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RE: What tubes to use with this Interstage Transformers?


I'm using one of the HA series (I don't remember which one, possibly HA-108). It is being used parafeed to PP grids (1~;1.2+1.2). I've used parafeed before, successfully. The problems I am experiencing, I attribute to the step up design to power grids. Some engineering buddies told me that step ups will be problematic and crap out into grid current, and they were right. Gain is not free.


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