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Antique Sound Labs KI22 Fox
Antique Sound Labs KI22 Fox
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Old 14th September 2021, 06:49 PM   #11
itsgarth is offline itsgarth
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Join Date: Jul 2019
Quote:
Originally Posted by audiohead View Post
What is the primary impedance of output transformer T2?

Art
Not sure...
I'd have to take the amp apart again to test it
and it doesn't show on the schematics
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Old 14th September 2021, 08:16 PM   #12
Koonw is offline Koonw
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Join Date: Apr 2013
Input tube should be 6sl7 for both, that's likely to be a mis-print. Attach is a sketch of schematic.
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File Type: png K122 sketch.png (60.0 KB, 48 views)
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Old 14th September 2021, 09:29 PM   #13
itsgarth is offline itsgarth
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Join Date: Jul 2019
Thanks for your help Koonw
I finally found a copy of the manual that came with my amp.
I remembered it having a tube chart but it also had a schematic with it!!!
I've scanned it to pdf and included it here.
now to try and figure out the diferences
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File Type: pdf KI22-FoxDT.pdf (1.33 MB, 13 views)
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Old 14th September 2021, 10:07 PM   #14
audiohead is offline audiohead  United States
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Join Date: Mar 2005
Location: Los Angeles, California
Just in case if u r interested to measure the primary impedance of the output transformer:

N1/N2 = V1/V2
Z1/Z2= (N1/N2)^2
Z1=Z2*(N1/N2)^2

Where: N1/N2 turns ratio
V1/V2 : Primary voltage/Secondary voltage
Z1= Primary impedance
Z2= Secondary impedance

You need to have an audio generator set to 1KHZ connected to the secondary an ac voltmeter or scope to measure the primary voltage of the output transformer. The amp must be powered off and secondary not terminated.

Then use the above formula to calculate the primary impedance.

Art
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Old 15th September 2021, 02:01 AM   #15
Koonw is offline Koonw
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Join Date: Apr 2013
Quote:
now to try and figure out the diferences
If indeed the 1st stage is 6sn7, the operating points would be quite different some thing like 60V on the plate compared with 152V when it's 6sl7.
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Old 15th September 2021, 03:20 AM   #16
itsgarth is offline itsgarth
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Join Date: Jul 2019
There are indeed 6 6SN7s in the amp.
6SN7EH's to be specific.

I took pictures of it when I was working on it.
once I have more energy I'll haul it back out to the shop and take some measurements.
Attached Images
File Type: jpg KI22 inside.jpg (501.7 KB, 24 views)
File Type: jpg KI22 left.jpg (280.5 KB, 23 views)
File Type: jpg KI22 Right.jpg (327.3 KB, 23 views)
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