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We'll complete the circuit by adding a lamp in on the way back insert the meter, Circuit Diagrams Using Circuitikz;.
Grid-dip-meters Philips GM 3121 Grid Dip Meter. Note the Type 4662 indicator valve, this is a very old neon indicator which was used as magic eye in some receivers
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audio > vacuum tubes > Construction 25W single ended Class A tube ... Construction 25W single-ended Class A tube amp circuit diagram EL156 - schematic
POWER QUALITY METER AND METHOD OF WAVEFORM ANAYLSIS AND COMPRESSION ... POWER QUALITY METER AND METHOD OF WAVEFORM ANAYLSIS AND COMPRESSION - diagram, schematic, and image 01