[Amps] SB-220 HV Transformer Wanted

[mark bitterlich]

Ok, this brings up a technical question that pertains to the topic amazingly enough. When you shift from single sideband to CW on this amp are you or are you not moving the class of operation from AB1 towards AB2 and thus  improving efficiency?MarkWA3JPY
-------- Original message --------From: "Joe Subich, W4TV" <lists at subich.com> Date: 10/30/19  16:36  (GMT-05:00) To: Joe <nss at mwt.net>, amps at contesting.com Subject: Re: [Amps] SB-220 HV Transformer Wanted On 2019-10-30 3:12 PM, Joe wrote: > Why need them?Some people prefer to keep their equipment "stock" or at leastfunctionally stock.  The SB-200 was never designed for 1500Woutput on CW - it was designed to operate at 1 KW DC input (ca.700 W CW or 1500 W PEP SSB output).Pushing the SB-220 to 1500 W CW output (or worse, running RTTYon the high taps) is a quick way to fry something.  Even thetoroidal transformer you recommend is only rated for 800 W!73,    ... Joe, W4TVOn 2019-10-30 3:12 PM, Joe wrote:> Why need them?> > Run it at the HV side and use less drive and less currents all around.> > The CW/SSB switch I converted into a stand-by switch.> > Joe WB9SBD> Sig> The Original Rolling Ball Clock> Idle Tyme> Idle-Tyme.com> http://www.idle-tyme.com> On 10/30/2019 1:38 PM, Joe Subich, W4TV wrote:>>>> >> https://www.antekinc.com/as-8t800-800va-transformer/>>>> Unfortunately, this transformer lacks the primary taps for CW/SSB>> operation of the OEM device.>>>> 73,>>>>    ... Joe, W4TV>>>>>> On 2019-10-30 10:23 AM, Joe wrote:>>>>>> On 10/30/2019 8:56 AM, Joe wrote:>>>> Morning Dick,>>>> If you are not afraid of making a few electrical and mechanical >>>> modifications, I would go with this transformer.>>>> https://www.antekinc.com/as-8t800-800va-transformer/>>>>>>>> I'm glad I did! 1/4 the cost of most drop in replacements. yet MUCH >>>> better performance!>>>> Joe WB9SBD>>>>>> _______________________________________________>>> Amps mailing list>>> Amps at contesting.com>>> http://lists.contesting.com/mailman/listinfo/amps>>>>> _______________________________________________>> Amps mailing list>> Amps at contesting.com>> http://lists.contesting.com/mailman/listinfo/amps>>>>> > _______________________________________________Amps mailing listAmps at contesting.comhttp://lists.contesting.com/mailman/listinfo/amps