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Ordered Leben cs300xs (Arrived with photos) - Page 3

post #31 of 144
Quote:
Originally Posted by Clayton SF View Post

 

Shoot, I just ordered and got a pair of 5751 to use in my CS300SX which I ordered a month ago (it still has yet to be delivered). Does that mean that the 5751 pair is unusable in the latest version of the Leben CS300SX?


From what I read, 12AX7 can be substitute with 5751 or ECC83, at least what I read from tubeworld.com. 

Anyone can confirm this?  What did lebenhifi said? did you ask this question to them?

post #32 of 144
Quote:
Originally Posted by Skylab View Post

Interesting.  Mine has the cover/box, like in Miguel's picture.  Not sure what's in or under there, though...



Might be a capacitor like in the CS300 (think that black thing is a capacitor anyway)

Leben1.JPG

post #33 of 144
Quote:
Originally Posted by RedBull View Post


From what I read, 12AX7 can be substitute with 5751 or ECC83, at least what I read from tubeworld.com. 

Anyone can confirm this?  What did lebenhifi said? did you ask this question to them?






5751 is just a lower gain version of the 12AX7/ECC83 so yes, these tubes can sub for each other. You may just have to crank the volume a little more with 5751...often a good thing for many systems.

I have many 80s military 5751 and they are all excellent.
post #34 of 144
Quote:
Originally Posted by RedBull View Post


From what I read, 12AX7 can be substitute with 5751 or ECC83, at least what I read from tubeworld.com. 

Anyone can confirm this?  What did lebenhifi said? did you ask this question to them?


I was going to wait until I received my Leben in case anything else out of the ordinary popped up. But judging from a little feedback from Skylab and some research it seems that the main difference between the 12AX7 and 5751 is that the latter tube has a little less gain (about 70% of the 12AX7) which would give one a little more control on a stepped attenuator. Meaning that you can use more steps on the attenuator to achieve the same increase in volume level when using the 5751 over the 12AX7.

post #35 of 144
Quote:
Originally Posted by Clayton SF View Post




I was going to wait until I received my Leben in case anything else out of the ordinary popped up. But judging from a little feedback from Skylab and some research it seems that the main difference between the 12AX7 and 5751 is that the latter tube has a little less gain (about 70% of the 12AX7) which would give one a little more control on a stepped attenuator. Meaning that you can use more steps on the attenuator to achieve the same increase in volume level when using the 5751 over the 12AX7.


Yup - that's right on.  And the slightly lower gain of the 5751 is a benefit for headphone use, no doubt.  If I were using it as a speaker amp, I'd probably stick with the 12AX7/ECC83.

post #36 of 144

most systems I have seen have too much gain to begin with.  lower gain means less attenuation, which is a good thing. this, of course, doesn't mean that 5751s are inherently superior to 12ax7.

 

post #37 of 144
Quote:
Originally Posted by Plink View Post

most systems I have seen have too much gain to begin with.  lower gain means less attenuation, which is a good thing. this, of course, doesn't mean that 5751s are inherently superior to 12ax7.

 


True, although IMHO the 5751 is generally superior.

post #38 of 144
Quote:
Originally Posted by Skylab View Post




True, although IMHO the 5751 is generally superior.


Which ones do you like?  I haven't tried many of the costlier 5751s and haven't had luck with cheap finds from my usual local sources.  I've had better luck finding 12AX7s.

post #39 of 144
Quote:
Originally Posted by Clayton SF View Post

I was going to wait until I received my Leben in case anything else out of the ordinary popped up. But judging from a little feedback from Skylab and some research it seems that the main difference between the 12AX7 and 5751 is that the latter tube has a little less gain (about 70% of the 12AX7) which would give one a little more control on a stepped attenuator. Meaning that you can use more steps on the attenuator to achieve the same increase in volume level when using the 5751 over the 12AX7.


Thanks.  I think 5751 we can buy new instead of NOS? right?

post #40 of 144
Quote:
Originally Posted by RedBull View Post

Thanks.  I think 5751 we can buy new instead of NOS? right?


Yes, you are right--you can get current production Sovtek 5751.

post #41 of 144
Quote:
Originally Posted by Plink View Post




Which ones do you like?  I haven't tried many of the costlier 5751s and haven't had luck with cheap finds from my usual local sources.  I've had better luck finding 12AX7s.


My favorite are the black plate Sylvania, the triple-mica JAN Hytron, and the windmill-getter Raytheon.  But even the grey plate Sylvania, which you can easily get NOS for a decent price, are very good.

post #42 of 144
Quote:
Originally Posted by Clayton SF View Post

 

Yes, you are right--you can get current production Sovtek 5751.


Thanks, apparently I got mine with GE 5751 already :)

post #43 of 144
Quote:
Originally Posted by RedBull View Post


Thanks, apparently I got mine with GE 5751 already :)


Yes, I have those as well but really can't compare them to the Sovteks because I swapped them out before I even turned on the amp for the first time.

post #44 of 144

Hey Clayton,

Did you get your CS300, yet?  You'll be happy you got yours local vs. grey market if any service ever needs done.

 

May I ask what Cans are you using?  The Leben matches with with my Grados, but wonder about trying something other.

 

my best

 

post #45 of 144
Quote:
Originally Posted by b2nyc View Post

Hey Clayton,

Did you get your CS300, yet?  You'll be happy you got yours local vs. grey market if any service ever needs done.

 

May I ask what Cans are you using?  The Leben matches with with my Grados, but wonder about trying something other.

 

my best

 

Hi b2nyc,

Yes I got my CS300XS. Very very nice. I do not own Grados (perhaps my next purchase--which model do you own?). The headphones that I've used on the Leben are the Beyerdynamic DT990 / 600 ohms and the Sennheiser HD650. If I were to choose between the two it would be the DT990. And although the HD650 sounds very good on the Leben, they are not as revealing as the DT990. I wish there was a headphone that had a sound signature that was between the 990 and the 650 because the 990, at times, can be a little brighter than I'd prefer.
 

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