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CV1990 Pinout
basing pinout

 
CV1990 Substitutes
Close or identical 6SQ7, CV1991, VT103
Different filament voltage 12SQ7, 12SQ7GT, 6SQ7GT, CV546, CV547, VT104

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.

 
CV1990 Ratings
Vh
V		 Ih
A		 VaMax
V		 PaMax
W		 Cgk
pF		 Cak
pF		 Cga
pF
6.3 0.3 300 0.5 3.2 3.0 1.6

 
CV1990 Application Data
Class Va
V		 Vg1
V		 Ia
mA		 Ra
Ω		 S
mA/V
A 250 -2.0 1.1 85,000 1.175
A 100 -1.0 0.5 110,000 0.925

 
CV1990 Data sheet links
Peter Millett 6SQ7: Acrobat PDF 223K  12SQ7: Acrobat PDF 24K
The Valve Museum CV1991: html
oldradio.qrz.ru 6SQ7: Brans Vademecum, MK buizen handboek
Frank Philipse (Wildcat mirror - Jörg Jan Münter) 6SQ7: 6SA7.pdf (83250 bytes) (fr), 6SQ7.pdf (202861 bytes), 6SQ7.pdf (245274 bytes), 6SQ7.pdf (321892 bytes), 6SQ7.pdf (78329 bytes) (de), 6SQ7.pdf (96813 bytes)  12SQ7: 12A8G.pdf (82544 bytes) (fr), 12SA7.pdf (56736 bytes), 12SK7.pdf (57775 bytes), 12SQ7.pdf (231119 bytes)

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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