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| Do you have any test equipment in your lab that uses vacuum tubes? |
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| BravoV:
The only one in the house, Heathkit vacuum tube voltmeter, a freebie meter. |
| Psi:
I have an old graph paper servo plotter that uses tubes around somewhere. And i saved a magic eye valve from going to the rubbish tip a while back. Not sure what project i'll use it in. |
| tautech:
--- Quote from: Psi on September 09, 2019, 09:58:51 am --- And i saved a magic eye valve from going to the rubbish tip a while back. Not sure what project i'll use it in. --- End quote --- Gave the only one I've ever had to member Neo in the US as I'll never use it. He had some project but has never disclosed what. :-// Still got a box of assorted tubes that I really must throw out unless you want them ? |
| Psi:
--- Quote from: tautech on September 09, 2019, 10:08:03 am --- --- Quote from: Psi on September 09, 2019, 09:58:51 am --- And i saved a magic eye valve from going to the rubbish tip a while back. Not sure what project i'll use it in. --- End quote --- Gave the only one I've ever had to member Neo in the US as I'll never use it. He had some project but has never disclosed what. :-// Still got a box of assorted tubes that I really must throw out unless you want them ? --- End quote --- Only if there's some 12AX7 or EL34 in there. ;D |
| amspire:
I have an ESI precision capacitor measuring transformer bridge that uses valves in the tracking oscillator and null detector. The null detector has a sharp bandpass filter that tracks the oscillator over a range of about 20Hz to 20KHz. Some of the vacuum tubes do not seem to be easily available. If it starts to fail, I think I might keep the meters, dials, resonant passive components and precision coupling transformers, but replace the valves with a solid state circuits. Maybe make it battery powered. I also have an old 5MHz BWD oscilloscope that is a transistor-valve hybrid - haven't used it in decades. It was my first scope and I just never felt like getting rid of it. Fantastic triggering. A basic valve RF oscillator and Vacuum Tube Voltmeter. They could end up being converted to solid state. Richard. |
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