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Old 16th February 2017, 05:34 PM   #21
Koifarm is offline Koifarm  Netherlands
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Must wait for some parts. Maybe next week.
And i will do some measurements.
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Old 17th February 2017, 01:57 PM   #22
Koifarm is offline Koifarm  Netherlands
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Played with harmonics by adjusting the bias.
I had very less harmonics with bias around 2.0v.
See the pictures with different harmonics.

Heater voltage is 0.64v, Pete should i go higher with heater voltage?
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Last edited by Koifarm; 17th February 2017 at 02:02 PM.
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Old 19th February 2017, 11:30 AM   #23
Koifarm is offline Koifarm  Netherlands
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Today i measure frequency respons. It was not as good as expected, -8db roll off at 20khz.

Pete, can you confirm this?
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Old 19th February 2017, 11:49 AM   #24
Koifarm is offline Koifarm  Netherlands
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Solved it myself.
Just higher the heater voltage from 0,64 to 0,72v.
Frequency response now -3db at 60khz, just perfect,
I will do new harmonics measurements.
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Old 19th February 2017, 12:35 PM   #25
Koifarm is offline Koifarm  Netherlands
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Harmonics at -59db, noisefloor below -80db.
So next some listening tests.
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Last edited by Koifarm; 19th February 2017 at 12:38 PM.
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Old 19th February 2017, 02:00 PM   #26
pmillett is offline pmillett  United States
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Quote:
Originally Posted by Koifarm View Post
Solved it myself.
Just higher the heater voltage from 0,64 to 0,72v.
Frequency response now -3db at 60khz, just perfect,
I will do new harmonics measurements.
Interesting that it was so sensitive to filament voltage. That is one thing I have not tried varying. I guess Rp much be significantly higher at 0.64V vs. 0.72V.

This makes me wonder if the parameters can be further improved by running at the high limit of 0.8V...

Thanks for posting your results!

Pete
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Old 19th February 2017, 07:45 PM   #27
Koifarm is offline Koifarm  Netherlands
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Schematic as build.
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Old 22nd February 2017, 09:33 PM   #28
Koifarm is offline Koifarm  Netherlands
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This evening there was time for some listening tests.

My first tube amp was a EL34 PP with 6SN7 and 5751 electro harmonics tubes.
This amp was so different from what i was used to listen(Hypex ucd) to, that it was love at first site(hearing). Blues and female vocals sounded performed in a smokey bar as i was there.

My first setup with the harmonizer was source Shanling Cd-t100se and Thorens recordplayer to passive volume/source control to SE 813 tube amp with dynaudio audience 52se speakers. The harmonizer was inbetween the passive control and SE 813 amp. The sound was mixed up, everthing was one blur. Not as without the harmonizer, then the music becomes one with the room and placement is as real i can touch the musicians. So my setup does not need the harmonizer.

Then i changed the SE 813 tube amp for a Ncore500 amp. With the harmonizer as before between passive control and amp. Now was the sound also complete different as without the harmonizer. But this sound was as my first tube amp. And i was back in that smokey bar where Eva Cassidy performs like never before.

I think when bias adjusted so that harmonic distorsion is minimal, the nutube 6p1 a great add on is for people who searching for this great warm sound and do not want to buy big tube amps and disarm they class-d amps.

I have tried a lot of tube buffers for this purpose but this one i like most.
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Old 23rd February 2017, 11:59 AM   #29
erikovsky is offline erikovsky
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Very interested!
I've decided to get this directly from Japan.

I think this is revolutionary tech, worth trying.

But, I am curious, why DIYers seem not to be interested in this stuff?
Because of its price? sound quality?
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Old 23rd February 2017, 06:55 PM   #30
pmillett is offline pmillett  United States
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But, I am curious, why DIYers seem not to be interested in this stuff?
Because of its price? sound quality?
I am a little surprised by the limited interest. Maybe it is not well known enough. And the price is a bit high for many DIYers, a lot more than an NOS battery tube.

In Japan, I believe that they sold a couple thousand to DIYers within the first two months...

Pete
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