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KT90 Pinout
basing pinout

 

KT90 Substitutes
Different rating or performance 6550, CK6550, CV5220, KT88, KT88S, KT88SC

Warning: Substitutes are given as a guide only - please refer to original manufacturers data sheets to ensure that a substitute is safe and appropriate for your application.

 

KT90 Ratings

No information available

KT90 Application Data
Class Va Vg2 Vg1 Ia Ig2 Ra S Rk Zout Pout THD Notes
A 400 225 -16.5 87.0 4.0 3,000 20.0
A 250 250 -14.0 140 12.0 15,000 11.0 1,500 12.5
AB1 U/L 40% 553 -75.0 2x50 4500 100 2.0
AB1 U/L 40% 453 -59.0 2x50 4000 70 2.0
AB1 U/L 40% 436 2x87 2x600 6000 50 1.5 B+ = 500V
AB1 U/L 40% 328 2x87 2x400 5000 30 1.0 B+ = 375V
AB1 triode 349 2x79 2x525 4000 17 1.5 B+ = 400V
AB1 triode 422 2x94 2x525 4000 31 1.5 B+ = 485V

 

KT90 Data sheet links
Dave Cigna''s Pages (DuncanAmps mirror) 6550: html
Peter Millett 6550: Acrobat PDF 100K
National Valve Museum KT88: html
Penta Laboratories KT88S: Acrobat PDF
Frank Philipse KT88: 084/k/KT88.pdf, 086/k/KT88.pdf
Frank Philipse (Pocnet mirror - Patrik Schindler) KT90: KT90.pdf (67175 bytes)  6550: 6201.pdf (902849 bytes), 6550.pdf (135652 bytes), 6550.pdf (421187 bytes)  KT88: KT88.pdf (236209 bytes), KT88.pdf (434345 bytes), KT88.pdf (633155 bytes), KT88spec.pdf (70096 bytes), KT88_GEC.pdf (9774126 bytes)
Frank Philipse (Wildcat mirror - Jörg Jan Münter) KT90: KT90.pdf (67175 bytes)  6550: 6201.pdf (902849 bytes), 6550.pdf (135652 bytes), 6550.pdf (421187 bytes)  KT88: KT88.pdf (236209 bytes), KT88.pdf (434345 bytes), KT88.pdf (633155 bytes), KT88spec.pdf (70096 bytes), KT88_GEC.pdf (9774126 bytes)
Triode Electronics KT90: gif1, gif2  KT88: GEC1, GEC2, GEC3, Genelex1, Genelex2, Genelex3, Genelex4, Genelex5, Genelex6, Genelex7, Genelex8
TubeZone KT90: pdf
Virtual Valve Museum KT88: HTML page

Bold designators are close or identical, Italic designators are different ratings, different pinouts or different filament voltages. Please see the substitutes at the top of the page for more details

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