MAK's Old Radio Pages
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2004 All rights reserved; updated Apr 24, 2004
CR-2 receiver, possibly modified
The CR-5 was a single tube regenerative receiver. A companion 2-tube RORK audio amplifier (and other amplifier options) were available to allow the CR-5 (or other similar sets) to be used with a (horn) speaker.
The CR-9 integrated the capabilities of a CR-5 and a RORK amplifier, forming a complete 3-tube receiver. Note the recess in the hinged lid (upper right corner). This allowed for the additional height of earlier "tipped" tubes.
The MU-1 Synchrophase was a neutrodyne (neutralized TRF) set representing a departure from the regenerative CR series. Earlier Synchrophase sets used 3 completely independent tuned stages. The later version included selectable mechanical coupling of the 3 tuners, implemented through a chain drive mechanism. Clutches on the outside tuners allowed them to be mechanically coupled to the center tuning capacitor, or decoupled for fully independent tuning.
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