Date: Mon, 10 Sep 2012 17:00:52 -0700
From: "Bill, W6WRT" <dezrat1242@yahoo.com>
To: AMPS <amps@contesting.com>
Subject: Re: [Amps] Pulser
I really don't understand why anyone feels the need to use a pulser for tuneup.
If your amp can't do full power for the few seconds needed for a tuneup, you're
pushing it too hard anyway, IMO.
73, Bill W6WRT
## The problem is, for those 1st few secs, the typ (esp new) ham has it off
resonance.
IF the amps were built right, with calibrated tune and load controls, then we
could all just
dial it up by the numbers. Old amps like heath etc, don’t even have vernier
drives on their
tune caps.
## I wouldn’t be tuning up any SB-220 or L4B with a 800 ma dead cxr any time
soon.
Nor any ameritron 811a amp nor their AL-80B amp, etc. That stuff is designed
for ssb,
low duty cycle use, including tube cooling, tubes, xfmr etc, etc.
### I use turns counters that have a 0-100 scale on the skirts. Not only can I
dial up
a particular turn, I can divide each turn into 100 increments. Now that’s on
HB amps,
with vac tune + load caps. A buddy recently retrofitted jackson bros 6:1
verniers
into his SB-220, for both tune and load. They are calibrated 0-100 across
the upper
180 deg arc of each skirt. That mod alone, makes tuning the sb-220 a heck of
a lot easier,
esp on the upper bands. Each JB dial drive has a 2” diam skirt. They also
make em in
bigger diam skirts.
Jim VE7RF
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