PT54 (Hivac Z220 Harries) beam tetrode
- Made:
- London
- maker:
- Hivac Limited
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LicenseBeam tetrode, P.T. 54 (Hivac Z220 Harries)
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Beam tetrode, P.T. 54 (Hivac Z220 Harries), made by Hivac Limited, aka the High Vacuum Valve Company, London.
