Re: Centre tap or not to Centre tap on 2A3 filament tranies ?

SET Asylum

Single Ended Triodes (SETs), the ultimate tube lovers dream.

In Reply to: Centre tap or not to Centre tap on 2A3 filament tranies ? posted by lovetube on March 4, 2007 at 23:00:16:

In my experience, few 2A3s (or 300Bs for that matter) are so well balanced that a center tap will keep the hum acceptably low with AC on the filament. A hum pot that can be adjusted for each tube will usually give you 6dB or more reduction in hum - in which case there's no connection to the center tap, and it is of no use.
Incidentally, on a normal power transformer, the 2.5v winding will have only a few turns, maybe 10 or so. Getting a center tap that is really accurate is not that easy...

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Follow Ups Full Thread

Topic - Centre tap or not to Centre tap on 2A3 filament tranies ? - lovetube 23:00:16 03/04/07 (3)

Re: Centre tap or not to Centre tap on 2A3 filament tranies ? - Paul Joppa 12:19:40 03/05/07 (1)

thanks both of you . I will give it a thought - lovetube 05:26:40 03/06/07 (0)

depends on how you execute your 2A3 and whether or not you are doing AC heating - Quest 07:47:44 03/05/07 (0)

Follow Ups

Re: Centre tap or not to Centre tap on 2A3 filament tranies ? - Paul Joppa 12:19:40 03/05/07 (1)

thanks both of you . I will give it a thought - lovetube 05:26:40 03/06/07 (0)

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