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Eddie Current Electra Electrostatic Amplifier - Page 12

post #166 of 419
Thread Starter 

 

 

There is going to be a 1/4" front plate (not shown).

post #167 of 419

Any more impressions?

Craig has emailed me that it worked great with the Purrin's modded HE audio Jade and I would like to

know which is that model? 1.2B or 1.3

Craig also informed me that the HE90 socket can also be done but he did not include that in the Electra

because of the difficulty to find the parts and its price

post #168 of 419
Quote:
Originally Posted by n3rdling View Post

If it only has a pro bias Stax jack then I don't think the adjustable bias is a huge issue.  You don't want to offer adjustable bias on an amp with a normal bias jack because then newbies would definitely plug a normal bias Stax in, jack up the bias, and burn up the diaphragms.  With only a pro bias jack, you're dealing with pro bias phones and adapters, which likely means HE60/HE90/ESP950/Jade.  Normal bias Stax won't fit into the jack and nobody uses normal to pro adapters.  I believe HE60 runs at 540v, HE90 at 500v, ESP950 at 600v, and Jades at 600v.  Giving the adjustable bias a range up to 600v would probably be fine for all those headphones besides maybe the HE90 for extended periods of time.  There would probably only be a few people in the world to have both the HE90 and Electra, so the chances of somebody messing those up would be pretty slim, especially if Craig makes it known to purchasers what max bias the headphones should be run at.  After that it's their own fault...like turning on a dynamic amp at full volume with sensitive headphones plugged in, etc.

You are making a lot of sense here, so probably it's not going to happen confused_face_2.gif

post #169 of 419

I thought the Electra sounded very nice at the meet and I can see how people who listen to more modern or harder music would prefer this say over the BHSE which is more accurate.  There was a nice warmth with the 009.  This was with the stock Mullards.  Marv told me it really sounded great with better EL34s and I can see how it would.

 

If it were me, I would still choose the BHSE probably, but I am not in the market for an amp since I build my own these days.

 

Between this and the Cavalli LL, the Electra was superior to me, more detail.  But then you need 8 tubes for the Electra which has its downsides and costs.

post #170 of 419
Thread Starter 

^ What blubliss said. In terms of tonal balance, which seems to be of interest to many, I would just add that LL and Electra were darker/warmer sounding than the BHSE/T2DIY, and the T2DIY's bass (and everything else) kicks harder than the BHSE.

 

As far as the Jade, I believe the various versions were simply cosmetic? I've measured 1.2B and 1.3 and they looked the same. Anyone have a spare Jade for sale?


Edited by purrin - 8/21/12 at 4:57pm
post #171 of 419
That chassis is quite big. I would imagine the tube selection would have a large impact on how warm, detail, etc it is since there is a huge amount of tubes for both types ranging from neutral to warm.
post #172 of 419
Many thanks for the comments blubliss and marv. I assume there was again no assesment where the stax amps (727 for example) are positioned (with the 009 that is, I know it is no comparison with something the like Omega 2)?
post #173 of 419
Thread Starter 

The "bloatedness" of the SRM727's bass can be heard through the SR009. It was difficult for me to make a further assessment because the bloated character of the SRM727 was everpresent. All of the other the amps offered much better control of the bass compared to the SRM727. You know how it goes. It's "good" until you hear something better. KG/Spritzer's mod on the 727 is much recommended.

post #174 of 419
Thread Starter 
Quote:
Originally Posted by KingStyles View Post

That chassis is quite big. I would imagine the tube selection would have a large impact on how warm, detail, etc it is since there is a huge amount of tubes for both types ranging from neutral to warm.

 

Yes, tube selection is critical. For my in home audition, I chucked the triangle plate CBS/RCA 6SN7's in favor of Sylvania GTA chrome domes. I used Mullard XF4s for the output tubes. The differences were significant, particularity with clarity, detail, and openness. I don't why Craig used the POS current production Mullards. I fathom it's because they are readily available.

 

As a baseline, the Electra is naturally darker/warmer sounding than the BHSE and T2DIY.


Edited by purrin - 8/21/12 at 6:38pm
post #175 of 419

I hate bloated bass and always recognize it (such as in JVC DX1000s, Grado PS1000s, sometimes Denon D7000s).

So just FYI, I hear no bloated bass at all with my SR009s and the Stax 007t/ii amp. Just the opposite: the bass is controlled, transparent, and "just there" when it's part of the music.

I have not heard the 727 amp, but I just wanted to add my findings to the discussion in case anyone is interested.

post #176 of 419
Quote:
Originally Posted by rgs9200m View Post

I hate bloated bass and always recognize it (such as in JVC DX1000s, Grado PS1000s, sometimes Denon D7000s).
So just FYI, I hear no bloated bass at all with my SR009s and the Stax 007t/ii amp. Just the opposite: the bass is controlled, transparent, and "just there" when it's part of the music.
I have not heard the 727 amp, but I just wanted to add my findings to the discussion in case anyone is interested.

It's the same here with the 009/727A (stock) pairing actually. I know the Omega 2 mk2 is a mess with this amp and have measured data to back it up ( from this post http://www.head-fi.org/t/498292/my-diy-electrostatic-headphones/435#post_8607847 ):

http://www.head-fi.org/content/type/61/id/662550/

As you can see the bass is ruler flat and there's no midbass emphasis as is the case with the 007mk2 driven from the same amp. I can't imagine much firmer bass (else it may sound seriously lean). I appreciate the comments anyhow Marv (and anyone who would pith in).
post #177 of 419
Thread Starter 

The 007t, which I've heard with the "boomy" O2mk2.5s delivers bass quite differently than the 727. It's actually not bad. I'm inclined to go with Spritzer on STAX seriously screwing up something with the 727. And as I've indicated, I'm sure the mod would help tremendously. It's all matter of reference, and you have to understand where I'm coming from actually having heard the LL, Electra, T2, etc. in my home - and none of those amps can be considered bass-lite e-stat amps. They simply produce a cleaner and tighter sound.

 

I would be curious about measured distortion. Bloated, uncontrolled, or muddy bass often equates to higher distortion.


Edited by purrin - 8/21/12 at 9:16pm
post #178 of 419
Quote:
Originally Posted by purrin View Post

I would be curious about measured distortion. Bloated, uncontrolled, or muddy bass often equates to higher distortion.

Point taken Marv. I was planning to add csd post-processing and impulse response extraction from the data so I will see if I can also add some distortion data. Only thing is the mic is notoriously noisy so I am sure how meaningful a result I will end up with...
post #179 of 419
Thread Starter 

Heh yeah. I do the measurements in the middle of the night for best results.

post #180 of 419

I own 727A Stax amplifier before and after Spritzer modification there is significant difference not only for the

bass response but there is overall improvement in the performance especially with the O2mkI.   However for

the SR009 the sound may be too bright in my setup and my genre of music.  007t may be better for SR009.

Is the sound signature of the Electra similar to the Singlepower ES1/ES2???  I think they use similar tubes

but of course we all know about the problem of the Singlepower.

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