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weird solid state amp with interstage transformer

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  • Helmholtz
    replied
    Originally posted by Dulles View Post
    I got this nearly 40lbs chunk of metal on my table that appears to be some kind of 400W amp. Looks like a Bell Labs creation circa 1970 and described on this page. Does anyone have a schematic for this thing? The one on the page linked above became "404".
    The link in the other forum doesn't open.
    Are you sure that it's an interstage transformer and not an OT? What's its size, can we see pictures? Where is it connected?
    A 70V line only makes sense for power distribution - not for signal level. Typically the amp has a step-up OT and each speaker a step-down transformer.

    https://en.wikipedia.org/wiki/Consta...speaker_system
    Last edited by Helmholtz; 11-09-2019, 08:58 PM.

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  • Dulles
    replied
    Very illuminating, thanks. So is the interstage transformer in the unit a global audio line transformer output that eliminates the need for a speaker to have its own transformer or just the 70V interface that allows the speaker with transformer to connect to it?

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  • glebert
    replied
    Originally posted by DrGonz78 View Post
    Isn't 70v the output used for outdoor speakers or something?
    https://www.belden.com/blog/broadcas...peaker-systems

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  • DrGonz78
    replied
    Isn't 70v the output used for outdoor speakers or something?

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  • Dulles
    replied
    Your question prompted further sleuthing and I believe you're right. It appears to be a clock tower amp made by Bell Electronics (now possibly Abell Electronics) not Bell Labs. The wiring is very tidy; the conduits are appropriately twisted and the layout is nice and tight. This indicates the designer understood parasitics. I'd like to get it hooked up to hear what it sounds like. Other strange things about this amp beside the interstage tranny are its 4 pin power input and 1V max signal input. It shows 70V on its panel which could either be its rails or its swing. I might be looking at a class A amp. Anyone else have a clue about this thing?
    Last edited by Dulles; 11-09-2019, 06:02 PM. Reason: spelling

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  • glebert
    replied
    Was it made by Bell Labs or is it a bell ringer (or bell tower) amplifier? Google tells me that Verdin is a bell, carillion, and organ company. Seems many of their amplifiers were made by McIntosh.

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  • Dulles
    started a topic weird solid state amp with interstage transformer

    weird solid state amp with interstage transformer

    I got this nearly 40lbs chunk of metal on my table that appears to be some kind of 400W amp. Looks like a Bell Labs creation circa 1970 and described on this page. Does anyone have a schematic for this thing? The one on the page linked above became "404".
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