Psvane 274B T-II Ensretter rør

Glass shell eight feet directly heated full-wave rectifier，274B is very similar with 5U4G and 5Z3P, which can be replaced by each other.

274B is very close in all spec details to 5U4G, 5Z3P and even 5AR4/GZ34. The 274B requires a filament current of 2A  which is lower than the 5U4G/GB or 5Z4P which would need 3A.
A 5AR4/GZ34 requires 1.9A only. Since that difference is very small most good designed amplifier power supplies should easily accept this. To replace a 5AR4 or GZ34 please refer to your amps manual to make sure this minior increase in current can be tolerated by the amps power supply before (!) you use a 274B instead.

Suggested burn-in time is 30-40 hours

absolute Maximum Ratings
Ua max................ 1550V
Ia max. ................ 750mA  
Ua ........................500V

C max. ................ 4μF
Ia (dc)..................≧ 220mA

Tube Type:
5U4/5C3S/5Z3P/274B
Socket:
Octal(8Pin)

Heater

Uf………………5V
If…………… 2.5A

Maximum Rating

anode inverse peak voltage……………1550V
anode peak current        ………750mA

Recommend working condition

Anode supply voltage             2×500V

Each arm impedance               75Ω

load impedance                   2000Ω

Filter capacitor                 4μF

Rectifier current                ≧220mA