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TRIODE CONTROL
DS-1
DS-1 PS
HV-2
HV-MULTIPLIER
TU-6B
MISC PARTS FOR SALE
GALLERY INDEX
UPDATES
USEFUL LINKS
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WD7S TRIODE CONTROL BOARD

COMPLETE CONTROL AND PROTECTION

FOR HOMEBREW OR COMMERCIAL

 GROUNDED GRID LINEAR AMPLIFIERS

 

GROUNDED GRID TRIODE AMPLIFIERS REQUIRE SEVERAL FORMS OF PROTECTION TO KEEP THEIR TUBES AND OPERATORS SAFE.  THE WD7S TRIODE CONTROL BOARD CONTAINS FEATURES FOUND ONLY IN TOP OF THE LINE COMMERCIAL AMPLIFIERS.  THESE ADVANCED FEATURES ARE NOW AVAILABLE TO THOSE OF US THAT WISH TO HOMEBREW OUR OWN EQUIPMENT.  

THE FOLLOWING FEATURES ARE INCLUDED IN THE CONTROL BOARD AND ASSOCIATED CIRCUITRY;

    SUPPORTS HIGH VOLTAGE BIAS FOR GS-35B ON BOARD, REQUIRES CUTTING OF ONE TRACE TO ENABLE.                           

ADJUSTABLE WARM-UP TIMER; HOLDS OFF HV AND KEY LINES

ADJUSTABLE GRID OVER-CURRENT FAULT, AUTO-RESET

ADJUSTABLE GRID OVER-CURRENT WARNING LED

ADJUSTABLE PLATE OVER-CURRENT FAULT, SHUTS DOWN HV SUPPLY IN  8.3 MILLISECONDS OR LESS

STEP-START HV TURN ON, (SOFT-START)

TUNE/ARC FAULT, UN-KEYS AMPLIFIER WHEN SEVERELY MIS-TUNED OR DURING TANK CIRCUIT ARC, AUTO-RESET

HV PRESENCE FAULT, HOLDS OFF KEY LINE IF HV NOT PRESENT OR LOW AFTER WARM-UP

AIR FAULT, SHUTS DOWN FILAMENT SUPPLY IF AIR FLOW NOT PRESENT WITHIN 5 SECONDS AFTER POWER  APPLIED (AIR SWITCH NOT INCLUDED)

ON-BOARD FILAMENT PRIMARY  SSR, 5 AMP MAX, SSR INCLUDED IN KIT

FULL BREAK-IN QSK USING BUILDERS VACUUM RELAYS,  LESS THAN 2.1 MS

T/R FAULT, TRANSFER RELAY HOT SWITCHING PROTECTION

FULLY ADJUSTABLE OPERATING BIAS USING THE TL-431 ADJUSTABLE PRECISION REFERENCE

SOLID STATE BIAS SWITCHING, 2.5 AMP MAX, (CONTROLLED BY KEY LINE, NOT RF)

DUAL KEY-LINE BUFFERS, EITHER +5 TO +16 VDC OR GROUND WILL KEY THE AMPLIFIER, (TTL AND CMOS COMPATIBLE, NO NOISY RELAYS)

INSTRUCTIONS FOR COOL - DOWN DELAY FOR BLOWER, (OFF BOARD)

FRONT PANEL STATUS OF ALL FAULT AND OPERATING CONDITIONS, NO MORE  GUESSING WHICH FAULT TRIGGERED THAT SINGLE FAULT LED

ZERO CENTER TUNE METER, DETECTS INPUT AND OUTPUT POWER LEVELS AND DISPLAYS VARIATION FROM OPTIMUM GAIN 

LOW VOLTAGE REGULATED POWER SUPPLY ON BOARD, SAVES VALUABLE SPACE AND SIMPLIFIES INTERCONNECTIONS, TRANSFORMER INCLUDED IN KIT

SOLID STATE RELAYS USED FOR ALL AC SWITCHING, NO MORE WELDED CLOSED OR DIRTY RELAY CONTACTS, (HV AND HV STEP-START SSR's ARE OFF-BOARD AND USER SUPPLIED)

120 OR 240 VAC SUPPLY, PLEASE SPECIFY

COMPACT BOARD SIZE, 4 X 8 X 2.0 INCHES (WDH)

PARTS LIST AND COMPLETE INSTRUCTIONS INCLUDED

SINGLE SOURCE FOR ALL COMPONENTS (MOUSER), NO SHOPPING AROUND FOR HARD TO FIND PARTS

AVAILABLE AS COMPLETE KIT INCLUDING ALL ON-BOARD PARTS

KIT DOES NOT INCLUDE OFF-BOARD PARTS OR MOUNTING HARDWARE

ALL OF THE ABOVE FEATURES ARE ACCOMPLISHED WITHOUT THE USE OF RF SENSITIVE TTL OR CMOS  USING THE COMMON LM339 COMPARATOR AND ONLY A HANDFUL OF DISCRETE DEVICES.  ALL IC'S ARE IN SOCKETS TO MAKE REPLACEMENT AND TROUBLE SHOOTING EASY IF EVER REQUIRED.

ALTHOUGH HIGH SWR PROTECTION IS NOT INCLUDED, THE SOFT FAULT LINE IS BROUGHT OUT TO THE BOARD CONNECTERS FOR INTERFACING TO ANY NUMBER OF OUT-BOARD PROTECTION DEVICES INCLUDING THE DS-1 BARGRAPH DISPLAY MODULE 

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      CREATED AND MAINTAINED BY PAUL HEWITT, WD7S
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APRIL 2 2012