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1939 Masterpiece VI (6)

1939 Masterpiece VI ; McMurdo Silver, Inc. (ID = 1830749) Radio 1939 Masterpiece VI ; McMurdo Silver, Inc. (ID = 1830747) Radio
1939 Masterpiece VI ; McMurdo Silver, Inc. (ID = 1830748) Radio 1939 Masterpiece VI ; McMurdo Silver, Inc. (ID = 1830750) Radio
1939 Masterpiece VI ; McMurdo Silver, Inc. (ID = 1830751) Radio 1939 Masterpiece VI ; McMurdo Silver, Inc. (ID = 1830752) Radio
1939 Masterpiece VI ; McMurdo Silver, Inc. (ID = 1830753) Radio 1939 Masterpiece VI ; McMurdo Silver, Inc. (ID = 1832284) Radio
1939 Masterpiece VI ; McMurdo Silver, Inc. (ID = 1833432) Radio
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1939 Masterpiece VI ; McMurdo Silver, Inc. (ID = 1830749) Radio
McMurdo Silver, Inc.: 1939 Masterpiece VI [Radio] ID = 1830749 1392x753
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For model 1939 Masterpiece VI (6), McMurdo Silver, Inc.(pre WW2); Chicago:
The cover sits on top of the chassis.
Country:  United States of America (USA)
Manufacturer / Brand:  McMurdo Silver, Inc.(pre WW2); Chicago
Year: 1938/1939 Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 20: 6K7G 6K7G 6L7G 6J7G 6G5 6K7G 6K7G 6F8G 6K7G 6H6G 6K7G 6H6G 6J7G 6L7G 6F8G 6J5G 6L6G 6L6G 5Z3 5Z3
Main principle Superhet with RF-stage
Wave bands Broadcast, Long Wave and more than two Short Wave bands.
Power type and voltage Alternating Current supply (AC) / 115V Volt
Loudspeaker Electro Magnetic Dynamic LS (moving-coil with field excitation coil) / Ø 18 inch = 45.7 cm
Power out
from Model: 1939 Masterpiece VI - McMurdo Silver, Inc.pre WW2;
Material Metal case
Shape Chassis only or for «building in»
Dimensions (WHD) 21.25 x 10 x 13 inch / 540 x 254 x 330 mm
The 1939 Masterpiece VI (39MPVI) does not include a specific cabinet. It is only the receiver chassis, amp chassis, and 18-inch McMurdo Silver Super Giant speaker.
During 1938, a newly-revised Masterpiece was designed by McMurdo Silver - truly the last of this line. They were manufactured by Hallicrafters. As of late-2016, only 4 of these radios have come to light. Based on the Hallicrafters serial numbers of these 4 receivers, two were manufactured in the August 1938 timeframe, just before the production run of the Hallicrafters DD-1, and two were manufactured in the early-October 1938 timeframe, exactly at the same time McMurdo Silver closed its doors forever. It is estimated from the known serial numbers that just 50-60 of the 39MPVIs were produced, total. The only advertisement found for this radio ran in the Nov. & Dec., 1938 editions of Radio News, after McMurdo Silver had already ceased operation. The earliest description of this radio found was in 2010 on, however it was not recognized as a distinct model until 2014.
Outwardly the 39MPVI looks very similar to the 1938 Masterpiece VI (MPVI), but there are several physical differences and numerous design changes. Physically, the chassis cover of the 39MPVI has rounded corners and sits on top of the chassis, compared to the covers of the Masterpiece V (MPV) and MPVI, which were square-cornered and slid down over the edges of chassis. Once the cover is removed, the chassis reveals a different tube layout with one tube missing, immediately to the left (from the front) of the tuning capacitor and just behind the dial. The 3 Intermediate Frequency (IF) transformers (not 4 as in the MPVI) have trimmers on top like the 15-17, and the other 3 transformers on the IF/Audio side of the chassis have holes with rubber grommets but no trimmers.
The tube lineup employs all-glass G-style tubes, but has significant modifications from the MPVI. It turns out to be an interesting combination of the now-familiar RF section from the MPV and MPVI, mated to an upgraded version of the IF section of the 15-17 and a rearranged Audio (AF) section unique to itself. The Fidelity control is greatly simplified from the MPVI, using the design of the 15-17, but enhanced to provide the 4 bandwidth options of the MPVI, instead of 3 on the 15-17. Gone are the 6B8s used as the MPVI's RF- and IF-AVC tubes, replaced by individual 6K7/6H6 combinations like the MPV's AVC circuit, except separated for RF and IF as in the MPVI. The double tubes used are dual-triode 6F8s in the AF section. One 6F8 implements the Detector & BFO, and the other implements the Expander circuit. The reduced tube count from 21 to 20 comes from having only 2 IF amps instead of 3 in the MPVI.
The 1939 Masterpiece VI amplifier chassis has a power supply with 2 x 5Z3 tubes and power amplifier with 2 x 6L6 tubes. Like the late MPVIs, power supply choke L1 is mounted outboard on the speaker pedestal, and a 7-wire harness runs between the amp and the speaker.
Like the MPVI, the 39MPVI has five bands, double-preselection, volume expander, 4-bandwidth Fidelity control, separate bass and treble controls, two-speed tuning knob, cathode-ray tuning indicator and great art deco styling. The "1939 Masterpiece VI" name comes from the ad in Radio News. All four radios found have "Masterpiece VI" embossed in the escutcheon like the 1937/38 MPVI. The 5 bands cover the same frequency ranges as the Masterpiece VI.
Collectors' prices  
Mentioned in Radio News (Advertisement, Radio News, Nov. 1938, pg. 48)

Model page created by Rodney Boleyn. See "Data change" for further contributors.

All listed radios etc. from McMurdo Silver, Inc.(pre WW2); Chicago
Here you find 39 models, 36 with images and 8 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.