{"id":297,"date":"2012-06-17T17:01:13","date_gmt":"2012-06-17T17:01:13","guid":{"rendered":"http:\/\/www.bartola.co.uk\/valves\/?p=297"},"modified":"2012-06-17T17:03:51","modified_gmt":"2012-06-17T17:03:51","slug":"6cb5a-output-valve-in-triode-mode","status":"publish","type":"post","link":"https:\/\/www.bartola.co.uk\/valves\/2012\/06\/17\/6cb5a-output-valve-in-triode-mode\/","title":{"rendered":"6CB5a output valve in triode mode"},"content":{"rendered":"
\"\"<\/a>
6CB5a RCA NOS under test<\/figcaption><\/figure>\n

6CB5a, as many TV power pentodes, is a great valve for a single ended amplifier. Specially now that popular valves of similar anode dissipation are getting really expensive.<\/p>\n

Thomas Mayer came up with a great design for this superb TV pentode that wired in triode mode is very linear and can sustain at least 25W of anode dissipation. If you want to check Thomas’ design, have a look at his website<\/a> which is very interesting.<\/p>\n

If you want to look at the specifications, you can download the datasheet here<\/a>.<\/p>\n

When testing this valve on the curve tracer it was evident the fantastic features and linearity at every point.<\/p>\n

As a power valve, testing a 6CB5a for harmonic distortion showed THD=0.07% @ Vo=+22.22dBu (10Vrms) at the following operating point:<\/p>\n