Products > Test Equipment

Do you have any test equipment in your lab that uses vacuum tubes?

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vk6zgo:
 I often wonder why HP call the 410C an "Electronic Voltmeter", as it can read Resistance & Current as well.
Still, I suppose other "VTVMs" can do similar things.

Now, this is a "Vacuum Tube Voltmeter"!
https://www.ietlabs.com/pdf/Manuals/GR/726-A%20Vacumm%20Tube%20VM.pdf
It was "AC voltages only"----How does that probe grab you?

I had one for years, until, in a misguided "Nice guy" moment, I donated it to an Electronics Museum.
They had a wonderful assortment of stuff, so I wasn't worried that it wasn't yet displayed.

Years went by, & the decision was made by the "powers that be" to dedicate the museum to the early spark radio equipment used by the coastal radio station that originally occupied the site.
To this end, all the other stuff was "cleared out".

Where to? -----Dunno, maybe landfill!

med6753:

--- Quote from: vk6zgo on September 11, 2019, 04:19:52 am --- I often wonder why HP call the 410C an "Electronic Voltmeter", as it can read Resistance & Current as well.
Still, I suppose other "VTVMs" can do similar things.

Now, this is a "Vacuum Tube Voltmeter"!
https://www.ietlabs.com/pdf/Manuals/GR/726-A%20Vacumm%20Tube%20VM.pdf
It was "AC voltages only"----How does that probe grab you?

I had one for years, until, in a misguided "Nice guy" moment, I donated it to an Electronics Museum.
They had a wonderful assortment of stuff, so I wasn't worried that it wasn't yet displayed.

Years went by, & the decision was made by the "powers that be" to dedicate the museum to the early spark radio equipment used by the coastal radio station that originally occupied the site.
To this end, all the other stuff was "cleared out".

Where to? -----Dunno, maybe landfill!

--- End quote ---

Powered vacuum tube probes were quite common in the 1950's. Today's equivalent is an FET probe.

vk6zgo:

--- Quote from: med6753 on September 11, 2019, 04:39:26 am ---
--- Quote from: vk6zgo on September 11, 2019, 04:19:52 am --- I often wonder why HP call the 410C an "Electronic Voltmeter", as it can read Resistance & Current as well.
Still, I suppose other "VTVMs" can do similar things.

Now, this is a "Vacuum Tube Voltmeter"!
https://www.ietlabs.com/pdf/Manuals/GR/726-A%20Vacumm%20Tube%20VM.pdf
It was "AC voltages only"----How does that probe grab you?

I had one for years, until, in a misguided "Nice guy" moment, I donated it to an Electronics Museum.
They had a wonderful assortment of stuff, so I wasn't worried that it wasn't yet displayed.

Years went by, & the decision was made by the "powers that be" to dedicate the museum to the early spark radio equipment used by the coastal radio station that originally occupied the site.
To this end, all the other stuff was "cleared out".

Where to? -----Dunno, maybe landfill!

--- End quote ---

Powered vacuum tube probes were quite common in the 1950's. Today's equivalent is an FET probe.

--- End quote ---

Certainly!----The 410C has one, but the tube in their probe was a lot smaller than the full sized "lighthouse" tube in the 726A probe!
The large probe was always a problem when looking at 1950s/60s Electronics.

The only time I really found the 726A useful was for aligning AM radios (used in conjunction with my portable one valve "signal generator").
It would have been better, though, if it had a DC range, as I could have looked at the receiver AGC instead of audio out.

It did look really cool, though!

ferdieCX:
When I was student in the 70's, we used a 726A VTVM in the lab at the technical university.
It still is in our warehouse, waiting to be restored.

vk6zgo:
I always had a bit of a "soft spot" for General Radio equipment.

At 6WF/WN in Perth, in the "Speech input room" at the Tx site, we had GR Audio generators, when I first worked there.
They had a "mechanical digital" frequency display--- when you turned the frequency control, plastic pieces with numbers on them clicked into place behind a viewing window, where they were illuminated from the rear.
It was quite different from the ordinary "rolling" mechanical display used on hour meters & the like.

i ran into quite a lot of GR stuff over the years, but most of it was more esoteric stuff, which spent more time packed in beautiful polished wooden boxes than ever being used!

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