To: | Steve Katz <stevek@jmr.com> |
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Subject: | Re: [BULK] - [Amps] HF and 4cx250b's |
From: | R.Measures <r@somis.org> |
Date: | Sat, 17 Jul 2004 06:12:59 -0700 |
List-post: | <mailto:amps@contesting.com> |
On Jul 15, 2004, at 7:23 AM, Steve Katz wrote: 4CX250Bs require a regulated screen supply, making the PSU design more complex. However, the screen current is so low in a 4cx250B that it often goes negative, so the tube is ideally suited for using a simple zener-string shunt screen regulator connected to the LV end of the HV bleeder-R. http://www.somis.org/D-a-10.GIF This circuit happily protects the tube from any possible failure mode. --- cheerz, Jerry They have enormous gain (about 20 dB), so drive requirements areRichard L. Measures, AG6K, 805.386.3734. www.somis.org _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps |
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