New Member

Hi! I’m a new member from San Diego County, long time audio and electronics hobbyist. I collect and repair antique radios and vintage electronics for my own use.
Recently my estate sale purchased Threshold FET Two Series Two stopped working. I’m looking for a schematic and/or service manual copy to help me in figuring out why it powers up relay clicks but no output.
Any help would be much appreciated. Thanks in advance l!