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Old 5th Aug 2022, 9:45 pm   #1
alanjam
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Default What is it?

I've inherited the device in the attached picture from my ex EKC0, MEL, Philips engineer father-in-law.
Within are two ECC81 valves. The magic eye is labelled "Power Factor". The case is very similar to another which I have with a Marconi label on it.
Any ideas?
Alan
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Old 5th Aug 2022, 10:15 pm   #2
joebog1
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Default Re: What is it?

Looks like a capacitor tester, but I am only guessing.
I DO like the centre punch marks on the front "panel ". I have never thought of that and have been playing with this stuff for more than 60 years DUH!!. Might also be a mesurement set for transformers/coils.


Joe
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Old 6th Aug 2022, 6:52 am   #3
Diabolical Artificer
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Default Re: What is it?

As Joe says a cap tester, power factor is olde English for ESR I think.

Andy.
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Old 6th Aug 2022, 7:42 am   #4
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Default Re: What is it?

Most probably a component-measuring bridge. 'Power factor' indicates it's an AC bridge. It could be for inductors, capacitors or both.

Power factor, Q, D (Dissipation factor), Lossiness, Equivalent Series Resistance, Equivalent Parallel Resistance are all different ways of expressing the same thing, power loss in a reactive component which should, ideally, be lossless. Once you know any one, you can convert it to any of the others.

Different industries and fields of electrical science prefer one version over the others, because it makes something easier or more obvious in that field, but it's still all the same thing expressed in different ways.

Power factor is heavily used in power distribution. Q in the RF world.

A bridge would have one pot for nulling to find the reactive component L or C, and a second pot to find the resistive component. Only by nulling on both pots alternately do you find the deepest null.

David
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Old 6th Aug 2022, 9:45 am   #5
joebog1
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Default Re: What is it?

I would suggest, that the bottom control with scale, is a variable cap as its travel is only 180 degrees. Yes I know there are pots that do this as well, it still adds up to a null control.
I would be VERY interested to see the circuit. I imagine one valve ( two halves ) will be an oscillator and buffer to reduce impedance, the second pair of triodes will drive the null on the magic eye. Most magic eyes are rather lazy when it comes to sensitivity after all.

Just thinking out while typring.

Joe
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