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I am 72. I pulled a Hammarlund SP-600 of the shelf to test and could not get a sound out of it. I went so far as to hook a signal generator to it and started tracing the signal through the unit.

As I reach 70 its becoming clearer that I will age out before I get to all the HP and Tek gear on the “to repair” shelves in my shop. ?I do appreciate the “smells” ?of the boat anchor tube

Every few months I like to fire up the seldom used HP gear on the workbench.? I really love listening to the Pratt and Whitney jet engines used to cool my HP 8345A.? Being elderly and getting deafer

Hi in your case from 238-247 if you haven’t done it already ..201 onwards backing up correction constants One thing to check is the level of your LO feedthrough amplitude ..the signal at 0hz on the

got it and will start reading. Any recommendations about what paragraph? Gr Kees Op za 18 mrt 2023 om 18:19 schreef Mike Lockley via groups.io <mikelockley= [email protected]>:

You need 08590-90316 from 2001 8590 series Service Guide Are large tome but worth downloading or buying Regard’s Mike g4wam Sent: 18 March 2023 14:41 To: [email protected]

Hi, Are we talking about the user manual 08590-90301, because there is not much cal data in it other than the normal stuff. I also have the installation, verification & Operation manual. Or are there

This is now leaning towards a YTO failure—not good. Definitely do the CAL tests as per the user guide though Mike Sent: 18 March 2023 12:49 To: [email protected] Subject: Re:

Hi, for laughs and giggles I just did a new cal and now I got a GAIN FAIL op the AMPTD. Gr Kees Op za 18 mrt 2023 om 11:11 schreef Mike Lockley via groups.io <mikelockley= [email protected]>:

Video of what’s happening? https://youtu.be/JLgLmBeL2mg ( https://youtu.be/JLgLmBeL2mg )

Just a thought - started with my 8591E losing low end cal signal response with remaining good readings on the high end.? It was the result of a dying YIG.? Started out initially slowly but gradually

I posted my inquirey on the Wavetek side as well, with some more pics: /g/Wavetek-test-equipment/topic/97629517#69 Its more on-topic there (Wavetek bought W&G), but a lot less folks

Hi there, The key to this is that the problem is below 10mhz. The first calibration point is at 12mhz. From what I remember the FM coil in the YTO does the below 10mhz steps. The main coil in the YTO

Right. The problem is that there are no photocells in today’s equipment, so even googling for “photocell” gives you results for “photoresistor” (= LDR, Light-dependent resistor) [1]. Common

Brad, that rather sounds like an LDR than a photocell to me. You can find them very cheap on eB in different types and sizes. Just give it a try and let us know... Chris

I think that is most likely true. I haven't seen your circuit, but the one I'm familiar with wuse 24v to switch the couls, but uses 5v for control. If that is the same in your case, that is the

I am just about done resurrecting a E4407B that I just acquired. The last issue is the RF step attenuator. Stepping from 0dB to 25dB in 5 dB steps works fine. All steps above 25dB fail. I suspect that

I'm starting to have a pretty good understanding of how the electronics supposed to work, at least most of it, but unfortunately I believe all 4 of the logic chips on mine are dead. I suspect the

Hi This has all the signs of a bad solder joint or connector, G Edmonds

Hi All, I came into the possession of a 8591E and after calibration, I found out that when I connect my marconi 2019A to the SP and set it to 1Mhz and 0dBm the peak is hardly to see amongst the noise,