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Manual abstract: user guide HARBACH ELECTRONICS RM-220
Detailed instructions for use are in the User's Guide.
[. . . ] Lift the case up and remove it from the amplifier. Place the amplifier on the bench with the front panel facing you. You are now ready to proceed with the installation. [. . . ] Unsolder and remove all wires from the board. Cut or unsolder the leads going to the zener bias diode. T his is mounted behind and to the left of th e old rectifier board. It is advisable to remove the old zener diode to eliminate possible HV arcing due to dangling leads and dust.
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NOTE: All holes noted in the following steps are m arked on the solder side of the new circuit board, and are in a similar location as those on the original rectifier board. () Connect the RED wire coming from the high voltage transformer to hole "D" on the new circuit board and s older.
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Connect the HEAVY BLUE wire coming from the high voltage feed-through insulator on the left to hole "J" and s older. Connect the BLUE wire coming from the bottom of the capacitor bank (the + wire) to hole "H" and s older. Connect the BLACK wire coming through the grommeted hole in the chassis (from the relay contact) to hole "E" and s older. Connect the ORANGE wire coming from the meter switch to hole "G" and s older. Connect the YELLOW wire coming from the meter switch to hole "F" and s older. Connect the BLACK wire coming from the plate meter to hole "C" and s older. Connect the RED wire coming from the plate meter to hole "A" and s older. Connect the BLACK wire coming from the top of the capacitor bank (B- w ire) to hole "B" and s older. Connect the bare wire of the 0. 001µF 6KV capacitor to hole "K" and s older. Carefu lly inspect all solder joints to be sure that both the joint is good and that there are no solder bridges which could short components together. There are very high voltages on this board. Attach the RM-220 circuit board to the tapped spacers using the previously saved (4) 6-32 x ¼" screws. Place the front panel back in place and loosely put in the 2 Phillips-head screws on the left side of the front panel. Loosely reinstall the nut and washer holding the band switch to the front panel. [. . . ] 2
W hen you operate your linear am plifier, you will probably find that the plate voltage reading is much higher than before. The voltage is the same as before, but you are now reading the true voltage. You may notice a slight reduction in the idling plate current of your SB-220. [. . . ]
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