Reflex Valve Voltmeter - UK Vintage Radio Repair and Restoration Discussion Forum

Norm_N_Tam · 29th Jul 2014, 3:43 am

The January 1930 issue of Radio Broadcast magazine had a brief article about a Reflex Valve Voltmeter circuit titled 'A Reflex Vacuum-Tube Voltmeter' on page 173. The January 1930 issue can be found here:

http://www.vacuumtubeera.net/RadioBr...16-1930-01.pdf

The article, which was much too brief, made reference to the November 1926 issue of Experimental Wireless and Wireless Engineer magazine, which was said to explain the circuit in more detail. Is there any way, someone could scan that article so it may be read online? Thank you to anyone who can help!

Norm_N_Tam · 4th Aug 2014, 7:35 am

I have found a good description of the Reflex Valve Voltmeter here:

http://www.tubebooks.org/Books/rider_VTVM.pdf

It starts on page 51. The book also shows a Reflex Valve Voltmeter using an acorn valve, which looks like a very interesting circuit. The valve is actually built into the probe!

I hope you enjoy reading this as much as I have.

pmmunro · 16th Jan 2016, 4:45 pm

Thanks for the link to the John F Rider book which I found while trying to find the Experimental Wireless & Wireless Engineer Article in your first post.

In the Author's Foreword to the first edition he states "The Vacuum tube voltmeter, since its inception in 1895, has developed into one of the most valuable aids to the electronic research worker".

Had you noticed that and can you shed any light on how that statement could be valid since there were, as far as I understand, no vacuum tubes in 1895, nor was the concept understood? I have looked through the bibliography but didn't find anything to explain this statement.

PMM

29th Jul 2014, 3:43 am	#1
Norm_N_Tam Triode Join Date: Feb 2007 Location: Wiles-Barre, PA USA Posts: 34	Reflex Valve Voltmeter The January 1930 issue of Radio Broadcast magazine had a brief article about a Reflex Valve Voltmeter circuit titled 'A Reflex Vacuum-Tube Voltmeter' on page 173. The January 1930 issue can be found here: http://www.vacuumtubeera.net/RadioBr...16-1930-01.pdf The article, which was much too brief, made reference to the November 1926 issue of Experimental Wireless and Wireless Engineer magazine, which was said to explain the circuit in more detail. Is there any way, someone could scan that article so it may be read online? Thank you to anyone who can help!

4th Aug 2014, 7:35 am	#2
Norm_N_Tam Triode Join Date: Feb 2007 Location: Wiles-Barre, PA USA Posts: 34	Re: Reflex Valve Voltmeter I have found a good description of the Reflex Valve Voltmeter here: http://www.tubebooks.org/Books/rider_VTVM.pdf It starts on page 51. The book also shows a Reflex Valve Voltmeter using an acorn valve, which looks like a very interesting circuit. The valve is actually built into the probe! I hope you enjoy reading this as much as I have.

16th Jan 2016, 4:45 pm	#3
pmmunro Octode Join Date: Jul 2004 Location: Dundee, UK. Posts: 1,813	Re: Reflex Valve Voltmeter Thanks for the link to the John F Rider book which I found while trying to find the Experimental Wireless & Wireless Engineer Article in your first post. In the Author's Foreword to the first edition he states "The Vacuum tube voltmeter, since its inception in 1895, has developed into one of the most valuable aids to the electronic research worker". Had you noticed that and can you shed any light on how that statement could be valid since there were, as far as I understand, no vacuum tubes in 1895, nor was the concept understood? I have looked through the bibliography but didn't find anything to explain this statement. PMM