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KT66 Pinout
basing pinout

 
KT66 Substitutes
Close or identical CV1075, CV321, VT75(RAF)

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.

 
KT66 Ratings
Vh Ih VaMax Vg2Max PaMax Pg2Max Cgk Cak Cga Notes
6.3 1.27 500 400 25 3.5 16.0 11.5 1.1 Tetrode connected
6.3 1.27 400 25 8.7 15.8 7.2 Triode connected

 
KT66 Application Data
Class Va Vg2 Vg1 Ia Ig2 Ra S Rk Zout Pout THD Notes
Static 250 250 -15.0 22,500 6.3
A S/E 250 250 85 6.3 160 2,200 7.25 9.0
A P/P 390 275 104 5.0 500 each 8,000 30.0 6.0
A P/P 250 250 162 12.0 200 each 4,000 17.0 4.0
AB1 P/P 510 395 -40 80 3 5,000 At idle
AB1 P/P 475 360 -40 175 19 5,000 50.0 5.0 Full output
Static (triode) 400 -38.0 1,450 5.5
A S/E (triode) 400 63 600 4,500 5.8 7.0
A S/E (triode) 250 60 315 2,750 2.2 6.0
A P/P (triode) 400 125 600 each 4,000 14.5 3.5
A P/P (triode) 250 110 360 each 2,500 4.5 2.0

 
KT66 Data sheet links
Dave Cigna''s Pages (DuncanAmps mirror) KT66: html
Duncan''s Amp Pages KT66: Acrobat PDF (4 pages)
National Valve Museum KT66: html
oldradio.qrz.ru KT66: MK buizen handboek
Frank Philipse (Wildcat mirror - Jörg Jan Münter) KT66: KT66.pdf (145018 bytes), KT66.pdf (418930 bytes), KT66.pdf (582695 bytes), KT66_GEC.pdf (6406803 bytes)
TubeZone KT66: pdf

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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