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Grebe Synchrophase Models MU-1 and MU-2 were made from mid August 1924 to September 1927 and Model 55 during a short period in 1928.
Made by A.H. Grebe & Company, Inc. of Richmond Hill, N.Y. USA
These radios were arguably the best TRF Battery Radios of the 1920s Jazz Age.
If you own one of these wonderful Grebe Radios, or even if you are just interested, please email for information or if you have any questions.
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Pictures and technical details can be supplied if requested.
Do you need the original component values?
Do you need to balance the neutralising Cs in your set?
The following documents have been scanned, and are currently available...
Original Grebe circuit diagrams for most MU versions (schematics)
Grebe Synchrophase Service Bulletins
January 20th 1927 Vol IV No1 Radio Dealer Obligations Etc
February 20th 1927 Vol IV No2 Synchrophase Greater Selectivity
March 30th 1927 Vol IV No3 Choice of special tubes in the Synchrophase
Contemporary Reviews and Write-ups
QST October 1924 w/up (early references)
QST April 1925 w/up plus circuit (article by R.R. Batcher)
Radio News April 1925 binocular coil w/up plus part circuit
Popular Science April 1925 binocular coil article
Popular Radio August 1925 w/up plus circuit (excellent details)
Radio News April 1926 w/up plus new circuit
Popular Radio October 1926 review of New Model Console
A detailed development study is in progress, and will appear here when complete.
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Synchrophase 7 News
If you are lucky enough to own an early Synchrophase 7 that did not use 'potmetal' parts, or own a good later model, the official Grebe Service Bulletin with the 'Alignment and Compensation of Radio Frequency Tuning Stages in the Synchrophase 7' is now available. This is vital if your set has been mis-adjusted.
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Shown is an early ad showing MU-1 and MU-2
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