WD7S PRODUCTIONS
GALLERY-6
DUAL 8877 AUTO-TUNE HF AMPLIFIER
[INDEX] [GALLERY-1] [GALLERY-2] [GALLERY-3] [GALLERY-4] [GALLERY-5]
I'M STILL IN THE EARLY STAGES OF THIS ONE OFF CUSTOM. IT IS BASICALLY THE SAME AS THE SINGLE TUBE AUTO-TUNE IN GALLERY 5 WITH SEVERAL EXCEPTIONS. THIS AMP WILL USE A NEW TUNED INPUT BOARD CAPABLE OF 100 WATTS RTTY OR 200 WATTS ++ SSB. IT ALSO USES A NEW TRANSFER RELAY/DIRECTIONAL COUPLER BOARD. THIS BOARD USES A SINGLE VACUUM RELAY FOR OUTPUT TRANSFER AND A SMALL AROMAT RSD-12V REED RELAY FOR INPUT TRANSFER. THIS IS THE SAME RELAY RICH MEASURES SELLS/RECOMMENDS FOR HIS QSK CIRCUITRY. THE RELAY IS VERY FAST AND OSCILLOSCOPE TIMING DISPLAYS CAN BE SEEN HERE.
TANK CIRCUIT COMPONENTS, HV RECTIFIER STACK AND THE BLOWER HAVE ALL BEEN BEEFED UP FOR THE ADDED POWER. THE CONTROLLER BOARD INCORPORATES THE NEWER RF PREAMP AND A FEW OTHER TWEAKS.
THIS CABINET MEASURES 18W X 22D X 8H. THE OUTBOARD TRANSFORMER CABINET HOLDS THE 64 POUND PETER DAHL PLATE TRANSFORMER, 3000VAC @ 1.5A CCS
TEARDOWN AND PAINTING IS FINISHED. THE DOTS ARE ALL CONNECTED AND ALL LOW VOLTAGE AND CONTROL TESTING IS COMPLETE. RF TESTING AND FINAL CALIBRATION IS NEXT
STAY TUNED, MORE TO COME
