My first HB project was a single tube 6L6, 25 watt transmitter in 1963. It had
plug-in coils to change bands. I was a new novice and got a pink slip from an
OO for chirp! I guess the power supply regulation wasn’t that great.
I tried posting a photo of my 2 latest homebrew projects but I guess the file
size was too large. They were my 4 band microwave transverter system (2.3, 3.4,
5.7 and 10 GHz all QRO) for my multi-band rover rig… and my stand-alone 24 GHz
QRO system for mountain toping and rover contesting…
My, how time has flown over the past 50 years… Happy New Years to all… I wish
you all well and great home brewing.
73,
Dave W6TE
Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10
From: Roger (K8RI)<mailto:k8ri@rogerhalstead.com>
Sent: Friday, January 6, 2017 7:05 PM
To: amps@contesting.com<mailto:amps@contesting.com>
Subject: Re: [Amps] Decline of homebrewing?
My first project was a pair of 6L6s driven by a 6AG7 on the novice
bands. I built it on the corner of an old TV chassis in 61. In those
days a B&W TV PS was as robust as a Collins PS. It looked crude and
rough but it worked fine.
My second project was rebuilding a 6C21 into a pair of 813s. You could
purchase all the "good" 6C21s and 813s you could afford for $5.00 ea.
Unlike now days, a gassy 813 was rare. However, that was in 61-62, or
abt 55 years ago
The PS didn't even have a cover, but was well out of the way, so I
couldn't put my feet on it. OTOH I had courses in electronics, TV, and
Instrumentation, so I was comfortable around HV. OTOH, I was 21 before
getting into Ham Radio. I had learned the CW in Boy Scouts, but that
had been so long ago, I had to learn it again. 5 WPM was easy. 13 WPM,
not so much. I spent a lot of time on CW after earning the General
class. I'd tune in a good sounding conversation and stretch out on the
couch. Before long, high speed CW was like listening to someone talk.
73, Roger (K8RI)
On 1/6/2017 8:17 AM, Jim W7RY wrote:
> I completely disagree!
>
> My first amplifier project was at age 16, shortly after I got my
> general class license.
>
> I modified (and extensively at that) a amplifier that was homebrewed
> by someone else. I removed the choke in the power supply, converted it
> from tube rectifiers (3B28) to 1N4007s that I bought from James
> Electronics, built a tuned input circuit, built my own high voltage
> probe with 1 megOhm resistors and used it with my Radio Shack range
> doubler voltmeter, and then used it extensively on 40 meters SSB on
> 7235. AND lived to tell about it! But then again, I'm very confident
> around high voltage.
>
> And this was in 1961 give or take. About 55 years ago. The 3 leg
> fuses were just on the horizon.
>
> 73
> Jim W7RY
>
>
> -----Original Message----- From: sm0aom@telia.com
> Sent: Friday, January 06, 2017 1:18 AM
> To: amps@contesting.com
> Subject: Re: [Amps] Decline of homebrewing?
>
> This was written almost 50 years ago, and gives some food for thought
> even today:
>
> "Homebrew Kilowatt
>
> Dear 73,
>
> Did you ever write an article that you later wished
> you had not written? I have written several. The latest
> is the 6KG6 KW amplifier appearing in January 73.
>
> The third paragraph states, "It is assumed that the
> ham who starts out to home brew a kilowatt is not
> embarking on his first construction project".
>
> You wouldn't believe the letters I have received from
> neophyte hams, who, by their very questions, reveal
> that they have never built anything at all. So suddenly
> they decide to build a KW with 2000 volts on it.
> I sincerely hope nobody gets electrocuted as a result
> of my article.
>
> I belive you need a good article entitled, "If you
> want to get your feet wet, start at the shallow end of
> the pool". Then go on to describe a good linear (or
> other amplifier) that has a supply of less than 500
> volts. Go through it piece by piece and explain what
> the parts are for and why they have to be within
> a certain size range. The stock question about the
> above amplifier was "What's the size of the capacitor
> between the plate and the pi-network? This is noted
> in at least ten places in every handbook in the land.
> A ham who doesn't comprehend even vaguely, the pur-
> pose and limitations of a dc blocking and rf by-pass
> capacitor, has no business building anything as lethal
> as a KW final,
>
> R. D Baird W7CSD
> Klamath Falls, Oregon"
>
> 73/
> Karl-Arne
> SM0AOM
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