File:Vintage Grebe MU-1 Synchrophase With Gold-Plated Escutcheons, Battery Operation, Circa 1925 (9120006960).jpg
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English: Vintage Grebe MU-1 "Synchrophase" vacuum tube radio receiver With Gold-Plated Escutcheons [ some clearly have Gold Paint, using actual Gold, which is removable with paint thinners ], Battery Operation, Circa 1925. This was a 5 tube tuned radio frequency (TRF) receiver with two stages of radio frequency amplification, a grid-leak detector stage, and two audio amplifier stages. The 3 tuning dials had to be tuned in unison, which, before the Synchrophase model, required three individual dial settings. The Synchrophase accomplished the tuning with a chain drive attaching the 3 dials together so all three thumb-wheels (dials) could be turned with one knob adjustment. So a third hand was not needed. Alternatively the chain drive could be linked or un-linked inside the cabinet as might be needed for very fine adjustments. |
| Date | |
| Source | Vintage Grebe MU-1 Synchrophase With Gold-Plated Escutcheons, Battery Operation, Circa 1925 |
| Author | Joe Haupt from USA |
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This image was originally posted to Flickr by France1978 at https://www.flickr.com/photos/51764518@N02/9120006960. It was reviewed on 6 September 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-sa-2.0. |
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| current | 21:21, 6 September 2014 | | 4,608 × 3,456 (4.09 MB) | Tm (talk | contribs) | Transferred from Flickr via Flickr2commons |
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