Amp Supply LK 500, LK 400 Service manual
AMP SUPPLY CO.
LK 400/ 500 SER IES
LIN EAR AMP LIFIE RS
OWNER'S MANUAL
A mp Supply Co.
63 0 7 Cha p e l Hill Rd.
Raleigh , NC 276 0 7
T ab l e o f Content s
Sec ti on
1.0
1.1
1.2
1.2.1
1.2.2
1.3
1.4
2.0
2.1
2.2
2.3
2.4
2.4.1
2.5
2.6
2.7
2.8
2.9
2.1 0
Tit le
Page
Int r o du ct ion
Produ ct Descr iption
S peci f i c at i o ns
Comm on Spec ifica tio ns
Unique Sp ecif ic ati on s 4
Front Panel Features
Rear Apron Features
Ins t al l ati on
Int r o du ct i o n
Unpacking
Warranty Card
Ins t al l ati on
Tube Ins tal latio n
Amp li fie r P la ce m e nt
Power Requireme nts
A mp l if i e r In s ta l la t io n
Cable Ins tal latio n
Ground Requirements
Ante nna Requirements
1 0
1 0
1 0
1 2
13
1 3
1 5
1
1
2
2
6
7
9
9
9
9
9
3.0
3.1
4.0
4.1
4.2
4.3
4.4
Tuning
Tuning Procedure
Am p li fi er Care
Int r o du ct i o n
Cleanin g Ampl ifie r Compart me nt
Tube Replacement
Tr o u b le s h o o ti n g
4.5 Factory Servic e
Limited Warranty
Appendix A
Appendix B
Warnings and Cautions
Schem atic Diagrams
1 6
1 6
2 0
2 0
2 0
20
2 2
2 2
2 6
A -1
B-1
List of Fi g ure s
Figure
Titl e
Page
2.6.1 AC Line Hook-Up 1 1
2.6.2
2.8.1
B-1
Ju m pe r Plug Pla cement
1 2
LK 400/500 Cable Installation 14
ALO / Me ter Board — LK500 Series B 2
B- 2 ATI-6 Input Network Board B 4
B- 3
B-4
Meter Board — LK450
Power Distributio n Board
B -5 Power Supply
B 6
B Q
B12
B- 6 QSK Board B10
B- 7 LK 450 Schematic
B- 8
LK 500 Schematic B15
B14
B- 9 LK 550 Schematic B16
B-1 0
B-1 1
LK 450 No Tune Up RF Circuit B17
LK 500 No Tune Up RF Circuit B18
B-1 2 LK 550 No Tune Up RF Circuit B19
Lis t of Ta bles
Table Tit le
3' 1 Tuning Charts
Page
1 8
4 ' 1 MARS Expanded Frequency Chart 21
4 ■ 2 Trou ble sho ot ing Char t 2 3
Fi rst P r int i n g August 1987
Fi r st Re vis ion February 1988
iii
SE CTION 1
INT ROD UCT I ON
1.1 Product Description
The Amp Sup ply LK 400 / 500 series l i near p ow er amplifiers a re co mpact 16 0-15
meter MF/H F amplifi ers of moder n des i gn. The series provides the amateur o perat or
with a ch oic e of pow er output l e vels a n d f eat ure s consist ent w i th t heir s pecif ic op erat
ing req uire ments. Each LK 400/500 series ampl i fier uses t he power f ul 3-500Z triode
tube(s) in a grou nded grid c onf i guratio n C l ass A B2. The LK 400/500 se r ies amplifi e rs
are high performan ce p ieces of equipment an d are engineered conservat i vel y with
Am eric an comp onents and in genu i ty.
Every LK 4 00/ 500 seri es MF/HF linear amp l ifier is fi e l d t ested at its spe c if ied
po wer input level and du t y cycle an d s hould require a mini mum of maint enan ce
thro ugh yea rs of oper ation . Add i t iona ll y, each LK 400/500 series amp l ifier will op e rate
many MARS f r equ encies with out mo d i f i catio n (se e M ARS expande d c ove r age c hart).
