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Headamp Blue Hawaii Special Edition - Page 288

post #4306 of 6166
Quote:
Originally Posted by MacedonianHero View Post
 

Regardless, not taught in university anymore...which was my point. And that's back from the 1990s...it's now 20 years later. ;)

What type of engineering did you study?

post #4307 of 6166
Quote:
Originally Posted by wink View Post
 

Tubes are passe, until the sattelites, power stations, comms sysyems etc are hit with an electro-magnetic pulse from an H-Bomb or solar flare coronal mass discharge hits that turns all the solid state silicon into silicon ash.......

Funny, that's the reason behind New Senson Corp in Russia. In case the Americans launched an EMP...now its mostly just audiophiles. We have the Cold War to thank for that.

post #4308 of 6166
Quote:
Originally Posted by justin w. View Post

the silver panels are polished and clear anodized. a clear coat would probably not work. 

Thanks for the clarification. The anodizing process makes a more durable surface.
post #4309 of 6166
No, not necessarily, it's anodized because you can't really clear coat aluminum.
post #4310 of 6166
Quote:
Originally Posted by shipsupt View Post
 

Physical Dimensions (in inches):

 

Amp chassis: 15.5" (width) x 12.5" (depth) x 3" (height). Attenuator adds 13/16" to the 12.5" depth and the RCA jacks add 11/16" more. Cone feet add 1 1/2" to the height and the stock Mullard EL34 tubes when installed add 3 3/4" more.

 

PSU chassis: 7 5/8" (width) x 12 3/8" (depth) x 3.5" (height). Cone feet add 1 1/16" to the height.

 

---

 

Price - I'll leave that one for Justin.

 

--

 

My posts that the silver version is somehow sonically superior have been purely in jest. Sorry that the sarcasm is so poorly transmitted via "the net". There is no "silver bullet" unfortunately.

Thanks :beerchug: 

Asr => the price was not quite clear to me on the site, between 1649 x 4 and 1649 + 1399 x 3 ;)

 

Ali

post #4311 of 6166
Quote:
Originally Posted by spritzer View Post
 

Any spec for the lifetime of tubes has to take into account how the tube is used and how hard it is driven.  I've been using the same set of EL34's in my Blue Hawaii's for the last 10 years and they still measure good.  A lot of that has to do with them only being run at 50% of the max power rating and the old Mullards being bulletproof.  With light use you can expect at least 5-10 years of usage from a set of tubes. 

 

Couple of things, if the filament fails on a EL34 in a Blue Hawaii then the amp should be turned off in an instant and that tube thrown out.  This happened to one of the amps I built and it took out the active cathode load.  Another thing, don't ever use a tube if it indeed looks burnt or if the silver getter has turned white.  The BHSE is a rather expensive tube tester... 

Very interesting information... Justin , do you think the BHSE could be seriously damaged by output tube breakdown?

post #4312 of 6166

All amps can be seriously damaged when a tube fails.  Normally it is just a cathode resistors that overheats and then melts but it can be far worse than that.  Blown output transformers being about as bad as it gets plus a blown power supply in speaker amps. 

post #4313 of 6166
Quote:
Originally Posted by Phil95 View Post
 

Very interesting information... Justin , do you think the BHSE could be seriously damaged by output tube breakdown?

 

it's hard to protect against every breakage scenario in an amp like this. i have only seen tube-related damage from inserting the wrong kind of tube or trying to hot plug tubes when the amp is turned on

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 #4314 of 6166
With hot plugging burning flesh is a good indicator that something is wrong.
post #4315 of 6166

Hi, Justin.

Any good news for this batch of BHSE?

post #4316 of 6166

yes, since i now have some of the front panels i can finish some of the amplifiers. i am currently setting up to do that next week.

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 #4317 of 6166
Quote:
Originally Posted by justin w. View Post
 

yes, since i now have some of the front panels i can finish some of the amplifiers. i am currently setting up to do that next week.

 

 Thks for your update, I really hope to receive it in a few weeks.

post #4318 of 6166

Hi Justin,

 

What about the #47 BHSE repair?

 

THANKS

post #4319 of 6166

Does anyone know what the expected life span of the EL34PH in the BHSE would be in hours?

 

Is there any way of telling when the tubes are close to their demise?

post #4320 of 6166
Quote:
Originally Posted by rsbrsvp View Post
 

Does anyone know what the expected life span of the EL34PH in the BHSE would be in hours?

 

Is there any way of telling when the tubes are close to their demise?


I think it's pretty hard to put an exact number on the lifespan of any tube, especially these, since their relatively new to the market (physical defects excluded),

 

I probably have close to 1500 hours on mine, and they still sound the same and test the same since about the 200 hour mark.

 

If you like the tubes, then I suggest you purchase another pair as reference to your current pair. That way you can compare to see if you think there's any sound loss/differences.

 

Based on your other posts recently, I have a feeling it's nothing to do with the tubes, but more about how your e-stats experience isn't doing it for you anymore...

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