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Dear Mike, bravo for the duplication of Dr Middlebrooks techniques. We are of same vintage as I knew Middlebrook and his collaborator Slobodan CUK very well. We had visited at their Caltech Pasadena

Thanks Jon, Well, I think I have the normalization factor figured out. ?It does limit the usefulness. ?I am going back through my old papers and videos from Dr. Middlebrook (went to his seminar in

Mike: VERT OUT is NOT intended to duplicate 1A1 or other old PU. Its main use is to cascade VERT OUT to same scope other PU Vert CH 1 IN. See OP and SERV manual for scope you have for exact spec as it

Ozan, I will have to look into that.? I have never used a 1A1 but only saw it used in an application.? The Ch2 only output doesn't work in my application as I need Ch1, Ch2, and Ch1 - Ch2 (inverting

On Thu, May 16, 2024 at 08:05 AM, mike zias / W3JRR wrote: > > Hello Jon, > I don't need Full BW so I use the 1 meg input. > Just to be sure I have this straight: > Using another scope to view

Hello Jon, I don't need Full BW so I use the 1 meg input. Just to be sure I have this straight: Using another scope to view Vert.Sig.Out, full scale on my 7623A (8div) will map to full scale on the

7904, 7104 and many other mainframe 7000 Tektronix scopes have the vertical signals out, some on front panel some on rear. Need the 50 Ohm term for specified bandwidth Jon

John, thank you - that makes sense.? Too bad Tek didn't give this feature in later scopes. mz

Mike, The screen is divided into 8 vertical divisions.? A full scale (8 division) peak-to-peak waveform on the screen should generate a 4 volt peak-to-peak signal at the VERT SIG OUT jack. --John

Hello John, I don't understand that specification. ?What division is being referenced? ?However, somehow that spec. must translate to the division I am seeing.

Mike, On the similar 7603A, the VERT SIG OUT is specified as 0.5V per division of deflection into 1MEG, 25mV per division of deflection into 50 ohms. --John Gord

I am using the vertical signal output (back panel) on a 7623A. ?It seems to have a 2:1 attenuator. ?I am measuring the output with a 1 meg input on another scope and find I get 1/2 the signal going

Stand down.? Found enough to proceed.

All I can find online is the Operations manual for the LA-501. I have both early and late versions needing a look at, and schematics would be most helpful. Going to be a bit of work since they are

Thank you all for the replies. The problem seems to be related to the beam finder switch wich was "always on". However, I broke the plastic part that open/closes the switch while I was trying to screw

Thank you for your reply Ozan, I found one old Tektronix Reference document about the min and max loads that I have uploaded to the files section (

I recently got a 453 that needed some work that I got going good but it’s missing the rear cover plate. It’s the early version that takes the separate power cord. If anyone has a parts unit with a

======== Hi Roger, What I meant is if the +130V measures within target, while loaded in the mainframe , then no need to touch it. First PSU needs a minimum total load so that switcher section works in

Thank you for your reply Ozan, But I still don't understand why there is a minimum load requirement for the +130 rail, as suggested by Morris. According to your explanation, if it measures ok, I think

==== +130V is the main voltage switcher regulates, all other pre-LV regulator voltages (+7V, +54V, etc.) depend on +130V being correct. ?It is sensed at the top of R1292 and adjusting R1293 to set