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Jackson 658
Dynamic Output Tube Tester
Made in USA by Jackson Electrical Company ( Dayton, Ohio)
The Jackson Electrical Company made during 1950’s and 1960’s various emission testers, as the Model 49, 648 and finally the 658.All the models are based on the original Jackson's idea of “Dynamic Plate Conductance” instead of the mutual conductance concept. The ammeter is inserted in the plate of the tube under test, in absence of complicated switch and control settings, using 'proportional AC voltages'.
La Compagnia Jackson Electrical (Dayton,Ohio) ha costruito durante gli anni 50 e 60 vari provavalvole ad emissione, quali il modello 49,648 e infine il 658. Tutti gli apparecchi si basano sul concetto originale Jackson della conduttanza dinamica di placca in luogo della mutua conduttanza. Lo strumento di misura della corrente è infatti inserito direttamente sulla placca della valvola in esame, in assenza di controlli e regolazioni complicate, usando voltaggi in CA proporzionali.
From the Jackson 658 original manual:
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The model 658 has the following functions:
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Line-in control |
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The Heater, Plate and Grid voltage controls. |
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The unit is equipped with a double row sequence switch for the tube set-up:
The roll-chart :
LINK
Jackson 658 – Rebuild and Calibration Instructions by Erik Knutson
Version 1 – : http://dynakam.com/arf_members_web/jackson658_cal.html
Version 2 ( June 2005) : http://www.dynakam.com/arf_members_web/jackson658_cal_rev2.html
Are available on request :
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