[Boatanchors] amp question

[David Propper]

Ray,

A better solution might be to use a Heathkit SB-200 or SB-220. Much better built amplifiers.

fwiw,
Dave, K2DP

> On Jan 30, 2019, at 4:35 PM, RAY FRIESS <rayfrijr at msn.com> wrote:
> 
> OK, I've been a ham for 50 years now, and as such, I've learned a lot of things, but I admit theres still a lot I can learn.  This is one of those things.
> 
> I have a Knight T-60, which as we old timers know, puts out a low power AM signal.  I've been thinking of putting it on AM, but would like a bit more power.  We are all also familiar with the Palomar amps and their problems, etc.  They put out a crappy signal with spurious emissions, etc etc etc.
> 
> The thing I'd appreciate you guys educating me about is WHAT is it about say the Palomar 600 that causes all the well known problems?  It's basically a sweep tube amplifier, and in our ham careers, we have probably used a number of sweep tube amps, and some may still be using one, such as the old Swan or Dentron amps.
> 
> Is it Palomar's design, bias, filtering, or what that makes it have such a bad reputation?
> 
> What I've been pondering is, instead of building an AM amp, which would itself use a lot of the same components in the Palomar, could circuit changes be made to it to make it a good amp that puts out a good clean signal if it were driven by a low power rig like the T-60?  It is bandswitched for 40 through 10 already.  It has basically the same components as any homebrew or commercial AM amp ...  a pi network, power supply, bandswitching, etc.
> 
> I'd really like to be educated by you guys or gals here.   Like I said, I know a lot after 50 years, but I'm always interested in learning what I don't know.
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