Amp Supply LA-1000 User manual

AmpSupply Co.
Limited Warranty
imp Supply ( o, h~arruttts to the original piwftasct. that iJiiv jw d w / shitil he free from defects
in material fw e p t tubes and ttF ampul transistors) or workmanship fo r one ( f year frotn ¡he
(fate of angina] purchase.
f>urit\ii the warranty period the Amp Supply Co. or wt authorized Amp Supply Co. service
facility w ill provide free o f charge both ports {except tubes and ftF output transistors} t/nd
iniu>f it) corrert defects in material w workmanship.
To ohtmn yjt /r warranty service, the original purchaser must:
fit t otnpfcle ami wnrf w the Warranty Registration Card.
\o tify -Imp Supply i n. or its nearest auihvrized' vr\'k'efm H ity, as soon as possible after
tU'xi overy ttf a fw&sibie defeet, of:
fat The model number and serial number, i f wry;
ih} The identity o f the setter swwi the’ approximate dale 0/ purchase;
(i 7 A detailed desi'riptiot1 o f tiw pndth’tn, including details ok the electrical connection
to ussrHinted enuifftnettt anti (fe1 Ust o f such etfuqtutcst.
.fjf th'Jhvr the prtMiurt tt> Am p Supply (*>, or the nearest authorized service facitity. or
\hip the some in us origiitai container or eyuivaltni, fu lly insured and shipping charges
pn'/taid.
( \>rra't maintenance, repair and use are important to obtain proper performance from this
protttift. Therefore, carcfuity read the nstruction Manual* This warranty does not apply to
any tie fe d that Am p Supply Co. determines is due to:
//> }mpro/h‘r maintenance <v repair, incittding the installation o f parts or accessories that do
not conform to the t/uafity and specifications o f the original ports.
f2) ViiitfSf, abuse, neglect or improper installation,
li) Ac tridental or intentional damage.
Ati iniftiivd warranties, if any, terminate orte 11} year from the date o f the original purchase.
The foregoing com tiiutes Amp S upffy Co.rs entire obligation with respect to this product, and
the original purchaser and any user of owner shall have no other remedy and n& daim fo r in
cidental or consetpuntiai damages Sottte Uufrs do not alkxw limitations on how long an im 
plied warranty lasts or dm not aikrw the exclusion or limitation o f incidental or consequential
damages, so the above bmrtotion and exclusion may not apply ra you.
This warranty p m specific legal right t and yov may also Ikuv other rights which vary from
state to sttitt
Amp Supply Co.
2071 Midway Drivp, P.O. Box 421, Twinsburg, O io 44087
[phone]* TLX 980131 WDMR

Amp Supply Co.
LA-1000
Portable Kilowatt SSB or CW QSK Amplifier
r ^ O
Q, lgu

SPECIFICATIONS
Frequency coverage: 3.5—21,5 MHz amateur bands
export model Includes 10
meter band*
Power input: 1000 W PEP SSB 700 W CW
QSK: full break-in CW
Drive requirements: Typically 100 W PEP
Input impedance: 50 o m tuned-input, low pass
pi-network type
Output impedance: adjustable pi-network, matc es
50-70 o m wit SWR of 2:1 or
less.
Intermodulation distortion products: In excess
of -30 dB below PEP
Power requi refnents: 120 VAC 50/60 Hertz
15 amps or 240 VAC 50/60
Hertz 7.5 amps
Tubes: Four 6MJ6 - included wit amplifier
Dimensions: W 11“ H 5.00” D 9.75”
Weig t: 22 lbs.
WARNING
For proper operation of t e cooling system,
t e LA-1000 must be placed on a fla t smoot
surface. Do not operate on a furface suc as
carpeting as t is w ill impead t e air flow
t roug t e cooling oles located *n t e bottom
of t e c assis.
WARNING
Make no attempt to put t is amplifier into
operation outside of It's cabinet. Contact wit
voltages inside t is amplifier can*be fatal.

PARTS LIST
61 Blower
C1-C3; ,01 1KV
C15-C2S; .01 1KV
C31^(Î34; .01 1KV
C4-C13 #427 Trimmer Capacitors
C14 1000 uf 25v
C27 .OOluf 5KV
C28-3G 125uf 500v
C35 .002 5KV
C36 250pf Variable
C37 220pf DM19
C38 llOOpf variable
01 LED (Part of S2)
02 LED {Part of SI)
03 1N4007
D4-D11 M4G5
012 IN3321
FI 15A Fuse
Jl, J2 $0-239
J3 RCA Connector
L1-L5 Input torroid coils
L6 Tank Coil (30MHZ-14MHZ)
L7 Tank Coil (14MHZ-3.5MHZ)
PC1-PC4 Parasitic c okes
RFC1 Plate c oke
RFC2 Cat ode c oke
RFC3 2.5mH
RI, R2 680 K
R3-R6 100k 2w
R7-R9 500k 1%
RIO .4, 1%
Rll lo m lw
RLY 1 DPOT
RLY 2-S OPST
XI Xm1t Lamp 12v ,
nMeter Lamp 12v
V1-V4 6MJ6 Tube
SI, S2 SPST Toggle
S3 DPDT Rotary
S4 Band Switc
T1 Power transformer
Ml Plate meter

