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CV2128 Pinout
basing pinout

 

CV2128 Substitutes
Close or identical 6AJ8, 6C12, ECH81, X719
Different filament voltage UCH81

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.

 

CV2128 Ratings
Vh Ih VaMax Vg2Max VhkMax PaMax Pg2Max IkMax Cgk Cak Cga Notes
6.3 0.3 300 125 100 1.7 1.0 12.5 avg 4.8 7.9 0.006 Heptode section
6.3 0.3 250 0.8 6.5 avg 2.6 2.1 1.0 Triode section

 

CV2128 Application Data
Class Va Vg2 Vg1 Ia Ig2 Ra S Notes
Static 100 -1.0 10.0 3.2 Triode section
Frequency changer 100 4.5 Triode section
Static 250 100 -2.0 6.5 2.4 Heptode section
A 250 100 -2.0 6.5 3.8 700,000 2.4 Heptode section
Frequency changer 250 103 -2.0 3.25 6.7 1,000,000 Heptode section

 

CV2128 Data sheet links
Duncan''s Amp Pages 6C12/ECH81: Acrobat PDF (10 pages)
National Valve Museum CV2128: html  UCH81: html2
oldradio.qrz.ru 6C12: MAZDA Valves & Picture Tubes Data  ECH81: MK buizen handboek
Frank Philipse (Pocnet mirror - Patrik Schindler) 6AJ8: 6AJ8.pdf (762509 bytes), 6AJ8.pdf (85372 bytes)  ECH81: ECH81.pdf (108296 bytes) (fr), ECH81.pdf (188664 bytes) (de), ECH81.pdf (508079 bytes), ECH81.pdf (522127 bytes) (fr), ECH81.pdf (9041652 bytes) (cs), ECH81.pdf (99461 bytes)  X719: X719.pdf (311300 bytes)  UCH81: UCH81.pdf (101857 bytes), UCH81.pdf (133898 bytes) (fr), UCH81.pdf (1397950 bytes) (cs), UCH81.pdf (2103261 bytes), UCH81.pdf (425404 bytes) (fr)
Frank Philipse (Wildcat mirror - Jörg Jan Münter) 6AJ8: 6AJ8.pdf (762509 bytes), 6AJ8.pdf (85372 bytes)  ECH81: ECH81.pdf (108296 bytes) (fr), ECH81.pdf (188664 bytes) (de), ECH81.pdf (508079 bytes), ECH81.pdf (522127 bytes) (fr), ECH81.pdf (9041652 bytes) (cs), ECH81.pdf (99461 bytes)  X719: X719.pdf (311300 bytes)  UCH81: UCH81.pdf (101857 bytes), UCH81.pdf (133898 bytes) (fr), UCH81.pdf (1397950 bytes) (cs), UCH81.pdf (2103261 bytes), UCH81.pdf (425404 bytes) (fr)

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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