WD7S PRODUCTIONS

HOMEBREW GALLERY-4

YC-156 SIX-METER DESKTOP

[INDEX]   [GALLERY-1]   [GALLERY-2]   [GALLERY-3]  [GALLERY-5]  [GALLERY-6]  [GALLERY-7]

CLICK ON IMAGES FOR FULL SIZE VIEW

 

FRONT VIEW OF TANK COMPARTMENT
NOTE ADJUSTABLE TAP POINT

TOP VIEW OF COMPLETED TANK
WITH AIR CHIMNEY IN PLACE


UNDERSIDE VIEW OF CATHODE COMPARTMENT
AMPLIFIER USES PRESSURIZED ANODE AND CATHODE 
COMPARTMENT WITH AIR SUPPLIED AT CATHODE 


FRONT CORNER VIEW AFTER 
INTERCONNECTIONS COMPLETED  

 

SIDE VIEW OF REAR PANEL SHOWING TRANSFER RELAY 
AND DIRECTIONAL COUPLER ENCLOSURES 
FILAMENT RHEOSTAT MISSING

SIDE VIEW WITH INTERCONNECTIONS COMPLETED

 



FRONT VIEW

 

SPECIFICATIONS AND SOME EARLY NUMBERS 02-27-02

PLATE VOLTAGE, NO LOAD, 4450VDC
PLATE VOLTAGE @ZSAC, 4100VDC
PLATE VOLTAGE AT 66DBM OUTPUT 3600VDC
CAPACITOR BANK, 47UF, (10 X 470UF)
ZSAC, 400MA, BIAS VOLTAGE 17 VDC
DESIGN LOAD IMPEDANCE, 1350 OHMS
DESIGN FREQUENCY, 50-50.2MHZ
TANK CIRCUIT, PI-L
LOADED Q, 23, (RL/XC, OLD WAY)
LOADED Q, 36, (OVERALL)
INPUT T NETWORK Q, 5
INPUT IMPEDANCE RANGES FROM 33 OHMS AT 62DBM OUTPUT TO 22 OHMS AT 66DBM OUTPUT
AS MEASURED BY SUBSTITUTION OF REAL PART AT TUBE WHILE COLD

DRIVE +47DBM, OUTPUT +62.04DBM, GAIN +15.04DBM, EFFICIENCY 36.8%
DRIVE +50DBM, OUTPUT +64.77DBM, GAIN +14.77DBM, EFFICIENCY 55%
DRIVE +51DBM, OUTPUT +65.44DBM, GAIN +14.44DBM, EFFICIENCY 63%
DRIVE +52DBM, OUTPUT +66.28DBM, GAIN +14.28DBM, EFFICIENCY 65%, (DESIGN RL FOR MATCHING)

FEED-THROUGH POWER NOT ACCOUNTED FOR
DRIVE USED, 30WPM DIT STRING
WATTMETER, NYE VIKING RFM-005 PEAK MODE
DUMMY LOAD, BIRD 2500 WATT WATER COOLED, (USED SPARINGLY) 

HARMONICS AND SPURS >53DBM BELOW FUNDAMENTAL, DOES NOT MEET FCC SPECS FOR THIS FREQUENCY
WITHOUT BAND PASS OR LOW PASS FILTER

THE TUNE CAPACITOR WAS INCLUDED FOR POSSIBLE EXPERIMENTATION AND IS NOT USED OR REQUIRED
THIS TUBE DOES NOT DRAW GRID CURRENT BELOW 50DBM OF DRIVE AND ONLY 44MA AT 52DBM DRIVE, (DESIGN RL)
NO THERMAL DRIFT OR COMPONENT HEATING WAS OBSERVED AT THE 66DBM OUTPUT LEVEL

THE AMPLIFIER USES THE FOLLOWING BOARDS
TRIODE CONTROL, DS-1, DS-PS, HV-2, AND A NEW 5KW DIRECTIONAL COUPLER, DC-1

 MORE TO COME, STAY TUNED!

 

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JUNE 3, 2015