Subject: Re: [Amps] QST
Also, note that when the vox relay pulls in, you are now running at zero
bias. Not too swift an idea for Z tubes.
In addition to the two aforementioned guffaws, I have spotted several more.
Maybe we should have a contest to see who spots the most errors in the
article??
The author refers to two Eimac technical bulletins that recommend direct
strapping of all the grid pins to chassis, and using a simple L/C to chassis
for the tuned input. Is there a web site where these bulletins can be
downloaded? This would solve two reoccurring hot topics that show up here,
and on other reflectors from time to time. (if such bulletins exist!)
(((73)))
Phil Clements, K5PC
Bill, in that same article, the bandswitch of the SB-221 (pi net output
section) had a floating rotor connection -- the bandswitch as shown wouldn't
do anything. I remember spotting that when I glanced at the article and
started chuckling...
WB2WIK/6
-----Original Message-----
From: Bill Fuqua [mailto:wlfuqu00@uky.edu]
Sent: Monday, December 18, 2006 8:43 AM
To: AMPS
Subject: [Amps] QST
I am becoming more and more disgusted with the lack of technical
knowledge QST authors. A fine example is the article about reviving old
linear amplifiers in the most recent QST. There is a schematic and
description of a half-wave voltage doubler which is claimed to have been
used on many older amplifiers. But, everyone that I have seen uses
full-wave voltage doublers. The only half-wave voltage doublers I have seen
are usually in TV sets and other tube equipment that operated off the power
line with out a transformer.
73
Bill wa4lav
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