Identify an HP item? (Boonton RF Voltmeter) - UK Vintage Radio Repair and Restoration Discussion Forum

Julesomega · 12th May 2023, 10:35 pm

While googlin' for a picture of a Thorn dropper resistor, I found the interesting History of Thorn, and in there is a picture of the test setup used in 1967, with right in the centre an HP unit I don't recognise. Anyone know?

cmjones01 · 12th May 2023, 10:56 pm

Which HP unit do you mean? I can see a Tek 535A/545A/547 scope with a type M 4-channel plugin, a big Advance power supply, some sort of valve voltmeter, another power supply whose manufacturer I can't quite see, and some very in-house looking test equipment.

Chris

Julesomega · 12th May 2023, 11:35 pm

It looks like "some sort of valve voltmeter"

Trigon. · 13th May 2023, 12:29 am

Looks like a Boonton 91D RF voltmeter:

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(Image from: https://microscopetelescope.com/prod...decor-mcm-0973)

Cheers

factory · 13th May 2023, 2:46 pm

The Boonton Electronics Corp. (maker of the 91D above) actually had nothing to do with HP, it was Boonton Radio Corp. that HP took over, these are two of six companies making test instruments in Boonton New Jersey.
http://hparchive.com/boonton-nj

David

Julesomega · 13th May 2023, 3:03 pm

Well done chaps! Nice little unit, I want one (wife slaps wrist)
There are comments about these using a chopper amplifier with 'electrmechanical' choppers

12th May 2023, 10:35 pm	#1
Julesomega Nonode Join Date: Dec 2012 Location: Stockport, Greater Manchester, UK. Posts: 2,105	Identify an HP item? (Boonton RF Voltmeter) While googlin' for a picture of a Thorn dropper resistor, I found the interesting History of Thorn, and in there is a picture of the test setup used in 1967, with right in the centre an HP unit I don't recognise. Anyone know? __________________ - Julian It's good here Last edited by Julesomega; 12th May 2023 at 10:53 pm.

12th May 2023, 10:56 pm	#2
cmjones01 Nonode Join Date: Oct 2008 Location: Warsaw, Poland and Cambridge, UK Posts: 2,677	Re: Identify an HP item? Which HP unit do you mean? I can see a Tek 535A/545A/547 scope with a type M 4-channel plugin, a big Advance power supply, some sort of valve voltmeter, another power supply whose manufacturer I can't quite see, and some very in-house looking test equipment. Chris __________________ What's going on in the workshop? http://martin-jones.com/

12th May 2023, 11:35 pm	#3
Julesomega Nonode Join Date: Dec 2012 Location: Stockport, Greater Manchester, UK. Posts: 2,105	Re: Identify an HP item? It looks like "some sort of valve voltmeter" __________________ - Julian It's good here

13th May 2023, 12:29 am	#4
Trigon. Hexode Join Date: Jun 2018 Location: Buckinghamshire, UK. Posts: 387	Re: Identify an HP item? Looks like a Boonton 91D RF voltmeter: (Image from: https://microscopetelescope.com/prod...decor-mcm-0973) Cheers

13th May 2023, 2:46 pm	#5
factory Octode Join Date: Jul 2009 Location: Cheshire, UK. Posts: 1,733	Re: Identify an HP item? (Boonton RF Voltmeter) The Boonton Electronics Corp. (maker of the 91D above) actually had nothing to do with HP, it was Boonton Radio Corp. that HP took over, these are two of six companies making test instruments in Boonton New Jersey. http://hparchive.com/boonton-nj David

13th May 2023, 3:03 pm	#6
Julesomega Nonode Join Date: Dec 2012 Location: Stockport, Greater Manchester, UK. Posts: 2,105	Re: Identify an HP item? (Boonton RF Voltmeter) Well done chaps! Nice little unit, I want one (wife slaps wrist) There are comments about these using a chopper amplifier with 'electrmechanical' choppers __________________ - Julian It's good here