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feedbackless interstage p-p kt88 amp
feedbackless interstage p-p kt88 amp
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Old 26th October 2007, 02:30 AM   #1
robertc is offline robertc  Malaysia
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Default feedbackless interstage p-p kt88 amp

can someone comment this high cost diy amp. with tango interstage and tamura opt. heard that this is the best push pull power amp.
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Old 26th October 2007, 06:19 AM   #2
Miles Prower is offline Miles Prower  United States
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Default Re: feedbackless interstage p-p kt88 amp

Quote:
Originally posted by robertc
can someone comment this high cost diy amp. with tango interstage and tamura opt. heard that this is the best push pull power amp.
So far as this being "the best", I suppose that's a matter of preference. However, feedbackless it ain't. You have an ultralinear connection and feedback to the cathodes off the OPT. That's a lot of feedback. Click the image to open in full size.
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Old 26th October 2007, 07:25 AM   #3
robertc is offline robertc  Malaysia
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yes, miles. you're right, there was a cfb.

Anyone know where i can buy the tango nc14 online?
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Old 26th October 2007, 08:06 AM   #4
AndreasS is offline AndreasS  Germany
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hello,

the Tango NC-14 is for a current of 15 mA, ...

Sources: http://www.eifl.co.jp/index/export/ISO.html

Regards Andreas
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Old 26th October 2007, 11:46 AM   #5
Shoog is offline Shoog
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Quote:
the Tango NC-14 is for a current of 15 mA, ...
The primaries are in parallel so the transformer should be good for 30mA or the required 26mA.

I would guess that this should be an excellent sounding amp.

Shoog
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Old 26th October 2007, 12:11 PM   #6
andyjevans is offline andyjevans  United Kingdom
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I can only imagine the amp would sound better still with 2E22 in the outputs!!
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Old 26th October 2007, 12:30 PM   #7
robertc is offline robertc  Malaysia
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whether this thailand made (I-311P) interstage better then tango nc14?

I-311P 3.0K 3.0K 1+1 : 1+1 15-80,000Hz 60 47 180 2A3, EL84(T), EL34(T)

http://www.sacthailand.com./

Look at the test result.

I got a pair tamura in hand and just need the interstage to build this amp.
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Old 26th October 2007, 02:29 PM   #8
resident is offline resident
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I thing it's better to use a SE interstage...

By the way, I wouldn't trust a company that measures the impedance of their products with a digi-bridge!
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Old 26th October 2007, 02:56 PM   #9
richwalters is offline richwalters
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I've never been entirely convinced that anyone can repeatedly make perfectly balanced p-p interstage transformers which in this case has to be to avoid thd at the higher frequencies. If it is so easy to make them, then it would be the obvious to use'em. Not quite so. Miller effect rules KT88's and not two are sim.

Where is the final amp performance spec (If I've missed it) ?


richj
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Old 26th October 2007, 03:40 PM   #10
robertc is offline robertc  Malaysia
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look like i go for tango nc14. i 'll report the result when everything done.
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