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In Reply to: RE: Hiding in plain site. posted by Tre' on November 29, 2015 at 14:12:11
If a 300B amp had 450V of B+ available before the OPT/plate choke, how much B+ and how much CCS dissipation would be required if one wanted to use a CCS? (let's assume 70mA for plate current)
Now that you have those numbers, what solid state components are available that can handle those demands?
(Things get pretty crazy in a hurry!)
Follow Ups:
Also, since there is no energy storage with the CCS option, you'd need higher B+...with inductive loading, turn down conduction and plate voltage exceeds B+. You'd need to split the dissipation between the final's plate and the CCS. In order to take 'full' advantage of the parafeed OPT, you would need 2x the idle voltage on the final's plate, plus CCS headroom.
That is substantial dissipation for a SS device. With another 500V on top of the 2x one could make a fine, cascade triode/pentode CCS and avoid heatsinks.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
Yeah, that's what I was going after. 1000V of B+ for a cap coupled 300B makes its own set of problems.
"...you would need 2x the idle voltage on the final's plate, plus CCS headroom."
For practical reasons I was thinking a CCS loaded 45.
On the other hand Gary Pimm's "Active 300B Rev3" looks good.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
.
Have Fun and Enjoy the Music
"Still Working the Problem"
No reason you couldn't use a pentode as the CCS. Yes, you'd have to have a seperate heater for it, but hey, who doesn't love having one more tube glowing for all to see?
.
Have Fun and Enjoy the Music
"Still Working the Problem"
.
Have Fun and Enjoy the Music
"Still Working the Problem"
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