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Eddie Current Electra Electrostatic Amplifier - Page 8

post #106 of 429
Sold me, I am ready to order. I figured the price would go up.

Does it look the same as the previous one at the show and you said the transformer is on the floor? Is it a separate box for the power supply now?
post #107 of 429
Thread Starter 

Quote:
Originally Posted by KingStyles View Post

Sold me, I am ready to order. I figured the price would go up.
Does it look the same as the previous one at the show and you said the transformer is on the floor? Is it a separate box for the power supply now?

 

The power transformer and other related components (which are currently residing in the main chassis) will be housed in a separate PS chassis.

 

I believe the casework will undergo some revision. This pre-production unit is in the same chassis as at T.H.E SHOW 

post #108 of 429
Quote:
Originally Posted by kiertijai View Post

I think there is at least one DIY T2 in your area

I think there is at least one DIY T2 in his house.

Reply
post #109 of 429

My ignorance, forget to look into his profile.

Please forget about the BHSE

Looking forward for more impressions using better tubes with the Electra

post #110 of 429
Thread Starter 

Put in the Mullards and things opened up dramatically. Those Sovteks were really bad sounding tubes in retrospect.

 

This is it. I placed my order.

post #111 of 429
Marv, are these mullard production or nos?
post #112 of 429

Thanks,  Very interesting

Are those tubes NOS Mullard XF1, XF2 or XF4?

Any chance to try the NOS Philips EL34 metal base or NOS Gold Lion KT77

How's about the current production of Mullard EL34, new production of Gold lion KT77 or SED Winged C Svetlana EL34?

How much is the introductory price without tubes?


Edited by kiertijai - 7/14/12 at 6:49pm
post #113 of 429
Can we order now? He hasnt responded to my emails of late. I would be curious to know how the new production kt77 will do in it.
Edited by KingStyles - 7/14/12 at 6:16pm
post #114 of 429
Thread Starter 

They are the Mullard XF4s. I also rolled in 4 Sylvania chrome dome GTAs in place of the CBS triangle plate and RCA flat plate 6SN7s. I was slightly concerned for a while because with the crappy Sovteks, the Electra sounded very closed in. With the XF4s, the Electra just opens way up and the sound just draws you in. Unsurprisingly, the XF4s also sound richer than the Sovteks. Unfortunately, I don't have any other EL34s on hand. The 6L6s are supposedly less bassy and analytical, but I haven't heard those myself in this particular iteration of the amp. I've been running the SR-Omega, SR-007mk2.5, and modified HE Audio Jades without any issues. All three headphones sound great and the Electra is capable of letting each of these bring forth their own particular unique traits without screwing up anything (it passed the 007 test).

 

This is really a wonderful tube stat amp which easily competes with or surpasses existing high priced commercial designs. Of course it's going to come down to personal preferences, but I've been waiting for a stat amp to sound like this for a few years. I wish you guys could be here to hear it.

 

I think Craig's been pretty busy on other things, I've mostly be dealing with Andy (with him dropping by and showing me how to adjust bias on the EL34s and allowing me to keep it for another day!) As for cosmetics, I believe the plans are for a thicker front plate, a polished top plate, a gauge on the top for setting bias (so we don't need a multi-meter). Bias selector will be removed and pro-bias and normal-bias jacks provided. The inter-stage coupling cap is currently one of those red WIMAs, which I'm sure an upgrade option will be offered. The dimensions will be the same. I don't know what the final price will be, but I'm sure introductory pricing a la the Super7 will be offered.


Edited by purrin - 7/14/12 at 7:43pm
post #115 of 429
Thanks for keeping us updated.
post #116 of 429
Thanks so much for the update
I think that tube rolling of the 6SN7 will help
improving the sound,
Hope you can try more and enjoy
like you do with S7
Can we also use ECC32, ECC33, 6SL7's (more gain) ?
Edited by kiertijai - 7/15/12 at 6:46am
post #117 of 429

This is starting to sound like a really exciting amp.

post #118 of 429

Yup, if I get bored of the BHSE, the Electra is next on my list.  It looks like it's shaping up to be a contender.

post #119 of 429

Yes if the performance and build are on par with the BHSE the ability to tube rolling of the drivers 6SN7's

would bring more fun and the  ability to optimize the performance of  each electrostatic headphones with tube rolling of 6SN7's

The BHSE uses the same EL34's but no dirvers,  DIY T2 uses EL34's + 6DJ8's  while the Electra uses EL34's + 6SN7's

post #120 of 429

Why on earth is Craig still using 6SN7 in this amp when the 6SL7 is a far better tube for the job?  There is simply not enough low distortion gain in those tubes to have enough headroom for the feedback.  Feed it a SE signal and the amp will struggle with it, making it even more non-linear. 

 

Glad he saw sense WRT the EL34's a there is a simple reason why we use them and not 3d21's/6l6's/6BG6GA's/etc., they are the most linear of the bunch. 


Edited by spritzer - 7/15/12 at 4:51am
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