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Joined: Nov 2006
Posts: 192
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Joined: Nov 2006
Posts: 192 |
Looks like an old PBK 150 Executone AMP.
JUNO
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Joined: Jul 2010
Posts: 61
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Joined: Jul 2010
Posts: 61 |
Having worked for Executone from 1970 to the 80's I can tell you that it is not any Executone model I have ever seen and some of those were 40+ years old when I worked on them.
I'm a black & white type of guy.....the only grey in my life is the hair on my head!
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Joined: Dec 2005
Posts: 7,056
RIP Moderator-Mitel, Panasonic
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RIP Moderator-Mitel, Panasonic
Joined: Dec 2005
Posts: 7,056 |
Probably not a Kit. Heathkit and most of the others made you bolt in the tube sockets. Those are riveted.
When I was young, I was Liberal. As I aged and wised up, I became Conservative. Now that I'm old, I have settled on Curmudgeon.
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Joined: Oct 2006
Posts: 3
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Joined: Oct 2006
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I work for a large suburban school district's maintenance department and have seen a bunch of these PA amps in cabinets mounted on the wall in cafeterias and auditoriums. Usually made for Dukane or Rauland or Bogen etc.. Usually had a Shure mic mixer in front of them.
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Joined: Feb 2006
Posts: 1,716
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Joined: Feb 2006
Posts: 1,716 |
That is a 50 Watt power amplifier with a built in pre-amp. This is what ALL electronic assemblies looked like before the era of mass produced, automated assembly. This was a hand wired assembly and it looks like it was well cared for.
The amplifier schematic will look very similar to class AB amplifiers manufactured by RCA, Executone, DuKane, Bogan and a host of other manufacturers of the late 1950s to late 1960s era. The input is capacitor fed into a pre-amp and then capacitor fed to the power output. There is some feedback sent from the finals back to the pre-amp as a bias moderator to provide a modest AVC. I have serviced this amplifier and, most likely, it is one of several for a PA system from a school, factory or hospital. Unless it's missing parts, a general schematic for a class AB amplifier will come really close to looking like this.
The only thing that may be worth replacing are the electrolytic capacitors. They do dry out and it's far less trouble replacing them now then when they explode.
Rcaman
Americom, Inc.
Where The Art And Science Of Communications Meet
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Joined: Aug 2006
Posts: 1,811 Likes: 15
Moderator-Iwatsu
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Moderator-Iwatsu
Joined: Aug 2006
Posts: 1,811 Likes: 15 |
The original post is a year and a half old...
FWIW, the OP mentioned 'Terryphone', and that's probably right. We have a steel plant for a customer that calls their paging system 'terryphones' even though the system was replaced with Aiphones nearly 20 years ago.
Sometimes the thoughts in my head get so bored, they go for a stroll through my mouth. This is rarely a good thing.
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