Amplifiers and Vacuum Tubes Tuning Loading and Arcing

 

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Arc protection AL572 ]

Gettering Tubes AL572B AL80B ]

Clipperton ]Collins 30L1 ]


 [ ALC Exciter Power Overshoot ]
 Bandswitch Failures ][ Blocking Capacitor ]
Cathode and grid Bias ]
CB Amplifiers Converted to  Ham ]


 [ Filament Voltage life ]
]Electronic Dynamic bias HF SSB CW Amplifier ]
[ Fault Protection ]


FL2100 Modifications and Repairs ] [ Grid resonance ]
HF Stability ] [ Loading and Tuning linear amplifier ]
Metering amplifier or transmitter ] [ Neutralizing  Amplifier ]


Ameritron TR T/R Relay Module ]
Relay RF System Timing or Sequencing ] [ Relay amplifier buffer ]
Relay Contact Cleaning Burnishing ]


 [ Power line voltage ] [ Power supply Inrush protection ]

RM HLA-150 test ] [ SB-221 ] 
Shortwave Broadcast Amplifier ]


Tank Circuit ] [ Tank Voltage ]
Tuned input circuit ] [ Vacuum Tubes ]
Vacuum Tube Amplifiers ] [ VHF Stability ]


572B Problems ] [ 572B tube preconditioning ]
8877 failures ] [ SW BC amp ]
RF Plate Choke ]


 [ Kenwood TL922 Amplifier ] 
AM Linear Amplifiers ]  [ Tuning Aid TOF1 ]
Ameritron ALC adjustment ] [ Screen Supplies ]

 

Business Page Link (full line of amplifier
parts and services)  CTR Engineering, Inc

Ameritron Equipment

AL811
Changes

AL811 Tuning

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

Grid driven tetrodes

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

3-500Z arcing gassy tube


572 Arcing


572B tube red ceramic glow


                            

 

572B arcing and failures

 

 

 

 

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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