PSVANE 6CA7-TII Hi-end Vacuum Tube Classic Grade Best Matched pair 6CA7-T MK II

All items guaranteed 100% BRAND NEW in the original edition Box.
ONE-YEAR WARRANTY !!!

6CA7-TII
The high-performance audio output pentode has an anode limiting power of 25W. In an audio amplifier, the output power is greater than 10W for single-tube A1 amplification, and the output power is greater than 35W for double-tube amplification for AB1.
6CA7-TII is similar to EL34 and can be used interchangeably.

Filament heating
UH……………………………6.3 V
IH……………………………1.5 A

Static parameter
Ua…………………………… 250 V
Ug2……………………………250 V
Ug3…………………………… 0 V
-Ug1…………………………12.2 V
Ia…………………………… 100 mA
Gm…………………………… 11 mA/V
ri…………………………… 15 kΩ
μg1-g2………………………11

Limit rating
Anode voltage........................... 800 V
Second gate voltage..................... 500 V
First gate voltage..................... -100 V
Anode dissipated power..................... 25 W
Second gate dissipation power............... 8 W
Cathode current...........................150 mA

The first gate resistance
Self-bias ........................... 0.7 MΩ
Fixed bias ........................ 0.5 MΩ
Hot wire cathode voltage .................. ± 100 V
Bulb Temperature ........................... 250 ° C.

Electrode capacitance
Input capacitance ........................ 15.2 PF
Output capacitance ........................ 8.4 PF
The cross road capacitance ........................ 1.1 PF
First gate hot wire capacitance ......... 1.0 PF
Hot wire cathode capacitance ............... 10 PF

Recommended work status (reference value)
Class A1 amplifier (single tube fixed bias)
Ua (b) ........................ 265 265 V
Ua ................................. 250 250 V
Ug2 ........................... Rg2 = 2k Rg2 = 0
Ug3 ................................. 0 0 V
-Ug1 ........................... 14.5 13.5 V
Ia (0) ........................... 70 100 mA
Ig2 (0) ........................ 10 14.9 mA
Gm ................................. 9 11 mA / V
ri ................................. 18 15 kΩ
RL ................................. 3 2 kΩ
Pout .............................. 8 11 W
Dtot .............................. 10 10%

The push-pull Class B1 zoom (fixed bias)
Ua ................................. 375 400 V
▲ Rg2 .............................. 600 800 Ω
Ug3 .............................. 0 0 V
-Ug1 .............................. 33 36 V
Ia (0) ..................... 2 × 30 2 × 30 mA
Ia (maxsig) ......... 2 × 107.5 2 × 110.5 mA
Ig2 (0) .................. 2 × 4.7 2 × 4.5 mA
Ig2 (maxsig) ......... 2 × 23.5 2 × 23 mA
Rl (a-a) .................. 3.5 3.5 kΩ
ü (g1-g1) (r.M.S) ......... 46.7 50 V
Pout ........................ 48 54 W
Dtot ........................ 2.8 1.6%
▲ Rg2 shared two tubes.

The push-pull Class B1 zoom ultra-linear connection (self-bias)
(43% tapping points)
Ua .................................... 430 V
Rg2 ................................. 2 × 1 kΩ
Ia (0) ........................... 2 × 62.5 mA
Ia (max.sig) .................. 2 × 65 mA
Ig2 (0) ........................... 2 × 10 mA
Ig2 (max.sig) ............... 2 × 10.2 mA
Rk ................................. 2 × 470 Ω
Ug1-g1)(r.M.S) ……………35 V
RL (a-a) ........................... 6 kΩ
Pout ................................. 20 W
Dtot .............................. 0.35%