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Hi Matt, Matching is good thing. The obvious advantage is double the plate current and half the impedance which would make the primary more manageable I would think. We have seen plenty of dual tube 833A's or C's in the archives. I still have some interest in that, as big iron will retreat with my advancing years. I have four original EF Johnson sockets and the original plate and grid heat sinks rat holed. I have some used 833a's but when I go after this the C versions are more available now. Please post your experiences. It seems to me John Freau was one of the go to guys on this subject. He had a wicked picture on his old AOL site of a pole pig driven one into near melt down ;-^) Jim Mora -----Original Message----- From: Tesla [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of mddeming--- via Tesla Sent: Saturday, August 16, 2014 4:21 PM To: tesla@xxxxxxxxxx Subject: [TCML] VTTC question. Hi All, I was wondering if 833s can be paralleled in a Hartley or Armstrong oscillator circuit, or if the small differences between them would cause one to do all the work while the other just provides heat for the shop. I have 4 and was thinking of using them in pairs on each side. Anyone have experience in this? Matt D. _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla