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Balancing Act Tube Rolling
Feb 19, 2013 at 11:12 AM Post #271 of 471
I am happy with the EH300b.  I am afraid the PX4 could be too strident for my tastes.  I am extremely sensitive to the upper mid / lower high region and like to keep this area pushed back a bit.  I suspect the 300b family will suit me better.
 
 
Apr 8, 2013 at 3:12 PM Post #272 of 471
Anyone try a Shuguang Treasure CV181-Z in their BA?. If so what are your thoughts?
 
Apr 9, 2013 at 2:29 AM Post #273 of 471
^It certainly matches my adapters & KR PX4 w/B4 bases...but I am finding it a bit "too crispy" on top so far. 
 
Need more time with all of my drivers, but this is at least a quick impression with my output tubes. (And a pic.)
 
Which output tubes are you running and what are you looking to modify with your driver?
 

 
Apr 9, 2013 at 3:05 AM Post #274 of 471
Very nice!
Are these B4 to UX4 adapters?
 
Where did you get them from?
 
Apr 9, 2013 at 3:10 AM Post #275 of 471
cee tee said:
^It [COLOR=006400]certainly matches[/COLOR] my adapters & KR PX4 w/B4 bases...but I am finding it a bit "too crispy" on top so far. 

Need more time with all of my drivers, but this is at least a quick impression with my output tubes. (And a pic.)

Which output tubes are you running and what are you looking to modify with your driver?
Click to expand...


Hello and thanks for your reply. I am running the KR PX4's with a TS BGRP for now. To me, this is a great sounding combo but I just wanted to experiment a bit. If anything possibly soften it up a tad.
 
Apr 9, 2013 at 4:08 AM Post #276 of 471
Quote:
rosgr63 said:
Very nice!
Are these B4 to UX4 adapters?
 
Where did you get them from?
Click to expand...

1. Yes, B4 to UX4 adapters.  
2. A really nice guy who should be in Greece soon.  (I believe that I am recipient #2.)
Quote:
Hello and thanks for your reply. I am running the KR PX4's with a TS BGRP for now. To me, this is a great sounding combo but I just wanted to experiment a bit. If anything possibly soften it up a tad.
Click to expand...

Ah, I've got a couple of TS BG Oval Plates and a couple of <very> used Mullard ECC 35 short brown bases. (I should have the tubes re-tested because I won them on eBay with lots of neglect/dumb luck & through late-night bidding). 
 
Xcalibur255 linked a shot of some of his Sylvanias. If I want a lusher/richer bass to mid/mids with a bit of extra upper-mids but with a softer treble- the middle Sylvania here fits that bill and corresponds to X's "smoky-glass" Sylvania to the far left.
 
I think I would recommend trying to get a Sylvania like the above vs. a Shugang based upon what you mentioned.  However, on Classical or "warm" recordings- the Shugang treble is mitigated...
 
Please give me a bit more time as I get used to the BA, the KRs, the 2.0.2 firmware (I just rolled back to on my PWDII), and the driver tubes I am exploring.  Sharing as I go along.  
tongue.gif

 
Apr 9, 2013 at 5:02 AM Post #277 of 471
Thanks!
 
I agree a Sylvania would fit the bill nicely.
 
However a nice ECC35 is worth a try.
 
Meantime Happy Listening!
 
Apr 9, 2013 at 10:43 AM Post #278 of 471
b4 to ux4 adapter? I could use a coouple of those. Any info?
 
Apr 9, 2013 at 12:23 PM Post #279 of 471
I got mine as Cee Tee did from 2359glenn.
 
Just send him a PM.
 
Apr 9, 2013 at 1:41 PM Post #280 of 471
Quote:
cee tee said:
^It certainly matches my adapters & KR PX4 w/B4 bases...but I am finding it a bit "too crispy" on top so far. 
 
Need more time with all of my drivers, but this is at least a quick impression with my output tubes. (And a pic.)
 
Which output tubes are you running and what are you looking to modify with your driver?
 
Click to expand...

 
What a sexy shot.
 
Not sure if you run it like that normally but from what I understand it is recommended to keep the BA separated from the power supply with more distance to minimize potential hum/feedback problems.
 
I noticed that your power meter is on the right side of the dial; on mine it is on the left side but it is of older production.  What color is the power light?
 
Apr 9, 2013 at 7:35 PM Post #281 of 471
^Thanks!  It sure is a desktop STACK, I know.  I haven't re-organized everything yet...wanted to have all controls right at hand as I dial it in and get to know it. 
bigsmile_face.gif

 
Luckily, no hum or feedback problems with the BA on the PSU on the PWD.  At the last Bay Area Meet, I showed a BA just like this one at my table for Craig. When I first tried to set-up, the BA was directly on top of my PWDII & I did get hum. Craig said that it was probably better to stack the BA on the PSU, that it was probably my DAC that was causing the hum. He said that certain BA power supplies had transformers that "shouldn't be a problem with hum if stacked".  I had to rearrange my table, there are pics where I had the BA stacked on the PWDII and I believe I had to change that...
    
Power light? Red.  After I have settled in with it, I'll try to take some better shots.
 
Sounds fantastic, BTW...I'm loving the amp!
 
Apr 14, 2013 at 10:28 AM Post #282 of 471
To get to 5v, I am turning the control knob to its maximum.  I seem to be getting some variability there as I warmed up the amp for 45 minutes, turned it all the way up which got me barely to 5v then checked it 5 minutes later to be 5.25 v.  Is this indicative of a tube issue - if so, which tube(s)?  Or is it a function of variability in my mains voltage? 

I noticed my meter dips below the zero mark when turned off.  Should it be exactly at zero?  If so, do I set it using the slotted plastic head at the base of the arrow?

Thanks!
 
 
Apr 14, 2013 at 4:04 PM Post #284 of 471
My meter is on zero.
As Cee Tee said, best contact Craig asap.
 
Apr 14, 2013 at 4:08 PM Post #285 of 471
Same here. Meter at zero when turned off and never fluctuates when set to desired setting when turned on (4V for PX4's) 
 
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