The pics pretty much tell all. I used a flick of finger and Xacto handle to tap the bulb.
The G came up irrespective of mounting. This particular Jj is one of my primo test tubes. But noticed it felt like a tuning fork if set down on table.
I remembered the Snark so here is. Maybe not a new idea but I have not seen this used before.
The G came up irrespective of mounting. This particular Jj is one of my primo test tubes. But noticed it felt like a tuning fork if set down on table.
I remembered the Snark so here is. Maybe not a new idea but I have not seen this used before.
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So G# was the measured, and perhaps actual natural frequency of that valve (along with the mass of the Snark) when vibrating from its mounting pins in the socket.
You could use it for microphonic abatement design, although that needs a little awareness of what you are measuring and how to use that measurement.
If you were keen to go further with your snark then the linked article may help:
https://www.dalmura.com.au/static/Microphonics%20in%20valves.pdf
You could use it for microphonic abatement design, although that needs a little awareness of what you are measuring and how to use that measurement.
If you were keen to go further with your snark then the linked article may help:
https://www.dalmura.com.au/static/Microphonics%20in%20valves.pdf
That particular tube had a noticable physical resonance that persisted for 1-2 seconds. That is just by picking it up or setting it down you could feel it.( like a tuning fork)
Possibly it had been dropped some point in its lifetime. But it does pass ok in circuit. I would not use it for example in a combo unit.
In a hifi preamp it may be ok.
Possibly it had been dropped some point in its lifetime. But it does pass ok in circuit. I would not use it for example in a combo unit.
In a hifi preamp it may be ok.
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