Sophia Electric™ Royal Princess™ 300B Tubes for 300B Amplifiers
Sophia Electric applied all expertise learned from the past to this new flagship Royal Princess 300B model. It has the best virtues of both Princess Mesh Plate and Princess Carbon Plate 300B tubes and sound light-years ahead of any 300B tubes made in the history including both Sophia Electric Princess Carbon Plate 300B and Princess Mesh plate 300B tubes that won worldwide praises.From the outside, the Royal Princess 300B tube looks similar to Carbon Plate Princess 300B (share the same glassware enclosure), however, the design philosophy is quite different and the internal design and material is different as well. You have to listen to it to hear the dramatic sonic upgrade. I am confident that you will report the positive outcome once you have tried the Royal Princess 300B tubes.
- Nominal operating conditions and parameters:
- Filament voltage
5,0 V *
- Nominal filament current
1,2 A
- Plate voltage
300 V
- Grid voltage (AC filament)
61 V **
- Grid voltage (DC filament)
58 V ***
- Plate current (AC filament)
60 mA
- Plate current (DC filament)
62,5 mA
- Grid to plate transconductance
5700 Ω
- Amplification factor
3.85
- Grid current
0.05 µA
- Plate resistance
700 Ω
- Limiting Operation conditions for safe operation-nor simultaneous ratings:
- Maximum plate voltage
450 V
- Maximum plate dissipation
40 W
- Maximum plate current of average tube for fixed grid bias
70 mA
- Maximum plate current for manually adjusted grid or self-biasing circuit
100 mA
** - AC filament supply is used. The grid and plate returns should be connected to a center tap on the secondary of the filament transformer.
*** - DC filament supply is used. The grid and platter returns are connected to the negative end of the filament.
PRICING
| Option 1: Premium matched pair with one year warranty. | €1600 |
Orders and warranty