The Guild 50-J amplifier seems to be a rarity, eved in these hallowed pages. Rare tube/valve configuration and one example is up on E-bay. Seems like an Ampeg in drag. The description is as follows.
"It has the original transformers, three inputs; Guitar, Accordion, and Microphone, and the controls are Volume, Tone, Tremolo Speed, and Intensity. The tube line up is; 1 6AU6A preamp tube, 2 12AX7 preamp tubes, 2 6AQ5A power tubes, and a 5Y3GT rectifier tube. I am told replacement tubes are readily available. The 12" 1960 Jensen Concert speaker sounds beautiful! The tweed covering is in fair cosmetic condition except for some stains and fraying on the corners which add character. As far as tone, to put it simply, this amp sounds stunning. A vintage amp guru who writes amp reviews for a well known gear magazine wanted to buy this amp from me to use in the studio when he heard it. The tone control works in reverse like a cut except it's interactive with the volume and adds gain! This amp could handle a small sized gig (although not a lot of clean headroom unless you have a soft touch and single coils) and would be excellent in the recording studio (fairly quiet). I believe it's rated at 12 watts. It loves single coil pickups. The tremolo foot switch is missing in action".
"It has the original transformers, three inputs; Guitar, Accordion, and Microphone, and the controls are Volume, Tone, Tremolo Speed, and Intensity. The tube line up is; 1 6AU6A preamp tube, 2 12AX7 preamp tubes, 2 6AQ5A power tubes, and a 5Y3GT rectifier tube. I am told replacement tubes are readily available. The 12" 1960 Jensen Concert speaker sounds beautiful! The tweed covering is in fair cosmetic condition except for some stains and fraying on the corners which add character. As far as tone, to put it simply, this amp sounds stunning. A vintage amp guru who writes amp reviews for a well known gear magazine wanted to buy this amp from me to use in the studio when he heard it. The tone control works in reverse like a cut except it's interactive with the volume and adds gain! This amp could handle a small sized gig (although not a lot of clean headroom unless you have a soft touch and single coils) and would be excellent in the recording studio (fairly quiet). I believe it's rated at 12 watts. It loves single coil pickups. The tremolo foot switch is missing in action".