20-08-2020, 08:41 AM
(This post was last modified: 20-08-2020, 08:43 AM by Mike Watterson.)
AC/VP1 comes in 5 and 7 pin versions, RF/IF 1934 -1937. The 5 pin version seems rarely used. The AV/SGVM is probably older RF/IF 5 pin 4V
The D42 is another rarely used Mazda early 1930s detector (single diode)
SU25 is new to me, 25 kV 1mA rectifier with Octal base. It seems like the only really unusual one.
The 117Z6GT will be for US use without a dropper or transformer. Unlike some other dual rectifiers it can be used as a voltage doubler. Needed for direct mains radios in USA with higher than 120V HT.
U281 is half wave 200 mA series.
The N14 = 1C5G, a 1.4V battery audio out (originally Sylvania 1938)
Pen25 is 2V battery audio out.
18 is USA series heater audio out, early 1930s
25L6GT also US Audio out, it and 50V version popular in All American Five line up.
6L5G a popular 1930s triode. Maybe they are worth something.
6N6G is a preamp and power out pair of triodes for audio. Not push pull, but a complete audio amp for a radio. 1935 & 1936 are the peak years. USA.
So seems a mix of Mazda and USA 1930s. Though some are more European, like ECH3.
They seem like a random mix of valves for different things judging by variety of audio out types.
The D42 is another rarely used Mazda early 1930s detector (single diode)
SU25 is new to me, 25 kV 1mA rectifier with Octal base. It seems like the only really unusual one.
The 117Z6GT will be for US use without a dropper or transformer. Unlike some other dual rectifiers it can be used as a voltage doubler. Needed for direct mains radios in USA with higher than 120V HT.
U281 is half wave 200 mA series.
The N14 = 1C5G, a 1.4V battery audio out (originally Sylvania 1938)
Pen25 is 2V battery audio out.
18 is USA series heater audio out, early 1930s
25L6GT also US Audio out, it and 50V version popular in All American Five line up.
6L5G a popular 1930s triode. Maybe they are worth something.
6N6G is a preamp and power out pair of triodes for audio. Not push pull, but a complete audio amp for a radio. 1935 & 1936 are the peak years. USA.
So seems a mix of Mazda and USA 1930s. Though some are more European, like ECH3.
They seem like a random mix of valves for different things judging by variety of audio out types.
