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UCH81 Pinout
basing pinout

 

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

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.

 

UCH81 Ratings

No information available

UCH81 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

 

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