noti
DISCONNECT UNIT FROM AC LINE
Remove eit er 117 VAC or 234 VAC jumper(s)
before c anging from one to anot er.
E
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o
L*(0
L - J g . o
I
117 VAC
TUNING PROCEDURE
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234VAC
1. Plug t e LA-1000 into a 117VAC source.
2. Set t e Pwr/on switc to t e on position.
Set t e STY/OPT switc to t e STY positions.
ALWAYS ALLOW 3 MINUTES WARM-UP TIME BEFORE APPLY
ING DRIVE POWER TO THE LA-1000.
3. Set t e Meter switc to t e (volts) posit
ion. T e plate voltage meter s ould read approx
imately 1200 VDC.
4. Tune your exciter in t e Tune or CW mode as
stated in your exciter's manual.
5. Reduce CW output using t e carrier or CW
level control on your exciter. Unkey your ex
citer.
Before continuing, never keep t e LA-1000
keyed for longer t an 15 seconds at a time wit 
out allowing equal cool down time.

6. Preset t e LA-1000 meter switc to t e I (current)
position. Key your exciter and begin to increase t e CW
carrier level untill reac ing approximately 300 mA on t e
plate current. Quickly turn t e TUNE and LOAD control for
maximum output on your wattmeter. Contimue to Increase
your exciters output untill you reac approximately 600mA
(.6A X 1166v = 700 watt DC input).
7. Repeak your Tune and Load controls for maximum output.
To operate SSB, tune t e LA-1000 as stated above. W en
fully tuned in CW, simply c ange your exciter to SSB. No
furt er adjustments to t e LA-1000 are required.
THEORY OF OPERATION
Power Supply
After t e LA-1000 as been installed according to
t e instructions, and power is applied, SI is used for in
itial turn on. AC is applied to Tl, t e main power trans
former, and to t e fan, Bl. T e t ree secondary windings
of t e transformer are used to produce filiment voltage
(6.3v) relay control voltage (12v) and HV. T e I2v DC is
developed by use of a alf wave rectifier. W en power is
applied, meter lamp X2 and LED D1 (internal part of SI)
will lig t.
T e closing of S2 allows 12 v to be applied to t e
relays (RL2-6) in t e tuned input, t e QSK module, t e Xmi
lamp XI and t e LED D2 ( internal part of t e S2)
T e ig voltage section is made up of 8 diodes in
a bridge circut. Eac diode (D4-11) is a 3 amp lOOOpiv in
parallel wit a .01 uf capacitor (C23-30 for transient pro
tection, and a 470 Ko m h w resistor (R 3-10} for equal
ization. For filtering, 3 125 uf 0500 v capacitors ( 031-
are used in series. Eac as a 10GK o m 2w bleeder resis
tor (R15-17) in parallel.
RF Operation.
W en S2 is in t e OPT mode, 12 v is applied to t e
tuned input relays, t e QSK module and t e transmitter ligf
T e band switc w ill select a ground pat for one of t e
tuned input relays, allowing t e proper section to be plac<

in series wit t e RF pat . W en t e exciter is
keyed» it provides a closed circuit for t e trans
mitter lamp and t e QSK module. T e QSK module
in turn keys t e antenna relay RL-1.
RF from t e exciter flows into Jl, t roug
t e proper input circuit, t roug C12, 13 to
t e cat odes of tubes V1-V4. Diode D12 pro
vides bias for t e tubes.
PC 1-4 are parasitic c okes. T e RF comes
from t e tubes, t roug C35 to t e tank circuit
L6, 17, C36, C37. T e tank is tuned for max
imum transfer of RF to t e antenna t roug J3
RFC 3 is to protect t e antenna from DC poten
tial .
I INTERCONNECTION DIAGRAM
EXCI ER
RF
ACC Y OUT
wd c?) RG58-?
<-.«.A -l200>

UNPACKING
Carefully unpack t e LA-1000 and examine contents
for evidence of s ipping damage. If any damage is dis
covered, notify t e transportation company t at del
ivered t e equipment. Be sure to keep t e carton and
packing material as t e transportation company t at de
livered t e equipment will want to examine t em. Keep
t e carton and packing even if no s ipping damage occurs.
Having t e original carton available simplifies repack
ing t e equipment for storage or to return it to t e fac
tory for service.
Remove t e 12 screws olding t e top cover in place.
Remove t e packing material located over t e tubes and
under t e tuned input PC board. Install t e fuse supplied
w ic is attac ed to t e transformer indide t e amp. Re
place t e top cover wit t e vent oles near t e rear.
INSTALLATION
T e LA-1000 is factory wired to operate from 117VAC.
If 234 VAC is desired, you will ave to rewire t e power
transformer primary as s own below. T e terminal strip
is located in front of t e power transformer on t e c assi
1. Position t e LA-1000 so t e rear and t e bottom
of t e unit are clear of all obstructions. T is will
assure adequate air circulation.
2. Connect a wattmeter and a 50 o m load to t e RF
output connector using RG 8u or its equivalent.
3. Connect t e LA-1000 RLY connector to your exciter
using s ielded cable, (See interconnect diagram)
T e LA-1000 requires closed contacts for keying. Con
sult your exciter's owners manual for proper#connection
4. Connect t e LA-1000 RF IN connector ot t e excite
RF output using 50 o m coax.
5. Connect as s ort a ground lead as possible from
a good eart ground to t e LA-lOOO’s GND connector.