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Original Message
powerdrive
Posted by RayP on February 11, 2019 at 17:09:49:
Since you expressed interest in the Tubelab site, you might like to investigate Powerdrive which is relatively easy to implement and would fit in better with your lowish B+. You might remember my GK-71 amp which uses Powerrdrive. It also uses high frequency AC heating that was the subject of a long thread. That a look here to refresh your memory.
http://rh-amps.blogspot.com/2014/06/rh813-flagship-project.html
also
https://db.audioasylum.com/mhtml/m.html?forum=tubediy&n=251288&highlight=halogen&r=&search_url=%2Fcgi%2Fsearch.mpl%3Fauthor%3DAmpzilla
ray