• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Help me identity this amp


2013-02-06 4:49 pm
I got a pair of these and I'm not sure what they are, they look to be too old and well built to be home made. Only marks are HT-1-101. Tube layout is 2 5881 5v4 2 6SN7. Any help would be greatly appreciated. Thanks


Yes, it appears to be commercially manufactured. Nothing like a front panel, so possibly intended to be buried inside a PA system, musical instrument (organ?) or maybe a large console stereo.

The rubber grommets on the standoff feet suggest that it might be a "hot chassis". Is that the case?

Is the tube complement marked? The octal sockets, and absence of 7- or 9-pin miniature sockets suggests design prior to roughly 1950, but doesn't rule out manufacture as late as around 1960. However, the blue plastic sleeves on the capacitors suggest a later date - or perhaps a repair or refurbishment at a later date.