 is

The Vertical Interface in a 7704A (Schematic 5) has two potentiometers, R2234 and R2284, connected to the LEFT & RIGHT VERTICAL PLUGIN_SELECTOR IC (U2230 - a 0022 chip) for which I can't find any

The boards say (c)1978 so I’m thinking 1979 low serial is probably closer.

Did you check or replace Q944? It's possible for it to be damaged during output transistor failure. If Q944's B-C junction blows open, it's possible for Q939 to supply enough base drive through R944

The 107437 is a Tektronix Guernsey numbering - unrelated the Bxxxxxx number from Beaverton - I imagine there's a correspondence but I doubt it was documented. You best bet is to compare the board

I all. I am a lucky owner of an old DSA602 From tektronix. It work fine but the batteries (Memory and CPU) are tired. On power up, the scope show an battery error. Is anybody know what type of

The scope shots in the last post were taken on the output I probed the collector and emitter voltages and it looks like the transistor is in

I replaced the transistors with a more matched pair (hFe for both transistors was 73 at a Vbe of 550 mV). The circuit still does not start up reliably. There is another mode of oscillation at a few

Just got the pictures from the seller, it is the old type/brown one. So not sure where to go from here and if it even make sense to start restoring it or sell it for parts (again)..

On Tue, Feb 13, 2024 at 07:59 AM, Tom Phillips wrote: "...The "high" serial numbers for the 465B are S/N B0600000 and up..." That should read "B060000 and up." Apologies for the typo. I sure wish we

Local pickup would be ideal. I'm told there is more Tek stuff, but I haven't seen it yet. The owner now knows there's interest, so there's likely to be more info soon. -- Jim Adney Madison, WI USA

And I THOUGHT I had also set that up in my sig file, but now I see that it's not there. Now it is. -- Jim Adney Madison, WI USA

On Tue, Feb 13, 2024 at 04:19 AM, Don - AC2EV wrote: "How does one tell if the scope is a low serial number or a high serial number? My unit is #107437 as indicated on the front face. There’s no

I'd very carefully drill it out.? You might find that they glued the tab on the shaft.? I haven't tried to remove this kind of tab, but that's what I likely do. Harvey

You won’t be happy with the results of a “cheep 3D Printer”.

Greetings All, I have been using JLC3DP.com for printing my parts. Their quality and available processes are very good. They can print 316L stainless steel. Very good stuff! The pull tab parts are

Adam: Thanks for the link, Very nice looking replacement latch parts. I was unaware of the inner parts, although only needed for a full replacement As for the pull tab part, I made a bunch of these

How does one tell if the scope is a low serial number or a high serial number? My unit is #107437 as indicated on the front face. There’s no letter indicator.