Alpha 89

Alpha 89

Alpha 89 Fuses – Purchase on our web store by part number:

Micro Fuse, 2 Amp 125V, Part Number FSX-X123
Used on the  89 T/R board (PIN Diode circuit)

Micro Fuse, 1.5 Amp 125V, Part Number FSX-X136
Alpha 89

Documentation

89 User manual Alpha_89_Operating_Manual
89 Tuneup Alpha 89 tuneup
89 Schematic 89_full_schematics
89 Parts list PARTS_LIST_-_ALPHA_89
89 PIN Diode Modification Alpha 89 PIN Diode Mod
Alpha Amplifier Production Dates Alpha_Amplifier_Production_Dates
Alpha Amplifier Keying Specs Amp_Keying_Specs

2 Replies to “Alpha 89”

    • Glenn Pladsen

      If R27 thru R30 are each a pair of tan carbon-film resistors they can fail internally and start arcing, they aren’t rated for the voltage on them. The resistor change across the diodes changes the bias voltage on the receive PIN diodes.

      Reply

Leave a Reply

Your email address will not be published. Required fields are marked *