The beam power quadrupole 6550B has an anode limiting power of 35W (42W). In the audio amplifier, two tubes A1 and AB1 can be used to obtain 100W of power in the push-pull output. The 6550B can also be used in an electronic voltage regulator circuit. ; 6550B is similar to KT88 and can be used interchangeably.
Hot wire heating
UH----------6.3 V
IH-----------1.6 A
Limit rating
Anode voltage-----------------------600 V
Second gate voltage -----------------400 V
Anode Dissipated Power-----------------35 W
Second gate dissipation power -----------6 W
Cathode Current-----------------------175 mA
First gate voltage -----------------300 V
Hot wire cathode voltage -------------+200 V-300 V
First gate resistance
Self-bias: ------------0.25 MΩ
Fixed voltage: ------------0.05 MΩ
Interelectrode capacitance
Input Capacitor -------------------- -15 PF
Output Capacitor -------------------- PF
Cross-channel capacitance ---------------------0.85 PF
Static parameter
Ua----------------------------250 V
Ug2---------------------------250 V
-Ug1------------------------14 V
Ia-----------------------------140 mA
Ig2----------------------------12 mA
Gm---------------------------11 mA/V
Ri-----------------------------12 kΩ
Ia(max.sig)----------------150 mA
Ig2(max.sig)---------------28 mA
RL-----------------------------1.5 kΩ
Pout--------------------------12.5 w
Dtot----------------------------7 %
Recommended working status: (reference value)
Single tube A1 type amplification:
Ua(b)-------------------------400 V
Ug2----------------------------225 V
-Ug1------------------------16.5 V
Ia(0)--------------------------87 mA
Ia(max.sig)----------------105 mA
Ig2(0)-------------------------4 mA
Ig2(max.sig)---------------18 mA
Gm----------------------------9 mA/V
Ri-----------------------------27 kΩ
Pout--------------------------20 w
Dtot--------------------------13.5 %
Push-pull A1 class amplification
Fixed bias
Ua(b)---------400 600 400 V
Ug2------------275 300 300 V
-Ug1---------23 31 Rk=140Ω V
RL--------------3.5 5 4.5 kΩ
Ia(0)-----------2×90 2×58 2×83 mA
Ia(max.sig) 2×135 2×136 2×95 mA
Ig2(0)---------2×4.5 2×2 2×3.6 mA
Ig2(max.sig) 2×22 2×20.5 2×19.5 mA
Pout--------------55 100 41 w
Dtot---------------3 2.5 4 %
Push-pull AB1 class amplification Transistor connection
Self-biasing fixed bias
Ua. G2(b)---------400 400 V
-Ug1--------------40 Rk=525Ω V
RL---------------------4 4 kΩ
(g1—g1.pk)------78 78 V
Ia+g2(0)-------------2×76 2×76 mA
Ia+g2(max.sig)-- 2×80 2×80 mA
Pout-------------------17 17 w
Dtot-------------------1.5 1.5 %
Push-pull AB1 class amplification: (self-bias)
Ua(b)-------------------------400 V
Ug2----------------------------310 V
Rk-----------------------------140 Ω
RL-------------------------------5 kΩ
(g1—g1.pk)----------------43 V
Ia(0)--------------------------2×85 mA
Ia(max.sig)-----------------2×92.5 mA
Ig2(0)------------------- ------2×5 mA
Ig2(max.sig)--------------- 2×12.5 mA
Pout---------------------------40 w
Dtot---------------------------0.7 %
Push-pull AB1 type amplification (fixed bias)
Ua(b)---------400 650 400 V
Ug2-----------270 310 300 V
-Ug1--------23 29.5 32.5 V
RL----------------3.5 3.5 5 kΩ
(g1—g1.pk)---46 58 65 V
Ia(0)----------2×85 2×75 2×50 mA
Ia(max.sig) 2×137.5 2×147 2×135 mA
Ig2(0)---------2×4.5 2×4.5 2×2.5 mA
Ig2(max.sig) 2×17.5 2×19 2×16.5 mA
Pout--------------60 70 100 w
Dtot--------------0.6 1.5 3 %
Push-pull super linear connection
Class A1 Class A2
Ua(b)--------------390 450 V
Ug2-----------------395 450 V
-Ug1---------- Rk=200Ω 48 V
RL-------------------5.6 4 kΩ
(g1—g1.pk)-----70 96 V
Ia(0)---------------2×85 2×75 mA
Ia(max.sig) --2×87 2×132.5 mA
Ig2(0)-------------2×6.3 2×6 mA
Ig2(max.sig)---2×11.5 2×19 mA
Pout----------------34 70 w
Dtot----------------1.5 2.4 %
For delivery time:
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