TDSL Tube data [6550-A]

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6550-A Pinout

6550-A Substitutes

Close or identical	6550, 6550B, CK6550
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.

6550-A 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	660	200	42	6	190	14.0	12.0	0.85

6550-A Application Data

Class	Va V	Vg2 V	Vg1 V	Ia mA	Ig2 mA	Ra Ω	S mA/V	Rk Ω	Zout Ω	Pout W	THD %	Notes
A1	400	225	-16.5	87.0	4.0				3,000	20.0
A1	250	250	-14.0	140	12.0	15,000	11.0		1,500	12.5
AB1	400	310		170	10.0			140 common	5,000	40	0.7
AB1	400	270	-23.0	170	9.0				3,500	60	0.6
AB1	450	310	-29.5	150	9.0				3,500	77	1.5
AB1	600	300	-32.5	100	5.0				5,000	100	3.0
AB1	395			170	12.5			200 common	5,600	34	1.5	UL 40% taps
AB1	450		-48.0	150	12.0				4,000	70	2.4	UL 40% taps

6550-A Data sheet links

Dave Cigna''s Pages (DuncanAmps mirror)	6550: 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) 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) SV6550C: 6550C.pdf (51387 bytes)
TubeZone	KT90: 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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