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 Post subject: Western Electric KS 16617 LI
PostPosted: Nov Fri 23, 2018 8:17 pm 
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Location: Radio Heaven, North Carolina, near Charlotte, 28106-3015
A friend gave me an interesting little amp the other day, it's a Western Electric KS 16617 LI, uses 3 6V6 tubes in the output. It came with all it's tubes except it's missing one 6V6, I'll have dig one out of my tube stock.
My friend said he thought it was a theater amp.


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 Post subject: Re: Western Electric KS 16617 LI
PostPosted: Nov Fri 23, 2018 8:58 pm 
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Location: Sayreville, NJ 08872
Ron in Radio Heaven wrote:
A friend gave me an interesting little amp the other day, it's a Western Electric KS 16617 LI, uses 3 6V6 tubes in the output. It came with all it's tubes except it's missing one 6V6, I'll have dig one out of my tube stock.
My friend said he thought it was a theater amp.

3 tubes in the output? I would like to see the output transformer for that :D It's two 6V6's in the output. The other octal tube in the area is a 5Y3.
Spec: https://www.google.com/url?sa=t&rct=j&q ... OlvIQun1Ui
Dukane and Component Cable were at least two manufacturers for the amplifier supplied to WECo.

Circuit Description: https://www.telephonecollectors.info/in ... 01-bc/file
Schematic: https://www.telephonecollectors.info/in ... 01-bc/file

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 Post subject: Re: Western Electric KS 16617 LI
PostPosted: Nov Fri 23, 2018 10:24 pm 
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I see it is described as an intercom amp. That may explain the 8 Watt output, maybe designed to minimize distortion?
Otherwise 6V6 tubes with plate volts near 300 vdc in Class AB would have an output of about 14 Watts.
Ron, please post the B+ when you get around to checking it out.

It sure is clean, and it's WE. 8)

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 Post subject: Re: Western Electric KS 16617 LI
PostPosted: Nov Sat 24, 2018 12:39 am 
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westcoastjohn wrote:
I see it is described as an intercom amp. That may explain the 8 Watt output, maybe designed to minimize distortion?
Otherwise 6V6 tubes with plate volts near 300 vdc in Class AB would have an output of about 14 Watts.
Ron, please post the B+ when you get around to checking it out.

It sure is clean, and it's WE. 8)

Various voltages are posted on the schematic listed in my previous post.
Although a WECo item, it wasn't made by WECo and, probably has no WECo parts in it

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 Post subject: Re: Western Electric KS 16617 LI
PostPosted: Nov Sat 24, 2018 12:50 am 
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Location: Haledon, NJ, usa
What does r29, r32 and c16 do?
Tone? or what?
... why is r32 10 watts?

Schematic:
https://www.telephonecollectors.info/in ... 01-bc/file

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 Post subject: Re: Western Electric KS 16617 LI
PostPosted: Nov Thu 29, 2018 2:13 am 
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High frequency rolloff. There's a fairly large shunt cap (1000 pF) earlier in the audio chain for the same reason. They ran negative feedback from the transformer to five stages earlier, then had to make it STABLE. But I doubt they wanted a lot of high-frequency response anyway. There's a compressor stage too, using a 6BA6 as a AGC element

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