SILTRONIX LA-600 Operating & Service Manual Download

Page: 14 / 17

Tubes

Ref#

Description

NOTES:

8950

Driver Section

8950

PA Section

8950

PA Section

8950

PA Section

8950

PA Section

Switches, Fuses, Relays, Lamp, Misc

Ref#

Description

NOTES:

15 Amp

SPST

AC POWER Switch

SPDT

MODE Switch

DPST

RF POWER Switch

SPDT

DELAY Switch

DPST

PREAMP Switch

3PDT

DPDT

Potter Brumfield, 12V, KT11D

DPDT

AZ531-09-1

LAMP

# 1815

14V 200Ma, 2.8 Watts, T3.25

SCREW

Top Cover, 8-32 x 1/4” Binder Head

6 each

SCREW

Bottom Cover,

6 each

Inductors, RFC, Transformer

Ref#

Description

NOTES:

4 uH

Filament Choke

17 uH

Driver Plate HV Choke

55 uH

Driver Plate HV Choke

55 uH

PA Cathode Choke

Wire Coil

Driver Section, Pi Network

17 uH

PA Plate HV Choke

55 uH

PA Plate HV Choke

Wire Coil

PA Section, Pi Network

30 uH

PA Section, Mounted under C49

L10

Preamp Tuning Coil

On PCB, Tunes Preamp Input

L11

GRID TUNING Coil

Access on back of chassis

RFC 1

47 2W with 4 Turns Metal Strip

Driver Section

RFC 2

100 2W with 5 Turns 14ga Wire

PA Section

RFC 3

100 2W with 5 Turns 14ga Wire

PA Section

RFC 4

100 2W with 5 Turns 14ga Wire

PA Section

RFC 5

100 2W with 5 Turns 14ga Wire

PA Section

Power Transformer

271-025

Summary of Contents for LA-600

Page 1: ...ODEL LA 600 RF Amplifier OPERATING SERVICE MANUAL SILTRONIX 330 VIA EL CENTRO OCEANSIDE CALIFORNIA 92054 Original manual print date unknown Copyright 2007 Donald W Thomas K5ZRQ Artwork and Diagrams by Bennie Bolin ...

Page 2: ...ears of trouble free service It is important however the Operating Instructions should be followed The RF drive requirements to the amplifier should not be exceeded Once the unit has been installed and tuned for proper operation retuning of the amplifier should not be required Even though the rugged 8950 s should provide years of trouble free operation the most severe conditions for the tubes exis...

Page 3: ... modulation is present In AM position the AM carrier of the transmitter keeps the amplifier in the Transmit mode as long as the transmitter is keyed PI Output Circuit Matches 52 to 75 ohm load and other impedances where the SWR does not exceed 2 5 1 Pre Amplifier Provides approximately 6 db gain for received signals Power Supply Computer grade electrolytic capacitors and conservatively rated silic...

Page 4: ...of the exciter or measure the power output with a wattmeter 3 Connect a short length of coaxial cable RG 58 or RG 8 from the exciter transceiver or transmitter to the INPUT jack on the rear of the LA 600 A PL 259 connector is required to connect the coax cable to the amplifier Coax cable should be as short as possible 4 Connect antenna or suitable high power dummy load to the OUTPUT connector on t...

Page 5: ...nput 4 DELAY SSB Position Allows the relay to remain in Transmit mode during short pauses while transmitting AM Position Continuously keeps the LA 600 in the transmit mode so long as the exciter is in transmit 5 PRE AMP OFF Position Exciter receives signal directly from antenna ON Position Exciter receives signal from PRE AMP which provides approximately 6 db gain The PRE AMP switch operates indep...

Page 6: ...ustment to be made to the exciter before operating the LA 600 Use this setting for checking drive power 2 Initial tune up should be accomplished with the exciter transceiver set at the middle range of the frequencies to be operated This allows operation over the entire range without re tuning the amplifier 3 The tune up procedure should initially be accomplished by applying the exciter driving pow...

Page 7: ...just PLATE control for maximum meter reading There should be a definite maximum meter reading and as the PLATE control is moved in either direction the reading should decrease 8 Quickly adjust the LOAD control for maximum meter reading 9 Steps 7 and 8 should be repeated several times until no greater reading can be obtained Do this as rapidly as possible 10 Now switch RF POWER switch to HIGH and r...

