Amplifiers and Vacuum Tubes Tuning Loading and Arcing
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Business Page Link (full line of amplifier
parts and services) CTR Engineering, Inc
Ameritron Equipment
811A Tube History and Construction
Trouble Shooting Guidelines Ameritron Tube Amplifiers
Amplifier Operation
SB-221
Tank Voltages and
the parasitic myth
Tuning
or loading an
amplifier
Grounded grid (cathode driven)
amplifiers
AM Operation
also (AM Modulation)
Preamplifiers
Receiving
amplifier
measurements
Vacuum Tubes
Trouble Shooting Guidelines Tube Amplifiers
Vacuum
Tube Amplifiers
how the PA vacuum
tube converts dc to
RF
Working model
for understanding
how PA RF voltages
are created and how
amplifiers behave
under various
loading and drive
conditions
Vacuum
Tubes,
arcing, vacuum tube
failures, advantages
and disadvantages of
each type of
power-grid vacuum
tube, vacuum tube
grid failures,
vacuum tube anode
failures, maximizing
vacuum tube life,
and quite a bit
about how power grid
vacuum tubes
actually function
Placing new 572B tubes in operation, or preconditioning 572’s.
Components
Tank
Circuits two
models showing tank
voltages, currents,
loss, and phase
shift
Bandswitch
Failures
discusses the many
common reasons for
amplifier tank
system switch
failures
T/R
relays and relay
timing,
including amplifier
relay sequencing
that will work with
vacuum relays
Inductors
while this deals
mainly with loading
coils, it is also
true for
amplifiers
Stability
HF
Stability HF
instability or
instability near the
operating frequency
of an amplifier is
by far the most
damaging for of
oscillation. This
problem plagues
amplifiers like the
Collins 30L1,
Dentron Clipperton
L, and Yaesu
FL2100.
VHF
Stability
Parasitics discusses
causes of
instability. Has
spice models,
pictures of
resistors internal
construction. Your
replacement carbon
composition resistor
might not be a
carbon composition
after all!
Arcing Causes
Antenna
and antenna system
failures
that cause power
amplifier arcs
Poor
or improper relay
sequencing
causing power
amplifier arcs. This
is a common problem
in TL-922 Kenwood
amplifiers
Improper
Drive and Amplifier
Tuning how
incorrect drive and
loading adjustments
cause power
amplifier arcs,
especially with
exciter power
overshoot
Amplifier
Tube Arcs causes
and cures including
real reasons why
grid chokes fail.
This is a common
problem in the
SB-220 SB-221,
TL-922 and other
amplifiers.
Improved arc protection for AL572 amplifier
Future
Articles
Choke selection
will describe the
proper selection and
construction of RF
chokes
More pages
soon……
visits
since January 2004
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