04-10-2021, 11:43 AM
It's not listed in the copy of Berg I have.
1) To find g1
Put 1.2V on filament and then have +9V via 10K Ohms with -ve to either filament pin. Which ever pin has the most current is g1.
2) To find g2
Put 1.2V on filament and then have -3V via 1M Ohms with +ve to either filament pin on the pin identified in 1. Have +30V via 100 K to each unknown pin with -Ve to either filament pin. Highest current is probably g2.
3) Strap unknown two pins (one is anode and one is g2). Verify with 33K load and +30V that the current is more than g2 and varies with g2 and/or g1. If this is true, then g2 is correctly found.
4) Anode may be identifiable by inspection, otherwise connect the g1 found to -1V to -5V (adjustable). g2 to +30V via 33K and try one unknown to 0V and the other to +30V via 22K. See which way round works best like a pentode.
1) To find g1
Put 1.2V on filament and then have +9V via 10K Ohms with -ve to either filament pin. Which ever pin has the most current is g1.
2) To find g2
Put 1.2V on filament and then have -3V via 1M Ohms with +ve to either filament pin on the pin identified in 1. Have +30V via 100 K to each unknown pin with -Ve to either filament pin. Highest current is probably g2.
3) Strap unknown two pins (one is anode and one is g2). Verify with 33K load and +30V that the current is more than g2 and varies with g2 and/or g1. If this is true, then g2 is correctly found.
4) Anode may be identifiable by inspection, otherwise connect the g1 found to -1V to -5V (adjustable). g2 to +30V via 33K and try one unknown to 0V and the other to +30V via 22K. See which way round works best like a pentode.
