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30L-1 Diode/Capacitor Board
January 2010: The W6BN 30L-1 Diode/Capacitor Board has been discontinued.
This is the latest in a series of after market diode/capacitor boards designed for the popular Collins 30L-1 amplifier. Designed by a professional power supply engineer this one-piece diode/cap board replaces the two piece assembly provided as original equipment some forty plus years ago.
The components include a high temperature 130-degree C FR4 fiberglass circuit board. The 85-degree C capacitors are mounted on the opposite side of the board from the bleeder resistors, which are surrounded by ventilating holes to insure maximum cooling. The rectifier diodes are 1N5408 3-amp units. The high voltage multiplier resistor consists of four separate resistors rated at three watts each.
The original Collins cap board had a total of 16mf of filtering, the new combination board increases this figure to 25mf for improved dynamic voltage regulation.
We have conducted a number of side by side comparisons and tests and present the results for your inspection (preliminary, subject
to change).
TEST ORIGINAL BOARDS NEW BOARD
Input Voltage To Amp. 120 VAC 120 VAC
Resting high voltage 1980 Volts DC 1980 Volts DC
Voltage at 300ma load 1820 Volts DC 1820 Volts DC
Ripple at no load 6 Volts P.to P. 2 Volts P. to P.
Ripple at 150 ma load 84 Volts peak to peak 50 Volts peak to peak
Diode string rating 4.8 KV 6 KV
Diode string current rating 600ma 3 amps
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Top view
Bottom view
Edge view
Original 30L1 capacitor board
Original 30L1 capacitor board (side view)
Bill installing one of his boards in a 30L1
Board installed in 30L1 (still to be wired in)
30L-1 Board pricing information
$99 plus shipping. How to order
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