Page 8: ...iver output and is accessed thru a small hole in the side of the top cover The four PA Tubes are just above the driver section You can see the Plate Cap connections with their Plate Parasitic Suppressors Above them you will find the Plate Load and Plate Tune capacitors used for tuning the finals for proper operation In the bottom center K1 is the main relay for switching the PA in and out of line ...

Page 9: ...e LA 600 as indicated by the labeling Figure 6 1 PCB The wire connections to the PCB are as listed below 1 Wire from PCB to relay K2 NO contact 2 Connects to RF Input Jack 3 Connects to Delay switch SSB contact 4 Connects one end of R42 the other end of R42 is connected to the RF Output Jack 5 Connects to the front panel meter 6 Connects to Preamp switch 7 Connects to Preamp switch 8 Connects to t...

Page 10: ...nimum reading on the RF Voltmeter or Oscilloscope The amplifier is now neutralized 2 Bias Driver A Connect a DC Voltmeter to Pin 2 of the driver tube the cathode B Turn linear amplifier on set to high power position C Adjust bias pot one closest to power supply for a 5 VDC reading on Pin 2 3 Bias Power Amp A Connect DC Voltmeter across the one ohm 10 watt resistor in the cathode of the power amp B...

Page 11: ...pF Mylar Driver Section C21 100uF 250VDC Electrolytic HV Section Bottom chassis term strip C22 002uF Ceramic Disc Driver socket pin 11 C23 002uF Ceramic Disc Driver socket pin 3 C24 002uF Ceramic Disc Driver socket pin 2 C25 3 3pF 3KV Ceramic Disc Driver Section C26 3 3pF 3KV Ceramic Disc Driver Section C27 002uF 2KV Ceramic Disc Driver Section C28 002uF 2KV Ceramic Disc Driver Section C29 270pF 2...

Page 12: ...n R4 470K 1W HV Section R5 39K 6W DALE FP33 6W HV Section R6 39K 6W DALE FP33 6W HV Section R7 39K 6W DALE FP33 6W HV Section R8 39K 6W DALE FP33 6W HV Section R9 1K 1W Bias Power Supply R10 4 7K 1W VR1 and term strip R11 4 7K 1W Across VR1 R12 6 8K 1W Tied to VR1 R13 10K 1 2W Driver Section Bottom chassis term strip R14 12K 10W HV Section Bottom chassis term strip R15 10K 10W HV Section Bottom ch...

Page 13: ...rminal Strip Potentiometers Ref Description NOTES VR1 5K Bottom Chassis VR2 25K Bottom Chassis VR3 10K On PCB Diodes Ref Description NOTES D1 1N4822 HV Section D2 1N4822 HV Section D3 1N4822 HV Section D4 1N4822 HV Section D5 1N4005 Bias Power Supply On Terminal Strip D6 1N4005 LV Power Supply On Terminal Strip D7 1N914 On PCB Keying detector D8 1N4005 Across K1 D9 1N914 On PCB D10 1N4005 On PCB A...

Page 14: ...er 6 each Inductors RFC Transformer Ref Description NOTES L1 4 uH Filament Choke L2 17 uH Driver Plate HV Choke L3 55 uH Driver Plate HV Choke L4 55 uH PA Cathode Choke L5 Wire Coil Driver Section Pi Network L6 17 uH PA Plate HV Choke L7 55 uH PA Plate HV Choke L8 Wire Coil PA Section Pi Network L9 30 uH PA Section Mounted under C49 L10 Preamp Tuning Coil On PCB Tunes Preamp Input L11 GRID TUNING ...

Page 15: ...r stage must be re aligned and re neutralized because the internal capacitances of the two different tube types are not the same Also when using the 10 lead transformer the two primary windings must be wired in parallel For the 110V AC source the 2 windings are 1 orange and brown and 2 yellow and green To wire them in the proper phase the orange and yellow leads are both connected to the unswitche...

Page 16: ...sembly Put brass roller back into the housing and push it to the end with the side contacts Put the three piece part back in with the grooved guide end riding on the middle of the brass roller Place the two insulators back on the sides of the housing Move toggle on top cover to the side labeled ON While holding the housing and insulators together slide the top cover down over the housing The botto...

Page 17: ...vered under the warranty policy for a period of 90 days This warranty is valid only if the enclosed card is properly filled out and mailed to the factory within ten days of purchase Do not ship equipment to the factory without prior authorization This warranty is limited to repairing or replacing only the defective parts and is not valid if the equipment has been tampered with misused or damaged A...

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