Another angleQ: More details about the 4P55
A: 4P55 is a tetrode made in Japan.
It size is 16 cm high and 6 cm diameter.
Filament voltage is 6.3V and current is 2.6A.
Maximum DC plate voltage is 1500V for class AB1.
This tube was created by Toshiba corporation.
It was used by television stations and AM/FM broadcasters.
The structure of the screen grid (grid no. 2) is surprisingly detailed.
This difficult-to-build tube originally cost more than 600,000 yen. It was sold only to broadcasters.
Toshiba ceased production of the 4P55 long ago.
Sun Audio offers a stock of good used examples. They are priced according to each tube's run time- 30,000 yen to over 100,000 yen.
