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Hello, I am trying to fix a 71100A spectrum analyzer and I'm stuck. It passes the "analyzer test" built into the firmware but does not pass calibration of the resolution bandwidth for some of the

Oops? I looked up the meters in the 608D manual and I find that the two are not identical. The RF level is 50 uA while the modulation is 1 mA. Unfortunately I need the RF level for the 608. In the

1959. the instruments are shown in the HP 1963 catalog.

I think the oscillator is okay but I will take another look. If it's weak I'd expect no output on some frequencies, which isn't happening. Bob

Hello-- In case anyone needs a replacement, I'm offering FS a NOS (new-old-stock) "Percent Modulation" meter, HP p/n 1120-0397-1, 1 mA full-scale movement. This meter bears a corporate calibration

It was some time in the 60s but I have no idea of the exact year. Regards. Max. K 4 O DS. Email: max@... Transistor site http://www.funwithtransistors.net Vacuum tube site:

I didn't know there was a Boonton group. I'll check it out. Regards. Max. K 4 O DS. Email: max@... Transistor site http://www.funwithtransistors.net Vacuum tube site:

Wow. I didn't know HP bought Boonton. I always liked Boonton instruments, probably because I was born in Boonton. When did HP buy them? Dave

What's this? You replied, simply quoting my message. Did you plan to comment? Bob

Also ask on the Boonton Group. -John ==========

I am looking for a couple of HP oldies. The 260A Q meter and the 250A RX meter. I can't find any on eBay. These two instruments were carried over from Boonton when HP bought them

Thank you all for your inputs.

I'll give that a try. Thanks. Regards. Max. K 4 O DS. Email: max@... Transistor site http://www.funwithtransistors.net Vacuum tube site: http://www.funwithtubes.net Woodworking

The low ohms 4-wire for the HP3456A is excellent. I've 2 of the HP3456a, one in cal from a medical company in Minnesota cost me $200, another from an auto-electronics firm in michigan was only $50.

Max, I too had the sticking meter syndrome. It's easy to repair. You remove the meter (two panel screws and two connection nuts) and then take the front bezel off. There is a tiny screw adjustment

Dpoug wrote. Some years ago, I was at a ham flea-market and found a nice Tek scope cart. I asked how much, and was told that I had to take "this" with it, and it was $25. "This" was an HP608E. So I

What a remarkable coincidence. I have just come back on the list after being on no mail for some time. Most of you are working on somewhat newer things than I am. I just finished putting a 606B and