A qu iet, efficient co olin g syste m mai ntai ns the RF dec k a nd power s uppl y chamber
temp era t ure ensurin g long se r vice life. All LK 500 series linear am plifiers featu re the
new ALO ( Autom atic Lock Ou t ) circuit which sen ses una cce pta ble pl ate/g rid currents
and voltages or impro per a mplif i er tun i ng a nd stops a mplif i er o peratio n.
Tuning the amplifier is a simple proc edur e, sinc e e ach unit is desig ned for lo n g
term s t abil i t y in virtually any o perating situation . Tuned inpu t an d standard relay
swit ching ci r cuitr y makes the LK 400/500 s e ries comp atible wit h any available solid
stat e or tube transceiv er or transmitter. De s pite t heir straight-fo r wa rd de sign and
minima l use r r equir ed ad j ustment, t he LK 400/5 00 serie s linea r am plif iers are soph i s
tic ate d ele ctronic ins truments . T herefore, if the u nit is opera ted outside the par am e
ters outlined in this owner’s ma n u al, d am age m a y result. Ple a se read t his ma n u a l
carefully b efore putt in g yo ur ne w Amp Su pply LK 400 / 500 series linea r ampl i fier on
the air.
1
The follow ing def i nitions ar e app l i cabl e to this manua l. These definitions must be
followed explicitly . See Appe ndix A for a complete list o f caut ion s and warnings.
WAR N ING
HAZA R D P R ESE N TS P ERS ONAL INJU R Y OR D E A T H
CAUTIO N
EQUIPME NT DAMAGE MAY OC CU R BUT NOT PER SO NAL INJURY
NOTE
Proper p erforma nce of the amp l i f i er can not be ens ured if disregard ed
1.2 Specifications
The fo ll owing subs ect i ons d esc ribe the LK 400/500 series amplifiers specif ica
tions.
1.2.1 Common Specifications
Physical di me nsions an d fun ctional ch aracteris tics o f t he LK 400/500 serie s
amp l i fi ers are contained in t his listing. Specif i cat i ons ar e subjec t to cha nge withou t
notice o r oblig a tion.
DIMEN SIONS: 9" H x 15M W x 15" D
FREQUENCY COVER AGE: Ham Bands 160 throu gh 15 meters*.
Non-amat eur fre quenc i es betw e en 1.8- 4.0 and
6.5- 24 MHz may be cov ere d by a dju stment made
by a q uali f i ed e l ectronics t ech nici an.
CIRC UIT TYPE:
EMISSIO N TY PES :
INPUT IMP EDANCE:
Class AB 2 gr ounded gr id.
RTTY, SS TV, AM, CW, SSB
50 Oh ms - tune d in p ut for eac h band
2
TU BE C OMP LEM ENT :
(1) 3 -500Z Tr i o de
TYPICAL O UTPUT:
PLATE VOLTAGE:
DRIVE REQ UIRE MENTS
FOR T YPICAL OUTP U T:
DUTY CYCLE :
POWER REQ UIRE MENT S:
WEIG HT:
LK5QQ Se ries
TUBE COMPL EM ENT:
1000 W atts SSB, 800 Watts CW, 60 0 Watts
SST V , RTTY a nd 300 Watts AM
RTTY, SSTV, AM, C W, SSB, 3.2 KV DC no
load
85 Watts PEP S SB 80 W atts C W. 5 0 Wat ts
SSTV RTTY
Ama teur continuou s d uty on all m odes at
sp ecified out put
117 Vo l ts 50/ 60 Hz @ 2 0 Amps or 234 V olts
50/ 60 Hz @ 10 Amps, unit fa ctor y wi r ed
for 117V
Shi ppin g Net 46 lbs ; o per ating n et 41 lb s
Ship ped in two bo xes
(2) 3 - 500Z Triode s
TY PIC AL OUTPUT:
PLATE VOLT AGE :
DRIVE REQ UIRE MENTS
FOR T YPICAL OUT PUT:
DUTY CYC LE:
1500 W att s PEP on SS B, 1200 Watts on CW
90 0 Wat t s on SSTV , RTTY a n d 6 00 Watt s A M
RTT Y , SSTV A M . CW, SSB 3.2 KV DC no load
100 Wat t s P E P SSB 100 Wa t t s CW .
60 Watts SS TV. RTTY
Ama teur c ont i nuous duty in all mod es at
sp ecified output.
