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Greetings! I made a little progress. One of the delay lines was open. Perhaps that was my interment problem. I fixed that and got CH2 displaying. The problem is (as before I lost both traces) that

Ozan, J1350 is correctly positioned. Q4660B and Q1462B are +0.672 Q1460E = -0.42 Q1462E = -0.42 Q3237E 4.2 Q3237B = 3.525 Q3237C = 0.184 Q3236E = 4.288 Q3236B = 3.623 Q3236C = 0.151 Thank

Both scopes have found a new home now. Thanks to all who showed an interest.

My comments are inline. Ozan Most likely the delay line is made of a lossy coax (there is an explanation in Tektronix technical series) and it has some resistance from end to end. Shorting at the

The condition of t; his SC504 has changed. I am currently unable to see a trace from either Ch1 or Ch2. From the beginning I have been seeing an intermittent problem of not seeing either channel. If I

I was asked to clarify, my above email was about Bill/William vel Liam Perkins <cheater00social@...> wrote:

Not a list but a good description of how to care for an old 49x analyzer including PSU recapping: Look for "Service Notes for the Tektronix 49x/275x Spectrum Analyzers (650KB .PDF, 28 pages) " on

Hello Bruce, The option 9 increases the low frequency display range down to 1 KHz by replacing the included standard cable with a special one, Tektronix part number 174-1338-000. Rubens,

Keep in mind, of course, that a patent is only a license to sue.? A patent holder would need to be able to prove infringement, have enough wherewithal for lawyers' fees and court costs, and have the

Confirmed: In the horizontal slot, connecting pin A1 (Gate) to pin A8 (+5V) un-blanks the CRT, and a dot appears near the center of the screen. Now it is possible to plug in ANY suitable plugin into

Yep, Bruel & Kjaer for sound and vibration measuring instruments, now part of HBK (Hottinger Bruel & Kjaer), and B&K Precision (ownership changed many times - big surprise!), for power supplies and

I'd be happy to re-home one, particularly the non-working one. I'm always up for a fun project if it's got Tektronix written on the front! :D - Scott

Scope seems to be in "chop" mode based on the position of "Display" knob. Are you applying the same signal to both channels? You could be seeing Ch1 and Ch2 together, I see that triggering is on Ch2,

Anode of CR1457 is the same node as collector of Q1455. Seeing -0.37 to -0.65V doesn't have an easy explanation when collector of Q1555 is ~ 1V. What voltages do you see at Ch2 hybrid, HY1430, pins 1,

Not only does the Horz plugin in provide the sweep signals it ALSO provides the positioning as well as blanking disable. In the absence of signal the dot is there but it is pulled off the side of the

It's looking like it's pin A1 ("gate"). In the 7A17 (which unblanks the CRT, but does NOT provide a "sweep"), pin A1 is tied to +5 coming in from pin A8. In a typical sweep plugin (such as 7B50), pin

It just occurred to me that the REASON removing the horizontal plugin blanks the CRT is (probably) because a normal "sweep" plugin needs to support retrace blanking, and (I'm now thinking) that the

One can find PDF copies of the Tektronix "Concept" and "Measurement" books on TekWiki: https://w140.com/tekwiki/wiki/Concepts_Series DaveD KC0WJN [email protected]> wrote:

"The software was made by a Danish Engineer, who gave it away on the forums as freeware. I think this was the mistake of his life." I'll share my story - we also made the mistake of our lives! In

Get Tektronix Circuits Concepts books on basic of oscilloscopes. On eBay find any 7Bxx horizontal plugin Jon