WD7S PRODUCTIONS

GALLERY-6

DUAL 8877 AUTO-TUNE HF AMPLIFIER

[INDEX]  [GALLERY-1]  [GALLERY-2]  [GALLERY-3]  [GALLERY-4]  [GALLERY-5]  

 

 

 THIS 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

 

 

YES THE TANK COIL IS GOLD PLATED, THANKS TO DAVE MONETTE FOR THIS FAVOR.

 

 

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APRIL 2 2012