Thanks Ron. I read the section several times because not having done anything like this before made me a little nervous. I wanted be sure I wasn't missing anything. My two other amps require changing lead configurations as well as fuses. My HV is now 72 volts with the KPA-500 plugged into a 220v outlet. So that's just shy of midrange. I get about 550 watts peak output (just makes this value on voice peaks) with 30 watts of drive.
73, Doug -- K0DXV On 7/9/2011 12:11 PM, Ron D'Eau Claire wrote: > That is correct as far as changing between 115 and 220VAC mains goes, but > there's a little more to it than that. The power supply is not regulated, so > its output can vary depending upon the actual mains voltage supplied within > the nominal 115 or 230VAC ranges. > > Secondary taps on the power transformer allow you to compensate for normal > variations in mains input voltages to produce the correct d-c output voltage > from the supply. The output voltage should be checked and the taps adjusted > as necessary any time you move the amp to a new mains outlet (or, of course, > if you switch from a 115 to a 230 VAC mains supply). > > This is all described under "Mains Voltage Settings" in the Installation > section of the manual on pgs 6 and 7 in the Rev B manual. It's immediately > after the information on installing the fuses and the fuse holder. > > The procedure involves only removing the top cover and attaching the tap > wire to the rectifier board that produces a voltage in the proper range as > indicated on the KPA500's LCD. The wires use spade connectors that require > no tools to connect. > > Ron AC7AC > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Doug Person > Sent: Saturday, July 09, 2011 10:46 AM > To: [email protected] > Subject: Re: [Elecraft] Operating KPA500 on 220V > > I meant to say change the fuses and reconfigure the fuse block... I was > actually reading the manual when I asked that question. On other > amplifiers I was required to change internal transformer wiring to setup > for 220v. That's what I meant to ask. > > So switching the fuses and changing the fuse block is all I need to do. > No other internal wiring required. > > Doug -- K0DXV > > On 7/9/2011 9:43 AM, Ron D'Eau Claire wrote: >> When you change the fuses, you insert the fuse holder so 220 is visible in > a >> little window instead of 115. That changes the wiring to the power >> transformer input for 220 volt mains operation. It's described at the >> beginning of the Owner's manual. >> >> Ron AC7AC >> >> -----Original Message----- >> Am I correct in assuming that in order to run the KPA-500 on 220 volts >> all that is needed is to change the fuses to the provided 6 amps, wire >> the correct plug on the power cord and the power supply will adjust >> accordingly? >> >> Thanks, >> >> Doug K0DXV >> >> > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
