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Headamp Blue Hawaii Special Edition - Page 316

post #4726 of 7003
Quote:
Originally Posted by dude_500 View Post
 

 

I have to wonder if something is wrong with your other tubes if you can hear tube-rolling in an amp with measured T.H.D. across audio spectrum of 0.004%. Or maybe the PH's are incredibly crappy tubes that somehow break the Blue Hawaii's remarkable linearity. If someone has an extra pair of PH's laying around and I could borrow them, I'd be up for publicizing the variations in frequency response and linearity between my NOS Svetlana's and the PH's.

If you have a BHSE then your missing out...

post #4727 of 7003
Quote:
Originally Posted by CorvetteGarage View Post
 

I didnt say they both sounded the same...

 

Both brand tube sets offer different sound signatures for sure.

 

Depending on the music and recording (and lets not forget your gear), one will be better suited.  

 

On my rig, the EL34PH's are more forward in the mids with good bass, good detail but treble is rolled off.  

 

The Treasure's are more laid back in the mids, good bass, blacker background and smooth treble.  I think soundstage is slightly wider with these too.

 

Its all subjective right???

 

 

Both tube sets are great with the BHSE.


I know Rico was joking about the transport with you, but it could be the difference (for example I found the PH soundstage wider).

 

Your right, it's subjective so unless we had a pair of BHSE beside each other to compare, I have to respect your opinion.

post #4728 of 7003
Quote:
Originally Posted by dude_500 View Post
 

... T.H.D. across audio spectrum of 0.004%. 

 

Just curious. Where is this measurement? Under what conditions, load, voltage, test signal, etc.

post #4729 of 7003
Quote:
Originally Posted by purrin View Post
 

 

Just curious. Where is this measurement? Under what conditions, load, voltage, test signal, etc.

 

On the original blue hawaii documentation from Kevin Gilmore. http://headwize.com/?page_id=751

 

The load of the THD measurement is unclear but implied to be the omega 2. Full-range voltage, 800vp-p. THD measurements would generally be done with a sine generator into a spectrum analyzer, although I have no idea exactly how he executed this test.

 

So this is actually the Blue Hawaii, but the BHSE is sure to be about the same (or even better) since it's built on the same topology.

post #4730 of 7003
Quote:
Originally Posted by dude_500 View Post
 

 

On the original blue hawaii documentation from Kevin Gilmore. http://headwize.com/?page_id=751

 

The load of the THD measurement is unclear but implied to be the omega 2. Full-range voltage, 800vp-p. THD measurements would generally be done with a sine generator into a spectrum analyzer, although I have no idea exactly how he executed this test.

 

So this is actually the Blue Hawaii, but the BHSE is sure to be about the same (or even better) since it's built on the same topology.

 

Interesting. Kevin mentioned on another place that:

 

"My personal BHSE(original version) and the T2 both measure about the same at .02% THD+Noise at 400 volts
peak to peak (x2 for balanced) into a 30+ year old sound technology 100a. (that is well maintained)"

 

And I'm not sure the BHSE is sure to be the same (or better) since the layout and BOM might be (slightly or not) different.

 

Justin probably knows.


Edited by ultrabike - 2/21/14 at 4:42pm
post #4731 of 7003

pretty much requires custom C divider/load (polystyrene?) and buffer - enough trouble that some might be tempted to make a single sided measurement which would likely give excess measured distortion

 

not only does balanced drive give some even order cancellation - there is a large element of Black's original feedforward or Pass' SuSy distortion reduction potential in full diff I/O amps driven, measured fully balanced


Edited by jcx - 2/23/14 at 8:46am
post #4732 of 7003
Done engraving the power supply front panels; on to the amp panels today

HeadAmp Audio Electronics - home of the Pico and Gilmore amps.  Now with Audeze, Fostex, HiFiMAN, Sennheiser, and STAX.
Find us at www.HeadAmp.com

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post #4733 of 7003
Quote:
Originally Posted by justin w. View Post

Done engraving the power supply front panels; on to the amp panels today

Those purple panels look incredible!
Thanks for the update Justin.
post #4734 of 7003

tempting !!! :popcorn:

post #4735 of 7003






Panels engraved

HeadAmp Audio Electronics - home of the Pico and Gilmore amps.  Now with Audeze, Fostex, HiFiMAN, Sennheiser, and STAX.
Find us at www.HeadAmp.com

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post #4736 of 7003

Great stuff Justin!

 

Any news on the few silver panels that you received back around Christmas last year?

post #4737 of 7003
Quote:
Originally Posted by hpz View Post

Great stuff Justin!

Any news on the few silver panels that you received back around Christmas last year?
I think if you read back few pages you will find your answer.
post #4738 of 7003

i have them, just didnt photograph the engraving

HeadAmp Audio Electronics - home of the Pico and Gilmore amps.  Now with Audeze, Fostex, HiFiMAN, Sennheiser, and STAX.
Find us at www.HeadAmp.com

Reply
post #4739 of 7003
Quote:
Originally Posted by justin w. View Post







Panels engraved

What color is the first one? Grey? It looks sexy!
post #4740 of 7003
Quote:
Originally Posted by nickif View Post


What color is the first one? Grey? It looks sexy!

The first one is silver.  Folks are going to be in for a real treat when they take the delivery of the BHSE.  The build quality is just the best in business just like the sound quality.

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