Operating Controls; Front Panel Controls - Henry Radio 3K Classic Mark II Operating And Maintenance Manual

Ei_A 1171 or ECA 1214A
Common---------------------Tap 1
200-21 0 VAC -------------Tap 2
210-230 VAi=---------- Tap 3
230-^^240 VAI.---------- -fap 4
The high voltage transformers are located on the bottom plate of the power
supply section.
SECTION 4. OPERATING CONTROLS
SECTION 4.1 FRONT PANEL CONTROLS
OFF/ON POWER SWITCH - This switch is used to turn the Al; power to the amp--
lifier on and off. When the amplifier is turned off, or when the amplifier
is in the standby mode, the output of the exciter passes directly to the
antenna.
MULTIMF:.TEF' AND RELAY CONTROL SWITCHES - These push-button switches are lo---
cated below the multimeter. There are two interlocked pairs. The two on
the left select the function of the multimeter. The switches select either
:x plate voltage reading (0 to 10,000 VDi.? or a grid current reading (0 to
:L00 ma) on the multimeter.
The pair of switches to the right enables or disables the keying control
circuit of the amplifier.
The STANDBY position makes it possible to oper-
ate the exciter only without turning off the amplifier.
SSl3/i:W SWITCH - This two position rotary switch selects between two plate
transformer taps to assure the correct operating parameters for each type
of emission. The amplifier must be retuned when the switch is changed.
PLATE CURRENT METER - This meter monitors the plate current of the tube or
tubes in your amplifier. The meter scale reads i) to 1 amp DC.
P1LOT
LIGHTS -- The dial lights come on to indicate when the amplifier is
turned on.
FUSES -•- The two 3 AG, E3 amp fuses on the front of the amplifier protect all
the AC circuits other than the high voltage supply - blower, relay supply,
pilot lights, etc.
LOAD GONTROL_ -- This cr,ntrol matches the amplifier's output network: to the
antenna or load. Refer to the calibration chart at the back of the manual
for
appropriate initial settings for the frequency of operation. A load
setting
of zero corresponds to minimum loading and a load setting of 100
corresponds to maximum load capacitor mesh.
TUNE CONTR01.. - The TUNE control is a2r? turn vernier dial connected to the
variable inductor tanL:: coil.
Refer to the calibration chart at the back of
the manual for appropriate initial settings
for the frequency of operation.
.3