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Old 7th January 2005, 03:19 PM   #1
robertc is offline robertc  Malaysia
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Default tamura opt need help

hello, i'm a newbie. i got a pair of tamura pp opt 100 watt with 2 terminals feedback marked cf1 & cf2. can anyone tell me how to use these feedback for pp kt88 power amp.thanks.
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Old 7th January 2005, 03:42 PM   #2
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Cf1 should go the feedback resistor and Cf 2 should go to ground
I am based in KL, Msia
If u are around this area perhaps i can help by taking a better look at it.
But the suggestion above is standard
Cheers
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Old 8th January 2005, 08:03 AM   #3
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Default Re: tamura opt need help

Quote:
Originally posted by robertc
i got a pair of tamura pp opt 100 watt with 2 terminals feedback marked cf1 & cf2. can anyone tell me how to use these feedback for pp kt88 power amp.thanks.
I think you have a set of OPTs with cathode feedback taps; basically windings intended to apply negative feedback by being placed in series with the cathodes of the output valves.

If I'm right, you'll have to place them in series with the cathodes of the output stages.

Do you have a model number on the OPTs?
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Old 8th January 2005, 08:23 AM   #4
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Hi,

Quote:
I think you have a set of OPTs with cathode feedback taps;
Exactly.

Tamura F 2011 or 2012 probably.

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Old 8th January 2005, 01:48 PM   #5
robertc is offline robertc  Malaysia
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thanks, model F 2011. can i connect the cf1 & cf2 like marantz model 9?
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Old 8th January 2005, 02:01 PM   #6
845 is offline 845  Israel
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Default CF

This way
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Old 8th January 2005, 02:39 PM   #7
robertc is offline robertc  Malaysia
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is there any power increase with connecting the cf.
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Old 8th January 2005, 03:51 PM   #8
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Hi,

Quote:
is there any power increase with connecting the cf.
No.

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Old 9th January 2005, 12:39 AM   #9
robertc is offline robertc  Malaysia
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so what is the purpose of cathode feedback?
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Old 9th January 2005, 04:32 AM   #10
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Quote:
Originally posted by robertc
so what is the purpose of cathode feedback?
Reducing distortion, which it does quite well.

Not everything is about more power....
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