RE: ST-70 upgrade plan/path

K&K Audio / Lundahl Transformers

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In Reply to: RE: ST-70 upgrade plan/path posted by nerdorama on January 27, 2014 at 12:48:05:

The output transformers will take far more bias current than the original power transformer will deliver and remain whole. However, the real limitaiton is the tube's capacity. The tubes you suggested have a pretty well-defined 21 watt max dissipation rating and the 430VDC raw supply less the 40VDC of cathode voltage puts 390V across the tube. With a bias current of 50mA, that's 19.5 watts...

Kevin Carter
K&K Audio
www.kandkaudio.com

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Follow Ups Full Thread

Topic - ST-70 upgrade plan/path - nerdorama 12:13:33 01/26/14 (3)

RE: ST-70 upgrade plan/path - KevinC 05:24:41 01/27/14 (2)

RE: ST-70 upgrade plan/path - nerdorama 12:48:05 01/27/14 (1)

RE: ST-70 upgrade plan/path - KevinC 17:36:03 01/27/14 (0)

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RE: ST-70 upgrade plan/path - KevinC 17:36:03 01/27/14 (0)

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