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6550 Pinout
basing pinout

 

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

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.

 

6550 Ratings

No information available

6550 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

 

6550 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) 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)  KT90: KT90.pdf (67175 bytes)
Frank Philipse (Wildcat mirror - Jörg Jan Münter) 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)  KT90: KT90.pdf (67175 bytes)
Triode Electronics KT88: GEC1, GEC2, GEC3, Genelex1, Genelex2, Genelex3, Genelex4, Genelex5, Genelex6, Genelex7, Genelex8  KT90: gif1, gif2
TubeZone KT88: pdf
Virtual Valve Museum 6550: 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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