How old was the RS35 before it started to buzz?

Could this be as simple as buying another RS35?

Mike va3mw


On Sun, Jun 9, 2019 at 7:54 PM Richard Zalewski <dick.w...@gmail.com> wrote:

> I did two of the Samlex and returned them both.  The fan problem drove me
> crazy.  I replaced it with a MFJ-4230MV and love it.  Quiet cool and good
> metering.
>
> Richard
> *W7ZR* ex:5C5Z, CN2ZR, K2JSP, W6SBZ, W7KXR, K9ZIJ, W9KNF, W0KDF, W0MQU,
> J68ZR, KC6ZR, PJ4/W7ZR, KH2,W7ZR, KH6/W7ZR, V31ZR, VK4AAZ, XE2DV
>
>
> *Be joyful in hope, patient in affliction, faithful in prayer*
>
>
> On Sun, Jun 9, 2019 at 4:39 PM Leroy Buller <lee.bul...@gmail.com> wrote:
>
> > As alway...way cool.
> >
> > Lee K0WA
> >
> > On Sun, Jun 9, 2019, 6:16 PM Jim Brown <j...@audiosystemsgroup.com>
> wrote:
> >
> > > On 6/9/2019 7:52 AM, Peter Dougherty wrote:
> > > > Any suggestions? Within reason, cost isn't a
> > > > major issue.
> > >
> > > Sure. Another linear Astron, maybe bigger, higher power rated. I don't
> > > know how common the buzzing problem is. As Lee suggested, tighten
> screws
> > > and bolts on the one you have if you still have it.
> > >
> > > Another important thing with Astrons is to fix their bonding problem,
> as
> > > described in this link.
> > > http://k9yc.com/PowerSupplyBondingAndAudioDistortion.pdf
> > >
> > > BTW -- I still do the big float-charged battery thing, but it's now a
> > > 100Ah Bioenne Power LiFePO4, and the charger is a spare power supply
> for
> > > one of my Thinkpads, using a  Genasun solar charge controller.  That's
> > > not an inexpensive solution, but it IS a very good UPS for the radios,
> > > AND the supply voltage stays above 13.2V under load as measured within
> > > the K3, there's less IMD on TX. The Genasun controller is RF quiet, and
> > > allows the Thinkpad PSU to charge the battery at about 7.5A. Make sure
> > > that you buy the 14.2V version for LiFePO4 chemistry.
> > >
> > >
> > >
> >
> https://www.amazon.com/Genasun-GV-10-Li-14-2V-Controller-Lithium-Batteries/dp/B01N6AXQZH/ref=asc_df_B01N6AXQZH/?tag=hyprod-20&linkCode=df0&hvadid=198068984819&hvpos=1o4&hvnetw=g&hvrand=17014603795544971507&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9032155&hvtargid=pla-354296381972&psc=1
> > >
> > > I use a separate sealed lead-acid battery to run the other 12V stuff,
> > > which includes antenna switching relays, LED lighting, three LCD
> > > monitors, and several accessories. It's charged by another Thinkpad PSU
> > > with a lead-acid version of the same Genasun controller.  I do, of
> > > course, have multi-turn ferrite chokes on the chargers and on the LCD
> > > monitor power and video lines.
> > >
> > > For about half of my contesting, my K3s run at about 50W driving an 87A
> > > or 25W driving a KPA500, and this DC power arrangement has no trouble
> > > keeping up.
> > >
> > > 73, Jim K9YC
> > >
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