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VA2NA did an extensive IMD write up on the Amptec LA4000, back on Oct 22, 2017. It's Item #15, under 'files' on this site. Uses 2 x FU-728's....and runs 4 kw output. Appears to be a clone of a manual

Hsu and his partner who sold the HF 2013 amplifier back in 2013 had broken off the partnership and his partner went on to start the Amptech company. ?Hsu was supposed to come to Dayton in 2013 to

Anybody seen or heard anything from our friend Hsu lately. I sent him an email a few weeks ago and have heard nothing back from him. 73, Alek. VK6APK. -- From sunny Binningup Family Businesses: SP

I talked with Bill a few times and even bought some of the stuff he no longer had the time for. I hated to see he's gone. There are fewer and fewer of the knowledgeable left and few with any knowledge

Well, shit. Another good one gone. RIP Bill. 73 Randy KZ4RV

I?m sorry to see this. Did have a number of QSO?s with Bill. RIP OM de Jim SM2EKM Den 2019-06-20 kl. 23:31, skrev jim.thom@... [ham_amplifiers]:

Saw this on.... 'amps'...posted by Rob, K5UJ. "Saddened to see Bill Turner, W6WRT listed in July QST Silent Keys." ## Bill was a nice fellow, and provided some good insight + ideas / fixes on a lot of

Trus rms voltmeters work really good with ratty waveforms. They will handle anything you throw at em...including sawtooth, square waves, and loads of harmonics. True rms ac ammeters, good ones, have

What precision do you want? For what you probably want, I would think a true RMS volt meter of a known accuracy within a couple % and a known resistance should suffice as measuring the calibration,

A thermocouple meter will measure true RMS regardless of the waveform. Old school stuff.

A few years back, on some FB group I belonged to at the time, I forget which, somebody posted a picture of a large industrial transformer, I'll guess it was maybe 10' square and 8' tall, I really

Somewhere, AG6K is smiling... 73 Randy KZ4RV

<The garbage coming off the power line, as well as "in house" appliance <generated trash doesn't give us much better. The old Amp meters can <give us effective amps based on heat and those don't care

The garbage coming off the power line, as well as "in house" appliance generated trash doesn't give us much better.? The old Amp meters can give us effective amps based on heat and those don't care

If you look at the distorted waveform coming out of the FWB, FWCT, FWD, it typ consists of high, peak pulsed currents.... when a C filter is used. Like 15-24A on peaks....and only 1.5 to 1.7 msecs in

<Henry had been using the resonant choke PS since before many on here were <born and they worked fine until the resonating cap developed leakage and the <value changed. <The transformers were old

Henry had been using the resonant choke PS since before many on here were born and they worked fine until the resonating cap developed leakage and the value changed. The transformers were old design

<I've seen mention on this list of Rauch trying to blow himself up doing something with resonant chokes, but I <wasn't privy to the actual event. What was the story there? <73 <Randy <KZ4RV ## simple

RAUCHEN VERBOTEN!!! Unless he sets himself on fire.... ham_amplifiers@...> wrote:

I've seen mention on this list of Rauch trying to blow himself up doing something with resonant chokes, but I wasn't privy to the actual event. What was the story there? 73 Randy KZ4RV