To: | Alberto <re349@yahoo.com> |
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Subject: | Re: [Amps] QB3-300 Amplifier |
From: | R.Measures <r@somis.org> |
Date: | Thu, 28 Oct 2004 08:06:47 -0700 |
List-post: | <mailto:amps@contesting.com> |
On Oct 28, 2004, at 4:44 AM, Alberto wrote: Hello! Alberto -- This will produce so much IMD on SSB that you would do well not to give your call-sign within 15kHz of a band edge.
I think they know what they are talking about because 4-125As are not ideal for grid-driven linear service. If I was building a SSB linear using 4-125As, I would use a 200w transceiver, drive 6 to 8 of the little suckers in parallel. and use more than 2500V on the anodes for SSB. The reason for more PS V on SSB is that the 2500V rating is for plate modulation, which means that the 4-125A has no problem with a peak anode supply potential of 5000V during 100% AM. Thus, my guess is that you could use a 4000v anode supply for SSB -- provided you did not use AØ/NØN during tuneup, but instead tuned up with 50wpm dits or tuned up with a tuning pulser.. With AØ at 4000vdc, one should expect to burn a few holes in the tantalum anodes.
Richard 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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