4
POWER REQU IR EM ENT:
117 Volts 50/ 60 2 5 A mps or 234 Volts 50/ 60
Hz 12.5 Amps
WEIG HT:
AU TOM ATIC L OCK OUT :
POWER T RANSFOR MER:
LK55Q Series
TU BE C OM PLE MENT:
TY PIC AL O U TPUT:
PLATE VOLTAGE:
DRIVE REQUIREMEN TS
FOR T YPIC AL OUTPUT:
Sh i pping net 59 lbs, 2 b ox es; op era ting n et 54
lbs
Safe ly int err up ts ampli fie r ope rati on when
unacceptable an tenna cu rre nts and/or
voltag es are en count ered, or when the
ampli fier is improperly tuned
1.2 Amp ICA S Pe ter Dahl H yper s i l.
(3) 3-500Z tr i odes
1500 Wa tts SS B, CW, SSTV, R T TY, 900 Watts
AM
RTTY, SSTV, A M, C W , SSB 3.2 KV DC no
lo ad
100 Wat ts all modes
DUTY C YCLE:
POWER REQUIREMENTS :
WEIGH T:
AU TOM ATIC LO C K O U T :
POWE R TRA NSFORMER:
Continuous du ty all mo des at spec i f i ed output,
24 hours a day
234 Volts 50/60 Hz 25 Amps only
Sh i pping Net 11 0 lb s ; 3 boxe s Opera t i ng Ne t
103 lbs ; RF Dec k 3 8 lbs; transf or mer 65 lbs;
tubes 7 lbs.
Safe ly in ter r up t s amplif ier o perat ion wh en
unacceptable ante nn a cu rre nts and/or
voltages are en count ered, or when the
amp l ifier is imprope rly tuned.
1.75 Amp CCS Pet er Dahl Hy per sil in
separa te enclosur e.
5
1.3 Fro nt Panel Featu re s
AC-ON Ill umi nated ROC KE R SW ITCH - Tur ns po wer on and off.
XMIT-S TBY RO CK ER SWITCH - Tu rns th e amp from St an dby to Oper ate
mode. Operate mode en ables a green LED.
BAND-SW I TC H - Sel ects desired band.
HI/L O AIR SWITCH - Provides high er vo l ume c ool i ng air for ex t ended
ope r ation .
XMIT- Red LED
PLATE AND LOAD KNOBS - Tuning ad j usts Pi- Network capa citors in ta nk
circuit for p roper resonance and load i ng on all bands .
PLATE CU RRE NT METER - C ontinuous l y monito r s pla te curre nt o f 3-5 00 Z
tube(s).
GRID-VOLT M ETER - B y u s e of the meter s witch can mo nitor plate volts
(0-3 5 00 V) or grid curren t (0 - 350 mA).
AL O LED - Ena bled when unacceptable plat e/grid c urr ents a nd /or vo l tages
are encou nte red or imp rope r amp lifier tuni ng exists .
6
1.4 Rea r Apron Features
RF-IN - F or connecting to ex citer RF output to the ampl i f i er.
RF -OUT - For connect i ng the LK 400/5 00 ser i es linear amplifie r t o an antenna.
RLY - For connecti ng to excit er aux i l i ary jac k to act i vat e T / R Rel a y in t he LK400 / 500
series a mpli f i e r s.
KEY IN - QSK O NL Y - s tation key, mus t be a bug, h and key or a keye r
KEY OU T - Q SK ONLY - ho oks to th e KEY-IN j ack on a QS K transceiv er.
QS K VOX SWIT CH - place in t he QS K posit ion when op era ting QS K CW.
GRO UN D LUG - Att ach to a good earth ground.
FU SES - 2 holders provid ed to pro t ect each leg of th e AC line.
SERI AL NU MBER - Located on the mo del ty pe ide ntif i cat i on sticker.
AC LINE CO RD - Connect to proper pow er requir ements only.
