What was the first transistor radio made in Japan?
Although Japanese manufacturers were a bit behind the American companies in producing transistor radios they quickly caught up and exceeded expectations. The first Japanese transistor ever released was Sony’s TR-55. At the time Sony was a brand name, the company itself was called Tokyo Tsushin Kogyo. The TR-55 is incredibly rare today.
What is the best portable transistor radio to buy?
The first Royal 500 was hand wired and had a metal chassis! The fifth generation Zenith 500 was the 500H. It has a large oval speaker and is considered to be the best sounding/performing portable transistor radio ever. If you’re into high performance you may want to consider this one.
What color of transistor radio is the most expensive?
With any transistor radio from the 1950’s or early 60’s it seems that the brighter the color the higher the price. Cool 50’s shades like robin’s egg/powder blue, seafoam green and bright red or yellow command higher prices.
What is reverse painting of transistor radios?
Reverse (back) painting was a very popular method of ornamenting transistor radios between 1958 and 1962. By painting all artwork on the inside of the clear plastic dial cover, there would be no wear or damage to the most attractive features of the radio. A smooth protective surface remained on the outer dial.
What is the function of Transistor Q3 and D1 in MOSFET?
The transistor Q3 and D1 act as the active collector load, to get the output signal in a push-pull model. To drive the gate of the transistor output Q8 (2SK143) and Q9 (2SJ49). And at the gate of both power MOSFETs, it has diodes D2-D5 attach to protects the overdrive.
Is 2sk134 + 2sj49 a good MOSFET?
Because buying power MOSFET 2SK134 +2SJ49 is very difficult. Or use others instead of 2SK135+2SJ50 is cheaper than the same shape. Or use this number instead of IRFP240 + IRFP9240 different shapes (Plastic body). I do not know the quality of the sound. But friends said the sound is good and cheap as well.
