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In Reply to: RE: Hey Mike, how about this idea? posted by danlaudionut on April 28, 2009 at 23:10:22
Hey DanL,
thanks a lot for the ideas.
I've gone back and looked at the 76 plate curves and done a lot of rethinking, keeping in mind the "toughest load" situations of either 15K or 20K, even though from Mike's post, the Cobalt 15K B7's will be "lighter", especially if in parallel with just a C4S (my thinking -- and maybe the 15K or 20K models would apply for the Cobalt 15K B7 + the appropriate plate choke?). I'll do this on an existing platform, rather than change the amazing looking FP3 kit I've been staring at. Given a mu of about 9, there wont be a plate voltage swing of more than 20vrms, probably. I'm seeing that given the C4S plate loads + 300V regulated B+ that are on the existing platform, deepest class A would look something like this:
@5mA, 15K load, 170Vp-k, -8Vg 50vrms swing
@5mA, 20K load, 185Vp-k, -9Vg 70vrms swing
On the 76 data sheet, plate loads of 50K and 250K are mentioned, so it is a logical stretch to apply (even) a (nominal) 15K load to the plate, but the numbers look okay to me now to give it a try.
I've got to order some parts before I try this out. I'll keep the exo-010, 1:1 input transformer (thanks Mike) and not loading the secondary output in mind as I proceed.
Thanks again, --keto
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