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CK6550 Pinout
basing pinout

 
CK6550 Substitutes
Close or identical 6550, 6550A, 6550B
Different rating or performance 6550C, CV5220, KT88, KT88S, KT88SC, KT90, SV6550C

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.

 
CK6550 Ratings
Vh
V		 Ih
A		 VaMax
V		 VhkMax
V		 PaMax
W		 Pg2Max
W		 IkMax
mA		 Cgk
pF		 Cak
pF		 Cga
pF
6.3 1.6 600 200 35 6 175 14.0 12.0 0.85

 
CK6550 Application Data
Class Va
V		 Vg2
V		 Vg1
V		 Ia
mA		 Ig2
mA		 Ra
Ω		 S
mA/V		 Zout
Ω		 Pout
W
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

 
CK6550 Data sheet links
Dave Cigna''s Pages (DuncanAmps mirror) KT88: html
Peter Millett 6550: Acrobat PDF 100K
The Valve Museum KT88: html
Frank Philipse (Wildcat mirror - Jörg Jan Münter) 6550: 6201.pdf (902849 bytes), 6550.pdf (135652 bytes), 6550.pdf (421187 bytes)  6550A: 6550A.pdf (606171 bytes)  SV6550C: 6550C.pdf (51387 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)
TubeZone KT88: pdf
Wikipedia 6550: Wikipedia 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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