I've been using a SB-200 with various rigs (C.E. 100V, Laf. HA-410 (on 10, when 10 was hot), Icom 756 PRO II, Icom IC-706 MKIIG, Johnson Ranger, and Kenwood Twins on AM for the last 15 years. Sometimes I use the Johnson Courier as an alternative to the SB-200. Courier also runs with 572B's. Simple to use, simple to interface, provide an extra fan on top of the SB-200 to exhaust the heat. The SB-200 is a great workhorse. Still using the same 572B's that were put in it in 1969. I generally run the output between 100 and 130 watts.
Pete, wa2cwa On Sat, 18 Mar 2006 07:48:02 -0800 (PST) Jose HF Silva <[EMAIL PROTECTED]> writes: > Hi, > > I have been using this combination and got some good > reports but I have not a reasonable idea of power > output. > So I would like to have a good estimation from those > who are better prepared to do it. > > Thanks^6 > > 73 de Jose' CT1AXG > > > Date: Fri, 17 Mar 2006 22:03:50 -0500 > From: "kenw2dtc" <[EMAIL PROTECTED]> > Subject: Re: [AMRadio] Amplifier to use with my DX-60 > To: "Discussion of AM Radio" <[email protected]> > Message-ID: <[EMAIL PROTECTED]> > Content-Type: text/plain; format=flowed; > charset="windows-1250"; > reply-type=response > > Don K4KYV said: > > "I hear a lot of guys on the air with AM linears, and > most of the time > they > claim to be running way too much carrier for the > tubes they are using. > I > often hear stuff like 200 watts out with a pair of > 811A's or 250 watts > out > with a pair of 813's in g-g. If so, they are cooking > the tubes, or > else the > efficiency is running too high, and they are > flat-topping all over the > place." > > I agree with your comments and yes, there is no doubt > that those rigs > are > flat-topping. I've been running linear amps on AM for > years and I find > that > the cleanest, best sounding signal comes from a > linear with LOTS OF > PLATE > DISSIPATION and HEADROOM. In addition, an audio > signal generator and > an > oscilloscope are mandatory to get clean results. Not > everyone has this > equipment and it is a hobby after all so folks do the > best they can. > > As a rule of thumb I consider the plate dissipation > divided by 3 to be > a > general yardstick for AM linears, some tubes giving a > little more and > some a > little less. In the case of a pair of 3-500Z's I rate > them in the > 333-350 > watt carrier class. So while a pair of 813's can be a > wonderful plate > modulated rig, as an AM linear they are not worth all > the trouble of > building them. It seems to me to be a waste of time > to build an AM > linear > with much less than 1000 watts of plate dissipation. > Of course if you > have > a low power rice box and already own some kind of > linear, well go > ahead, but > if one is building an AM linear, more dissipation is > better. > > 73, > Ken W2DTC >
