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Philco 80 Jr, just starting....
LASJayhawk
Senior Member
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Posts: 289
Threads: 40
Joined: Oct 2011
City: Las Vegas, NV
#14

02-13-2012, 01:33 AM
Transient peak plate current! Icon_clap

As the source voltage goes up or as you increase the capacitance in a capacitive input filter you have to increase the plate source impedance or you risk exceeding the transient peak plate current and the tube striking an arc and making a bad mess of things. (end of tube, cap and xformer)

I now recall a Majestic cathedral and an experiment with a 47uF 450 V cap that ended quite badly. Icon_redface


Now I'm gonna have a beer and kill off that brain cell for good.
John
Las Vegas, NV USA
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Messages In This Thread
Philco 80 Jr, just starting.... - by morzh - 01-28-2012, 08:35 PM
RE: Philco 80 Jr, just starting.... - by morzh - 02-28-2012, 11:21 PM
RE: Philco 80 Jr, just starting.... - by morzh - 03-14-2012, 11:05 PM
RE: Philco 80 Jr, just starting.... - by codefox1 - 03-15-2012, 12:25 AM
RE: Philco 80 Jr, just starting.... - by morzh - 03-15-2012, 09:44 AM
RE: Philco 80 Jr, just starting.... - by codefox1 - 03-15-2012, 11:20 AM
RE: Philco 80 Jr, just starting.... - by morzh - 03-17-2012, 12:14 AM
RE: Philco 80 Jr, just starting.... - by morzh - 03-21-2012, 02:35 PM
RE: Philco 80 Jr, just starting.... - by morzh - 03-21-2012, 10:03 PM
RE: Philco 80 Jr, just starting.... - by morzh - 03-21-2012, 09:56 PM
Re: Philco 80 Jr, just starting.... - by morzh - 01-29-2012, 02:24 PM
Re: Philco 80 Jr, just starting.... - by morzh - 02-05-2012, 05:23 PM
Re: Philco 80 Jr, just starting.... - by morzh - 02-06-2012, 05:31 PM
Re: Philco 80 Jr, just starting.... - by morzh - 02-11-2012, 07:25 PM
Re: Philco 80 Jr, just starting.... - by codefox1 - 02-11-2012, 08:50 PM
Re: Philco 80 Jr, just starting.... - by morzh - 02-12-2012, 10:14 PM
Re: Philco 80 Jr, just starting.... - by LASJayhawk - 02-13-2012, 01:33 AM
Re: Philco 80 Jr, just starting.... - by codefox1 - 02-13-2012, 03:22 PM
Re: Philco 80 Jr, just starting.... - by morzh - 02-13-2012, 05:37 PM
Re: Philco 80 Jr, just starting.... - by morzh - 02-15-2012, 11:50 AM



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  1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration