Tone generator and
Audio millivoltmeter |

Rörvoltmeter = Vacuum Tube Voltmeter
Sinusvågsgenerator = Sine Wave Generator |
This was made from two different articles but I decided to
build them into one cabinet.
It is now more than 40 years since I put it together. |
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The Decade Tone Generator designed by my friend Jon Idestam-Almquist.
From an article in "Radio & Television" April, 1965. |
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The Vacuum Tube Voltmeter, also designed by Jon Idestam-Almquist
From an article in "Radio & Television" March, 1963. |
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The voltmeters original appearance... |
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...and its interior. |
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Inside my version... |
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...close-up of the switches with components for frequency selection. |
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The voltmeter part... |
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Bottom view with all nice old resistors and capacitors. |
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The THD is just below 0,1 % (< -60 dB) |
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