6922 , E88CC > datasheet

- 6922 = Premium 6DJ8 with heater current reduced from 365ma to 300ma
- 6922 will have a slightly longer lifespan than 6DJ8; in some cases 6922 will last 5-10,000 hours vs 3-4,000 hrs for a 6DJ8
7308 , E188CC > datasheet

- 7308 = 10,000 hour premium 6922 with low microphonics
- Low Noise Reference Quality 7308; recommended especially for phono-stages and high-gain preamps that are sensitive to noise and microphonics
HISTORY :
Life Test = 10,000 hours (Vplate=100V, Iplate=15ma)
Mechanical Quality = Shock and Vibration resistant (uprated over 6922 or CCa)
7308 will probably not last 10,000 hours if Vplate=200-220V
ELECTRICAL DATA:
MAX RATINGS:
Heater voltage 6.3V
Heater current 335mA
Max plate voltage (Plate current = 0ma) 400V
Max operating plate voltage 220V
Max plate dissipation 1.5W
Max plate current 20mA
Max grid voltage -100V
TYPICAL OPERATION: (for 10,000 hour life)
Heater = 6.3
Heater Current = 335ma (range is 318ma - 352ma)
Vplate = 100V
Vgrid = -1.2V
Iplate = 15ma
Rplate = 2650 ohms
Gm = 12500 (Gm under 9000 would be towards end of life)
Mu = 33
Pa Max = 1.5 watts
-----------------------------------------------------
6922 , E88CC inside

6922 Frame Grid (Spanngitter)

6022 Frame Grid (Spanngitter)

Mullard EL34 inside

Visseaux 6V6GT inside

- 6922 = Premium 6DJ8 with heater current reduced from 365ma to 300ma
- 6922 will have a slightly longer lifespan than 6DJ8; in some cases 6922 will last 5-10,000 hours vs 3-4,000 hrs for a 6DJ8
7308 , E188CC > datasheet

- 7308 = 10,000 hour premium 6922 with low microphonics
- Low Noise Reference Quality 7308; recommended especially for phono-stages and high-gain preamps that are sensitive to noise and microphonics
HISTORY :
Life Test = 10,000 hours (Vplate=100V, Iplate=15ma)
Mechanical Quality = Shock and Vibration resistant (uprated over 6922 or CCa)
7308 will probably not last 10,000 hours if Vplate=200-220V
ELECTRICAL DATA:
MAX RATINGS:
Heater voltage 6.3V
Heater current 335mA
Max plate voltage (Plate current = 0ma) 400V
Max operating plate voltage 220V
Max plate dissipation 1.5W
Max plate current 20mA
Max grid voltage -100V
TYPICAL OPERATION: (for 10,000 hour life)
Heater = 6.3
Heater Current = 335ma (range is 318ma - 352ma)
Vplate = 100V
Vgrid = -1.2V
Iplate = 15ma
Rplate = 2650 ohms
Gm = 12500 (Gm under 9000 would be towards end of life)
Mu = 33
Pa Max = 1.5 watts
-----------------------------------------------------
6922 , E88CC inside
6922 Frame Grid (Spanngitter)

6022 Frame Grid (Spanngitter)
Mullard EL34 inside



Visseaux 6V6GT inside


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