Jim,
Especially agree with you in regards to the airdux, what a shame.
Lane
Ku7i
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]
On Behalf Of Jim Thomson
Sent: Tuesday, March 23, 2010 5:56 PM
To: amps@contesting.com
Subject: [Amps] Good engineering
ORIGINAL MESSAGE:
On Mon, 22 Mar 2010 19:31:09 -0700, "Jim Thomson" <Jim.thom at
telus.net>
wrote:
>
>## I wouldn't be holding Command or anybody else up as any kind of
>'standard of engineering excellence.' If these ham amps were built
right,
>they would all have individual, adjustable bias for each tube, plus
mating
>metering, real bandswitch's and real tank coils, and plate xfmrs... and
maybe
>toss in a real tube..... and not something with a floozy 4 watt
delicate grid.
REPLY:
Any fool can overbuild a product. Good engineers know when to stop,
and good engineers get paid good money to get it right.
73, Bill W6WRT
## Bill , got any idea what 3 x NEW EIMAC 3CPX-800A7's cost these
days? ##That's the tube line up used in the HF-2500E.. really smart.
The 12 ga wireroller inductor,used in the 10 kw palstar ant tuner is a
joke, along with SO-239's,and the mickey mouse balun on the INPUT of the
tuner.. which will explode. Toss in undersized tank coils, bandswitch's,
mickey mouse tune/load padding schemes,t/r relays that hot switch, and
you wonder why the HB amp builder gets into designingand building his
own stuff. Ten tec brags abt the 3.5 kva CCS xfmr used in the
centurion,and sez it's good for 7 kw.."IVS" [int voice service], yet it
barely does 1.3 kw pep out....[almost legal limit]. A buddy accidently
had his cat fall asleep on his footswitch for 2 hrs.His 87-A was
pumping out a 1.5 kw FM cxr on 29.650 mhz. He had the optional cooling
fan.The RF deck had turned into molten glop ! Alpha tech tells him.....
" don't believe the hype"The home builder has the luxury of using what
ever components he wants.. and can get hishands on. Typ ham amps have
cut every corner there is. 1/4"-3/8"-1/2" cu tubing is cheapat home
depot... so why melt airdux ? Ceramic vac caps are readily available,
so I use em fortune and load. If something is marginal... I re-design
it. Who's the fool ? later... Jim VE7RF
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