Vacuum Tube 6550 Replaces KT88 KT66 KT77 KT120 KT150 KT100 EL34 HiFi Audio Tube Amplifier(1Pair Matched)

Power Amps
6550: Beam power quadrupole 6550 is similar to KT88 and can be used interchangeably.
Hot wire heating
Ultra high 6.3 volts
Ishi 1.6 A
Static parameters
Tetrode connection method
Voltage 250V
Voltage Ug2 250V
140 mA
Rated current 12mA
On resistance 11mA/V
12K
Replay......1.5K
Output power 12.5W
Total 7 %
Recommended working status (reference value)
Single tube A1 amplifier
UA(B)......400V
Ug2 225V
-Ug1......16.5V
I A (O) ...... 87 mA
Ia (maximum signal)......105 mA
Ig2 (0)......4 mA
Ig2 (maximum signal)......18mA
General Manager 9
Ri...... 27 k
20W
Total 13.5%
Push-pull Class A1 amplifier
Fixed bias voltage Self bias voltage
Voltage source (b) 400 600 400V
Ug2275 300 300V
-Ug23v31v RK=140 /
Rotary kiln No. 3.554.5
Ia(o)2×902×582×83 mA
Ia (maximum signal) 2×135 2×1362×95mA
Ig2(0) 2×4.52×22×3.6 mA
Ig2 (maximum signal) 2×222×20.52×19.5mA
Output power 55 100 41 watts
Total 32.5 4 %
Push AB1 class amplification, transistor connection
Self-bias voltage Fixed bias voltage
Ua.g2(b) 400 400 V
-Ug 40v RK=525 /
RL (amino acid) 4 4 K
~U(g1-g1.pk) 7878 V
Ia+g2(0)2×76 2×76 mA
Ig+Ig2 (max.sig) 2×80 2×80 mA
Pout 1717 W
Total net profit 1.5 1.5 %
Push-pull AB1 class amplifier (self-biased)
Voltage Ua(b)400V
Ug2 310V
INR 140
RL 5 thousand
~u(g1-g1.pk)43V
Ia(o)2X 85mA
Ia (maximum signal) 2X92.5 mA
Ig2(0) 2X5 mA
Ig2 (maximum signal) 2X12.5mA
Pout40 W
Total 0.7%
Push-pull AB1 class amplifier (fixed bias)
Voltage source (b) 400 450 600 V
Ug2270 310 300V
-Ug23 29.532.5V
Rotary kiln No. 3.53.55
~u(g1-g1.pk)46 58 65 V
Current value (a) 2×852×752×50mA
Ia (maximum signal) 2×137.5 2×1472×135mA
Ig2(0) 2×4.52×22×2.5 mA
Ig2 (maximum signal) 2×17.52×192×16.5mA
Pout6070 1001W
Total 0.61.53%
Push-over superlinear amplification
Class A1 Class AB1
Voltage source (b) 390 450V
Ug2 395 450V
-Ug RK=200 48v /
RL5.6 4K
~U(g1-g1.pk) 70 96 V
Current value (a) 2×85 2×75mA
Ia (maximum signal) 2×87 2×132.5mA
Ig2(0) 2×6.3 2×6mA
Ig2 (maximum signal) 2×11.52×19mA
Pout3470W
Total 1.52.4%
Buy 2 = one pair. Buy 4 = four pairs.