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Eddie Current Electra Electrostatic Amplifier - Page 30

post #436 of 444

The previous version was better than the previous version with the gain modified.

post #437 of 444

:basshead:

post #438 of 444

Hi all, giving this a little bump. This past weekend the folks in Tokyo had a Stax amp shootout - we had the BHSE, KGST, my(Radiohead's) Electra. I won't dwell too much about the comparisons and will leave  that to @arnaud to divulge more about the general comparison but will focus more on my Electra and to get tips from other Electra owners on how I could further tweak it.

 

There is the peculiarity to the midrange "hump" with a hairline more treble edginess giving an overall more aggressive and compressed/congested signature in comparison to the BHSE (and to the opposite end of the spectrum, the KGST which sounded mellow) - all this on the SR-009.

 

I'm using XF2s in my output stage, Electro Harmonix for 2nd stage and Tung Sol 6SN7GTB for first stage. Any recommendations on how to "tone down" the midrange and smooth down the trebles a little? More precisely to the question, is there a methodology to tube swapping the 1st, 2nd stage, and/or output stage or is it more just a trial and error in just swapping all 3 randomly to see what sounds best?

post #439 of 444
Quote:
Originally Posted by AnakChan View Post
 

Hi all, giving this a little bump. This past weekend the folks in Tokyo had a Stax amp shootout - we had the BHSE, KGST, my(Radiohead's) Electra. I won't dwell too much about the comparisons and will leave  that to @arnaud to divulge more about the general comparison but will focus more on my Electra and to get tips from other Electra owners on how I could further tweak it.

 

There is the peculiarity to the midrange "hump" with a hairline more treble edginess giving an overall more aggressive and compressed/congested signature in comparison to the BHSE (and to the opposite end of the spectrum, the KGST which sounded mellow) - all this on the SR-009.

 

I'm using XF2s in my output stage, Electro Harmonix for 2nd stage and Tung Sol 6SN7GTB for first stage. Any recommendations on how to "tone down" the midrange and smooth down the trebles a little? More precisely to the question, is there a methodology to tube swapping the 1st, 2nd stage, and/or output stage or is it more just a trial and error in just swapping all 3 randomly to see what sounds best?

 

 

This should be interesting.  What DAC was used?  Was the same DAC used with each amp?

post #440 of 444
TotalDAC D1-Dual to BHSE (monoprice xlr) > loop-out to KGST (monoprice xlr) > electra (monoprice xlr). Also, a stac SRM 007t2 driven from D1 unbalanced outputs (monoprice rca). All amps were volume matched to ~10mV (out of >40V Rms across stators using 1kHz sine wave). I used my sr009.

My impressions were that the BHSE was well ahead of the others. The KGST was very mellow and tight bass (like a good solid state amp) but felt dynamically compressed compared to bhse along with smaller stage. I would probably really like the kgst on its own (and it's just a good pairing to the 009) but, in direct comparison, I felt the BHSE so much more transparent and closer to the recording. The BHSE was like wire with gain (without sounding harsh or brittle as the source isn't) while the KGST was sounding similar on all musics, always imposing the same kind of signature (mellow / dynamically restrained but very smooth / natural, bit rolled off highs, tight bass but missing sub-bass).
The BHSE had so much kick, it sounded louder even though all amps were level matched within.
The 007t was reminiscent of the KGST but even more rolled off at both ends and dynamically compressed.
The electra was very upper mid centric, with similar highs extension to the BHSE but harsher sounding (who would have thought!!!). We suspect it's the tubes but that will be for another meet...

Had a very brief dacs comparisons but that is much harder to do (need to switch USB output, need to switch amp input, needed to use unbalanced out of the D1 effectively only using half the circu, could not level match). To make matters worse, we were running out of time and got barely 20min to compare the D1 to Lavry DA11 (no comparison), Audio GD M7 (felt much closer to the D1 than all the others) and Invicta (less precise imaging, less instruments separation, less body, but not the HF hash of sabre dacs at all, it sounded pretty good to me on its own).

Also had a brief comparison between my 3+ year old SR009 and the brand new unit one friend brought over. At first I thought the new one was slightly edgier / more upper mids. At the end of the meet, I felt the new unit to have firmer bass and more precise layering / instrument separation as if the diaphragm was better controlled. I would need much more time to properly evaluate due to the subtle changes.

Overall, it was a very very fun day that passed by way too fast. We have to do this again soon, there are so many other comparisons to be made (and more serious dac shoot out).
post #441 of 444

It was very enjoyable and more importantly an enlightening experience. Will have to do it again when I get to try other tubes. You're on for another shootout!!

post #442 of 444
🍻
post #443 of 444

For my electra I use as tube:

 

I'm using Mullard  XF4s in my output stage,  Tung Sol BGRP  for 2nd stage and Mullard  ECC32 for first stage.

 

With this configuration for me the Electra does not sound harsh.

post #444 of 444

Can anyone confirm that a new version of this amp is still in future plans? 

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