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KT90[Under Construction]

 

 

 

 

 

 

 

KT90 is a beam-power pentode primarly designed for use in audio frequency power amplifier applications. Anode dissipation rate is 50W, which provides for push-pull amplifiers utilization up to 110W output per pair, with 550V on the anode. Up to 160W per pair may be achieved with anode voltage of 750V and screen grid voltage of 600V.

KT90 is recommended as a replacement for 6550, 6550A and KT88.

Key Benefits

  • power output
  • vastly increased anode and screen grid maximum voltages
  • low distorsion
  • extended tube life

General Characteristics

Heater voltage AC or DC 6,3 0,6 V

Heater Current 1,6 A
Direct interelectrode capacitances  
     G1 to  A 1,8 pF
     G1 to (H+C+G2+BF+A) 29,0 pF
     A to (H+C+G2+BF+G1) 10,0 pF
Mounting position any
Envelope glass
Base universal
octal 8-pin

 

PIN No.

Connection

1 -
2 Heater
3 Anode
4 Grid No. 2 (screen)
5 Grid No. 1
6 -
7 Heater
8 Cathode & Beam Former

 

Maximum ratings (absolute)

Pentode Connection

Triode Connection

UA 750 V 600 V
UG2 650 V -
UA-UG2 650 V 600 V
-UG1 200 V 200 V
PA (dissipation) 50 W 50 W
PG2 8 W -
PA+G2 54 W -
IC 230 mA 230 mA
Uc-f (total DC) 300 V 300 V

Characteristics using 250V "B+" as a guide

Average characteristics, pentode connection

UA 250 V 400 V
UG2 250 V 300 V
-UG1 14 V 27 V
IA 145 mA 90 mA
IG2 8 mA 4,7 mA
-UG1 (IA=1 mA approx.) 36 V 42 V
gm 14 mA/V 8,8 mA/V
Ri (approx.) 11 kOhm 25 kOhm

Average characteristics, triode connection

UA,UG2 250 V
-UG1 14 V
IA+G2 153 mA
IG2 8 mA
gm 15 mA/V
Ri (approx.) 650 Ohm
Amplification factor 9

See some graphs ...


 

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Copyright 2002 Ei Elektronske Cevi DOO
Last modified: 01.12.2002