PAC-5 PLUG - LK5 50/LK500 w/optional PAC-5 o nly. Conn ec ts t he PAC-5 pow er
transformer to LK 550 / LK500 .
7
CAUT IO N
NE VER RE MOVE /INS ERT PLUG W HEN UN I T IS O N OR WHEN THE RF
DECK AC LINE CORD IS CONNECTE D TO AN AC PO WER SO URCE
8
SECTION 2
INSTALLATION
2.1 In t r o ductio n
Thi s s ectio n describes the unpacking an d installati on procedures fo r the LK 40 0/
500 ser ies amplifi e r s.
WARNING
MAKE NO ATTEMPT TO PUT THE AMPLIFIER IN SERVICE
OUTSIDE OF THE CABINET—CONTACT WITH VOLTAGE
INTH E AMPLIFIER CAN BE FAT AL!!!
2.2 Unpa c k in g
All shipping contain ers have been speciall y designed to prote ct t he i r cont ents
and sp ecia l c are has be e n take n to pre ven t damage u nder no r mal shipping con d i ti ons.
Mis handling sho uld be evid ent upon inspect i on of the ship ping conta i ner. If dama ge is
foun d a fter vis ual inspection, take c are not to dest r oy t he evid ence. If neces s a r y ,
do cumen t th e da mage wi th pho t ograp hs and c ont act the trans port carrier imm e diately.
Ca r efu l l y re move your new LK4 00/500 s eries linear amp l i fier fro m its pa c kin g
car ton, a nd examin e it cl osel y f or sign s of shippin g damage. It is r ecom me nded to
save all original packing c artons to prot ect y our ampli fier f r o m damage shoul d yo u
wis h to store it or ship it fo r after-sales ser v ic e.
2. 3 W arran t y Card
Fill out the e nclose d war ran ty regis t r ation card a nd return to Amp Suppl y within
10 days of orig i nal purc h ase . Ke e p your origi n al sale s slip with the packing carto ns
sho u l d y o u ever ne e d it for referen c e .
2.4 Inst a ll a tion
The following sub sectio ns de scr i be the i nsta l l ation procedures for t he LK 40 0 /5 0 0
series a mplifi e r s .
9
2.4.1 T u b e Installation
CAUTION
EN SUR E TUB ES ARE INST ALLED PRIOR TO
APPLYI NG POWE R TO THE AMPLIFIER
Carefully remove the tub es fro m their box es. Carefully move th e parasi t ic
cho k es in the tube com par tment ou t o f t he way and in s tall tub es. When secur i ng the
plate c a p(s), take care not to over tighten screws or tube(s) ma y be damaged. R e move
packing from und er the tune d in p ut board .
2.5 Amplifie r Placement
In genera l , the locat io n of your n ew ampli f i er is not cr i t i c al. Howe ver, certai n
prec aution s mu s t be taken to ens u r e opt i mum perf orman ce. Avo i d ext remely hot
locatio n s such as near r adia t ors or oth er heati n g units. K e ep t he top of the ampli f i er
cas e c l ear o f b o o k s , papers, o r ot her equ i pment to pro t ect against o ver heating. Do not
place the amplif iers cl oser th a n 2-1/ 2 in c hes from a wall.
CAUTION
OBS TRUC TIO N OF TH E SIDES O F THE AMP LIFIER C A SE
AN D THE BLOW ER AIR INL ET MAY RE SULT IN
AMP LIFIER TUBE(S ) OV ER HE AT I NG
2.6 Power Requirements
Ref er to your amplifi er series un ique sp ecifi cati ons f or proper powe r requ i re
ments and Figu re 2.6.1 fo r AC line hook-up.
WARNING
NEVER OPERATE ANY AMPLIFIER
USING AN EXTENSION CORD
The LK400/ 500 series is s h i pped from th e fac tory with jumpers con nec t ed to op erate
on 234 VA C (e x c ept LK 4 5 0) . It is hig h ly recommen ded that your
1 0
QSK ON L Y T R A N S CE IVE R
FIGURE 2.6.1 AC Lin e Ho o k - U p
11
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