The callsigns of AFRS were indicated on dial (left). Name Plate (right)
Radio set Passed Examination by The Ministry of Posts and Telecommunications
No.31 National Model 5S-12 "Kokumin-gata Super" 5 tubes Super Heterodyne,
mfr: Matsushita Electric Ind. Co.,Ltd. Wireless MFG. Dept., Passed at 12/06/1948, Original Price: JPY 6,350
The callsigns of AFRS were indicated on dial (left). Name Plate (right)
Bottom View of Chassis (left), View of IFT. (center and right)
TUBES: 6A7-6D6-75-6ZP1-12F (Prototype), 6WC5-6D6-6ZDH3A-6ZP1-12F (Production
Model)
Permanent Dynamic Speaker (National Model NPD65, 6.5")
Matsushita created this low cost super heterodyne as a new generation’s standard set.
Small cabinet was simplified and dial mechanism was diverted from their TRF set.
Prototype appeared on magazine used old tubes 6A7 and 75.
Mass production model used new tubes 6WC5 (converter) and 6ZDH3A (detector and triode).
To reduce cost, The shield case of IFT was omitted, and 2 nd IFT was single
tuning.
Auto-transformer was used for power transformer.
The price was reduced 30% from old super heterodyne set.
The circuit design of this model was unreasonable to keep quality.
The price of this set was higher than small manufacturer’s super heterodyne set.
And the price was twice of typical TRF set. It was expensive to ordinary people.
Simplified design was not enough to realize a status for the price.
This model was not succeeded.
After half a year, at the end of 1948, this model was changed into Model 5S-15.
Model 5S-15 used ordinary circuit design.
Tubes were missing, We put the tubes from our stock.
Appeared on The Denpa Nippon Vol.45 No.3 published by Nippon Denpa Kyokai
Appeared on The Denpa Kagaku (Radio Technic & Science) 07/1948 published by Nippon Housou Shuppan Kyokai
(Collection No.11680)