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Old 5th April 2020, 01:25 AM   #21
vkung is offline vkung  Canada
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To be honest with you, I have never asked.. They will not provide too.
This is the characteristic of Mr Fujita.

Last edited by vkung; 5th April 2020 at 01:37 AM.
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Old 5th April 2020, 01:52 AM   #22
planet10 is offline planet10  Canada
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Unfortunate. The number is every bit as important as power output given that low power drives people to look for higher efficiency speakers, not knowing how important the amps output impedance interacts with the speaker impedance.

I often see Klipsch speakers put forward, when you can see that these typiclly have really ugly impedance curves, and need a low output impedance amplifier.

How many of your customers are unhappy with the amps because they have choosen to use higher efficiency loudspeakers with non-flat impedance?

Can you get the amps measured?

dave
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Old 5th April 2020, 02:10 AM   #23
vkung is offline vkung  Canada
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you are the first person to ask me.

I really have no issue to connect any efficient speaker.. from low cost Fostex to expense AER BD3 and 4.
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Old 5th April 2020, 02:18 AM   #24
planet10 is offline planet10  Canada
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More will. Particularily as the message gets out of the importance of this interaction. Best to be prepared, and it might save some bad mouthing of the amps because they choose badly matching speaker.

From what the OP posted he could have easily gone down that rat hole.

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Old 5th April 2020, 03:03 AM   #25
vkung is offline vkung  Canada
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I am not worrying. All the specs are-printed in the manual .
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Old 5th April 2020, 03:53 AM   #26
planet10 is offline planet10  Canada
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The manual is where? And if all the specs are there, then the output impedance will be there (even if in the bastardized version called damping). What is it?

I worry about any amplifier with highish output impedance, not a bad thing you just have to take greater care choosing speakers.

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Old 5th April 2020, 01:12 PM   #27
Ttubrag is offline Ttubrag  United States
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This article would have driven me right to the Klipsch RP-600M, but I will look into the Fostex that Victor recommended.

Gramophone Dreams #27: EleKit TU-8600R amplifier kit Page 2 | Stereophile.com
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Old 6th April 2020, 12:55 AM   #28
Wansmith is offline Wansmith  Australia
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There are some measurements here by someone who tested the amp themselves (the original TU8200 version): Elekit TU-8200 Tube Amp Review
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Old 6th April 2020, 01:39 AM   #29
planet10 is offline planet10  Canada
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The sterophile review was complementary, but no measurements.

From that last post:

Quote:
At 1 kilocycle, the output source impedance is 2.93 Ω at the 8 Ω setting, which is a Damping Factor of 2.7.

At 1 kilocycle, the output source impedance is 1.88 Ω at the 4 Ω setting, which is a Damping Factor of 2.1 into 4Ω, 2.7 into 5Ω or 4.3 into 8Ω.
On the high side for SE, this amp will significantly interact with the speaker impedance. Thanx Wansmith.

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Old 9th May 2020, 11:15 PM   #30
Ttubrag is offline Ttubrag  United States
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I found this:
YouTube

and was wondering whether this was a worthwhile proposition. Amazon sells these RP-600Ms 'renewed' for $419. With the new electronics it might be a good value and there's some diy fun involved.
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