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Yamamoto Sound Craft HA-02

post #1 of 1327
10/10/06 at 3:34pm
Thread Starter 
Yamamoto Sound Craft HA-02



Mitch
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post #2 of 1327
10/10/06 at 3:45pm
You tease...
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post #3 of 1327
10/10/06 at 8:31pm
So when are you getting it?
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post #4 of 1327
10/10/06 at 8:41pm
That is beautiful, is it a hybrid? what are the tubes it uses? How much? Thanks.
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post #5 of 1327
10/10/06 at 8:52pm
Quote:
Originally Posted by mrarroyo
That is beautiful, is it a hybrid? what are the tubes it uses? How much? Thanks.
It's a 408A/6028, which is a sharp-cutoff pentode. I assume it's connected as a triode.
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post #6 of 1327
10/11/06 at 12:37am
Where are you getting the info from?
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post #7 of 1327
10/11/06 at 8:34am
I have tried it on the last weekend at tube-audio festival in Tokyo.



It has connected with iPod. The mid to high is sweet and sound like other Yamamoto SET amps, I like the sound but I hear slight hum noise from the demo machine.
The tube is Western vintage 408A as Carl san said. the price is 88000 yen. I am not sure the availability in US.

Other headphone amp from the show is softon model 6. it has build in USB-DAC and use one 6922(6DJ8). the price is 47000 yen.

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post #8 of 1327
10/11/06 at 8:49am
Wow...

The wheels start spinning. Can I afford it? What can I sell to get it?

...
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post #9 of 1327
10/11/06 at 11:01am
Thread Starter 
Here's a link to the release sinformation:

http://www2.117.ne.jp/%7ey-s/HA-02-new-e.html





HA-02 specifications Use vacuum tube: Only WE408A 2 tubes / Sircuit system: Single stage amplification, pentode connection, and non-feedback system / Maximum output :300mW (at the time of 50ohm load) of headphone terminals,240mW (at the time of 8-ohm load) of speaker terminals/ Frequency characteristic:30-21,000Hz (headphone terminal) 45-17,000Hz (speaker terminal) / Gain : Headphone output power 9.5dB (at the time of 50-ohm load) Speaker output power: 1.5dB (at time of 8-ohm load) / Remains noise: 100 microvolts of headphone output power 70 microvolts of speaker output power / Outside dimension: 150 (W) 325 (D) 125 (H) / Weight: 3.5kg Price: 88,000 yen

?@
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post #10 of 1327
10/11/06 at 12:39pm
At the time 6moons reviewed their A-08 amp, I remember a comment that Yamamoto would be releasing a headphone / speaker amp. I thought it would be the A-08 with a headphone output, which IMO, would have been a killer product.

Anyone know what kind of speakers the HA-02 could drive? The Zu Druids are 101db. I realize 101db is 101 db, but still, could this drive a cone of that size?

I also wonder about hum. Yamamoto released the A-08s to address the issue, and Sasaki also noticed it in this amp. Was it significant Sasaki? Or were you nit-picking? Any more comments on the overall sound?

Thanks.
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post #11 of 1327
10/11/06 at 12:58pm
Quote:
Originally Posted by Sasaki
I am not sure the availability in US.
Brian at http://venushifi.com/ is the U.S. retailer of Yamamoto products.

Here is the forum if anyone wants to ask any questions. http://audiokarma.org/forums/forumdisplay.php?f=35
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post #12 of 1327
10/11/06 at 2:00pm
I admit the hum is a sort of "nit-picking". It is not noticeable in normal listening volume level.

I took a listen for very short period and surroundings is so loud by the A-08S sound, so I can not comment further but I like the sound. I want to try it again in good listening condition.

Quote:
Originally Posted by Dartagnan
I also wonder about hum. Yamamoto released the A-08s to address the issue, and Sasaki also noticed it in this amp. Was it significant Sasaki? Or were you nit-picking? Any more comments on the overall sound?

Thanks.
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post #13 of 1327
10/11/06 at 7:38pm
Single stage, pentode, open loop? Now that's a design you don't see every day.

Personally if I was going for a pentode I'd have opted for a 47 rather than a 408A.
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post #14 of 1327
11/22/06 at 12:13am
Quote:
Originally Posted by tjkurita View Post
Wow...

The wheels start spinning. Can I afford it? What can I sell to get it?

...
You and me, both, John.

I just shot off an email inquiry to the U.S. distributor, Venus HiFi in E. Lansing, MI. I'll post the response.

Anyone interested in a mini group buy to try to get some price leverage?
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post #15 of 1327
11/22/06 at 12:18am
I ordered one earlier today. Brian at Venus said he expected some more to arrive in 3-4 weeks.
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