Standard Radio Corp.
model - "Multivalve"



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Standard Radio Corp. (Worchester Mass.)
model - "Multivalve" ca: 1926



When found, this piece was was meticulously cared for or if it was refinished, it was done professionally. The paper rear instruction label was badly damaged, so I created a reproduction.

The Multivalve is a one tube receiver using one of the earliest (and quite rare) multi section vacuum tubes.  The circuit is a three tube reflex, whereas the audio signal is fed back (reflexed) through the RF section for more audio amplification. So in theory, this one tube set performs like a radio with 4 tubes giving it enough audio amplification to drive a loud speaker. It's performance is typical of most two tube receivers with heads. Deference being, it does drive a load-speaker with ample volume.

 < Power supply for 1920's battery radios available
 < reproduction Rear Paper Label available.

Multivalve Tube Information.

the extra terminals

filaments all a-glow

The Multivalve is the equivalent of three 201A's in one envelope that's no bigger than the standard UX-201A tube (that was the industry standard of the mid 1920's) except for the base ring that had 4 additional terminals. The extra terminal were for the 2 additional grids and plates of the three section tube. The tube had three separate filaments (all in parallel) that was wired as a conventional 201A. Since filament type vacuum tubes had no cathode (the filament was coated with electron emitting material), one side of the filament served as the cathode.

C.E. Clutter


Member of:
Northwest Vintage Radio Society

Member of:
Antique Wireless Association