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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Re: best driver tube(s) for 300B's PP using interstage tx? posted by Russ57 on July 25, 2006 at 05:38:27:
The Lundahl LL1677, which is for SE to SE and for driving the 300B, has a 1:2 stepup ratio, will run 80 ma quiescent through primary, at 80 ma it's at 1.2 Tesla's leaving 0.4 T for swing (I'm assuming 0.8 T for peak to peak); the primary inductance is 24H at - shoot I forget, 30Hz I'm pretty sure - and will put out 410 volts peak to peak.Is this enough? Somehow I didn't get the primary impedance. I will also go on KandK, the forum's U.S. distributor for Lundahl, and see if they have some quick and likeable answers.
Could the 6L6GC drive this IT tx for the 300B? That would be ideal for me, I love this tube, and my circuit is already optimized for it.
Cheers. If I find out anything there I'll let you know, but by all means any ideas you have right now I would treasure, you know that. By the way, can I add on a complicated (maybe not) question?
I was surprised to see that most of the IT tx's were essentially 1:1; this is the only one I saw so far that stepped up. So, I'm confused here. Is the only reason we're using either a capacitor or an interstage transformer to couple a driver to an output tube the expense of an additional power supply? Why not just direct drive? Or does it also have to do with limiting parasitic oscillations and eliminating lots of really high frequency power robbing extraneous stuff? Explanations most appreciated; I AM starting to understand them. Thanks, as always. :)
"It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking a chance on me when I wanted to be an engine mechanic.
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Follow Ups
- have some info for you on the IT tx's - radiance 01:01:41 07/26/06 (0)
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