Preamps
Item No.: Hifi 805A
805 is a directly heated thoriated tungsten cathode triode, which can be used for Class B, AF, power amplification, Class C power amplification and high frequency oscillation.
Heater
Uf----------------------------------------10V

If-------------------------3.25 A

Direct interelectrode capacitance

Input----------------------------------8.5 PF

Output----------------------------------10.5 PF

Grid to Plate---------------------------------6.5 PF

Maximum Ratings

Ua--------------------------------1500V

Pa-----------------------------125 W
Recommended operating conditions (reference values)

Class B (AF) double barrel

Typical operating limit parameters

Ua------------------ 1250 1500 1250 V

Ia (mAx.sig per tube) -------------------- 210 mA

Pa (in) (mAx.sig per tube)--------------- 315 W

Pa (per ton---------------------------- 125 W

Uh----------------------------------16V

Ug(pk)----------------235 280 V

Ia (0)----------------148 84 mA

Ia(mAx.sig)----------500 600 mA

Pd(mAx.sig)------------6 7 W

RL(aa)--------------6.7 8.2 K

Output power (mAx.sig) --------------300 370 W

Class B ():
The maximum modulation factor under current carrying condition is 1 per tube

Typical operating limit parameters

Ua------------------ 1250 1500 1500 V

UG----------------------------------10V

Ia -------------------135 115 150 mA

Pascal (inch) ---------------------------- 185 Watts

Pa---------------------------------125 W

Ug (peak)----------------70 70 V

Immunoglobulin ------------------- 15 15 mA

Pd-------------------11 7.5W

Pout------------------55 57.5 W

Buy 2, 4 or 8 pieces, the factory will accurately match them and the parameters are 100% consistent.