Help me identity this amp

pasohifi · 6th February 2013, 04:21 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

dchisholm · 6th February 2013, 05:49 PM

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.

Dale

pasohifi · 6th February 2013, 06:00 PM

The rubber grommets look added, the arms on the chassis look like it was mounted to something.

Yes the caps are new, so it was refurbished at one point.

The tube layout, input ect.. are marked with paint, suggesting factory markings

vinylkid58 · 6th February 2013, 06:11 PM

Quote:

Originally Posted by pasohifi

Tube layout is 2 5881 5v4 2 6SN7.

Same as my Heathkit W4-AM's. So possibly a Williamson kit, as the transformers are attached with machine screws, not rivets.

jeff

Frank Berry · 6th February 2013, 06:23 PM

The rubber grommets are probably there to isolate the chassis from cabinet vibrations.

simon7000 · 6th February 2013, 09:05 PM

They scream electric organ amplifiers to me. They would have been used in a large church type system. These were built up of many different stock speaker cabinets and amplifiers. As many as the front wall would hold.

pasohifi · 6th February 2013, 09:12 PM

Does any one have a ballpark value for them? Working with tubes?

Thanks

6th February 2013, 04:21 PM	#1
pasohifi diyAudio Member Join Date: Feb 2013	Help me identity this amp 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

6th February 2013, 06:23 PM	#5
Frank Berry diyAudio Member Join Date: Sep 2003 Location: Midland, Michigan	The rubber grommets are probably there to isolate the chassis from cabinet vibrations. __________________ Frank

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6th February 2013, 05:49 PM	#2
dchisholm diyAudio Member Join Date: Mar 2011 Location: St Louis, Mo	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. Dale

6th February 2013, 06:00 PM	#3
pasohifi diyAudio Member Join Date: Feb 2013	The rubber grommets look added, the arms on the chassis look like it was mounted to something. Yes the caps are new, so it was refurbished at one point. The tube layout, input ect.. are marked with paint, suggesting factory markings

6th February 2013, 09:05 PM	#6
simon7000 diyAudio Member Join Date: Nov 2008 Location: Oakmont PA	They scream electric organ amplifiers to me. They would have been used in a large church type system. These were built up of many different stock speaker cabinets and amplifiers. As many as the front wall would hold.

6th February 2013, 09:12 PM	#7
pasohifi diyAudio Member Join Date: Feb 2013	Does any one have a ballpark value for them? Working with tubes? Thanks