The only info with real specs I found on this topic is an old Motorola/ON App note, AN-1040D, it does discuss these anodized transistor insulators towards the end of the article. you can find it from ON semi here:

https://www.onsemi.com/pub/Collateral/AN1040-D.PDF

I would not be so keen to use these older anodized insulators in actual life, I see zero advantage compared to more
modern techniques, and I doubt the voltage breakdown is as good as even poor film, pads or mica.
all the best,
walter? (walter2 -at- sphere.bc.ca
sphere research corp.

I have the correct cable. I used it about 8 years ago. It worked. I'm starting to think there may be an issue with the 8924

The swept sine is very nice to have.? I paid them $1500 for the option upgrade.

As with the 35665A, when you ordered an option upgrade, they sent you a disk with the code to enable it on your serial number.

The analyzer's serial number and firmware options are stored in EEPROM (U27)

If you can find a suitable 'donor' image, you can replace or reprogram your EEPROM to add all the options.

"I am allergic to all measures in DB"

Maybe this will help:

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That's always the first place that I look... The latest he has is for 1532A.

Hal

hello,

News from the internal attenuator of this 8558B HP
As this is a mechanical attenuator (Action of a rotary button only), I did this little test.
Disconnect in and out attenuator.?it is autonomous now
Sending a sinusoidal signal 10 MHZ with a generator via a resistor of 50 ohm
Oscilloscope measurement input and output.

As I turn the button, the signal drops out (constant input).
The method is not very academic and I am not amused to convert to DB.?I am allergic to all measures in DB (LOL)

I think it works, because it’s a constant decay, even if you only see a few millivolts 3 notches before the end of the rotation. (For only 0.3v input)
I did not want to force too much the signal to the enter?
I think it’s not burned, so I’m gonna look at something else

cdt

Greetings to all,

I am still seeking any service information and? service manuals? for

HP 3805 Distance Meter
HP 3810 Total Station

These are land surveying instruments and I am really impressed by their construction.??
I have the operation manuals.

I have many vintage items of HP equipment and really enjoy using them.

73 Gordon WA4FJC
gpbatey compuserve com

I have a IFR that had some PS issues due to a cap shot in the?
output amp, all that is cured.
This unit was pretty well behaved right up to 530 MHz send and receive,?
crisp CRT, keyboard works, right on the money level and freq wise, sensitivity, measurements etc
after 530 MHz would appear to be out of lock.

Tried to align high loop but do not have the TF 30 mentioned in the service manual,?
tried to wing it, now lots of? spurs.
Any suggestions on a TF 30 work around, or I would pay someone to do this alignment
as I am short on time,
Regards,

Mike
402 510 2040 for you old school guys

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Does anyone have any information on where to find a service manual for a late model 5340A?? The latest that I can find (and have) is for SN 1840A and above with change sheets out to 2012A, yet I have one with a SN of 2532A and a couple in between.? Did HP ever make later manual revisions, or only change sheets?? Either would help me, so TIA for any pointers.

Thank you,

Hal

Thanks everyone. The cap seems to have some sort of positioning arrow
that indicates either 120 or 240 mains AC. But I guess that doesn't
matter.

I have not had any luck with finding this upgrade through Keysight here in Australia.
Mark

I'm going crazy here. I've got a bunch of these high thermal conductivity hard-anodized aluminum TO-3 transistor mounting insulators salvaged from old gear, and planning to use some. I figured I'd check the thermal conductivity specs on line, and be done. I quickly found they are likely Thermalloy brand type 4703A, 4720A, or 4726A (same deal but slightly different outline sizes), with drawings and such, but no thermal specs. I can't seem to find any specs for these anywhere, just lots of pictures and references and ones for sale, but no useful info. Thermalloy apparently disappeared into a conglomeration some time ago. There's stuff floating around, but somehow it escapes me - maybe a mental block or 24 hour insanity. I even found the alumina types and specs, but no anodized. Somebody must still use and make these things. Or maybe all old/obsolete package stuff has disappeared for some reason.You'd think at least the old data sheets would be out there. The only outfits I recall from the old days are Thermalloy and Wakefield, and can't seem to spot anything useful on the later either. I just downloaded a recent Wakefield-Vette (now called) catalog, and they seem to be almost entirely about heatsinks and greases, and no hardware except some Kapton insulators.

Anyway, does anyone have this sort of info, maybe in old catalogs, or know where to look? All I need is the thermal resistance in simplest form deg C/W in TO-3 configuration.

Ed

>>? Joe Smith formerly of Omaha ?

Sorry.

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