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Schiit Lyr - The tube rolling thread - Page 264  

post #3946 of 8735

Also, has anyone with the GE 6BZ7s noticed a very faint high pitch noise being made that can be heard when no music is playing?  It doesn't change loudness along with the volume control; it's just a constant noise.  I do not notice this with the JJ's.  I've noticed this with all headphones I've tried.

 

Edit: I think these tubes may have gone microphonic.  Even a very faint tap on either of them sends a noise into the headphones.  It's either just a trait of these tubes, or they are defective.


Edited by jsplice - 8/22/12 at 9:40am
post #3947 of 8735
Quote:
Originally Posted by jsplice View Post

Also, has anyone with the GE 6BZ7s noticed a very faint high pitch noise being made that can be heard when no music is playing?  It doesn't change loudness along with the volume control; it's just a constant noise.  I do not notice this with the JJ's.  I've noticed this with all headphones I've tried.

 

Edit: I think these tubes may have gone microphonic.  Even a very faint tap on either of them sends a noise into the headphones.  It's either just a trait of these tubes, or they are defective.

 

If you tap the JJ's you'll hear it as well. Try reseating the GE's, they may also very well be microphonic as they are NOS tubes
post #3948 of 8735

After days of listening to many different cd's on the Telefunken E288cc's, I can safely say that my days of tube-rolling on the Lyr are over. These tubes are the "end game" for this particular amp. Chilling clarity and detail, with a warmth that would make Mullard fans weep tears of joy. I liked the Lyr from the beginning, but there was always something missing from it that I couldn't quite put my finger on, until I listened to the E288cc's. With these tubes, I was able to hear details that had been glossed over previously. Yet, it didn't come at the cost of sounding dry or analytical. Indeed, vocals sound luscious, and electric guitar sounds positively sinful on the Telefunkens. From bass all the way to treble, it's smooth and balanced. Absolutely dead silent where it should be, too. Now, I just need to save my money for more pairs of them!

post #3949 of 8735

I know this might sound daft but how far should you be able to push the tubes in? Does the bottom of the tube need to be flush with the bit you insert it into as I've got quite a bit of the pins still showing?

post #3950 of 8735

Push it all the way in.

 

#TWSS

post #3951 of 8735
Quote:
Originally Posted by sridhar3 View Post

Push it all the way in.

 

#TWSS

This is described as in correct.  Meaning, when it's in, in tight, and all the way in, it's in correct.evil_smiley.gif

post #3952 of 8735
Quote:
Originally Posted by kskwerl View Post

 

If you tap the JJ's you'll hear it as well. Try reseating the GE's, they may also very well be microphonic as they are NOS tubes

All tubes, when excited by an outside source, will display signs of microphonics.  Also known as "tube ringing".

post #3953 of 8735
Quote:
Originally Posted by Rope View Post

All tubes, when excited by an outside source, will display signs of microphonics.  Also known as "tube ringing".

 

Right, but some tubes are more sensitive than others.  I know when purchasing tubes from Upscale Audio, you can choose "platinum grade", which are supposed to be the ones tested by him to have the lowest levels of microphonics.  I'd be curious to know what actually causes tubes to "go microphonic", i.e. is it just when they get older, if they get jostled too hard, etc.

post #3954 of 8735

jsplice -

 

I don't have an answer for a tube becoming microphonic after a period of time, but I suspect (conjecture) it would have something to do with the tubes internals becoming heated an cooled many times.

 

The point I am trying to establish is the fact that any tube regardless of testing for low microphonics, will become microphonic by tapping (very lightly) the tubes bottle.  I don't recommend doing this while the tube is extremely hot, but if you put your phones on and tap the bottle lightly, you'll hear what is referred to as "tube ringing".  Some tubes will "ring" in the process of warming up.

post #3955 of 8735
Quote:
Originally Posted by Rope View Post

jsplice -

 

I don't have an answer for a tube becoming microphonic after a period of time, but I suspect (conjecture) it would have something to do with the tubes internals becoming heated an cooled many times.

 

The point I am trying to establish is the fact that any tube regardless of testing for low microphonics, will become microphonic by tapping (very lightly) the tubes bottle.  I don't recommend doing this while the tube is extremely hot, but if you put your phones on and tap the bottle lightly, you'll hear what is referred to as "tube ringing".  Some tubes will "ring" in the process of warming up.

 

I do agree with your point.  But the reason I bring this up is because I believe the high level of microphonics in my GE tubes is the culprit for the high pitched noise I can hear coming through my headphones.  My guess is that the tubes are picking up nearby electrical noise and transmitting them through the headphones.  I do not notice this with my JJ tubes, and a tap on the JJ tubes produces a much much quieter noise than with the GEs.  I'm sure there are several reasons for always wanting to use tubes with the lowest microphonics, particularly with components such as preamps and input sections of integrated amplifiers, as they are working with very low input signals and can be more susceptible to noise.

post #3956 of 8735

Quote:

Originally Posted by dailydoseofdaly View Post

It's cool man, no hurry. That's a really good deal if you got both pair for 10 bucks

 

GE 6BQ7A NOS Gray Plate/$3.95 per tube (Tube Depot), 05-27-2011. RCA 6GU7 NOS Black Plate/$4.00 per tube (Deep Surplus) 07-07-2011

 

The GE's are definitely bigger in the low frequency department, in fact, they're bigger all the way around.  Keep in mind that mileage varies depending on your rig.

I employed HE-500/SB Touch/WMA lossless media/Bifrost/Lyr. 


Edited by Rope - 8/22/12 at 7:21pm
post #3957 of 8735
Quote:
Originally Posted by jsplice View Post

 

I do agree with your point.  But the reason I bring this up is because I believe the high level of microphonics in my GE tubes is the culprit for the high pitched noise I can hear coming through my headphones.  My guess is that the tubes are picking up nearby electrical noise and transmitting them through the headphones.  I do not notice this with my JJ tubes, and a tap on the JJ tubes produces a much much quieter noise than with the GEs.  I'm sure there are several reasons for always wanting to use tubes with the lowest microphonics, particularly with components such as preamps and input sections of integrated amplifiers, as they are working with very low input signals and can be more susceptible to noise.

 Granted, some tubes are definitely more microphonic and care needs to be taken to procure tubes that have very low microphonics when dealing with the Lyr.  I've had (past tense) tubes that would sing their own song at particular fequencies, yet at other frequencies, quiet as a mouse.

post #3958 of 8735

Selling 1 x pairs of Lorenz Suttgard PCC88's, squat with gray shields (light use) and a spare

 

Purchased from MrRogers via Kremer930.

 

Send me a PM if you are interested


Edited by W0lfd0g - 8/23/12 at 6:49am
post #3959 of 8735
Quote:
Originally Posted by W0lfd0g View Post

Selling 2 x pairs of Lorenz Suttgard PCC88's, squat with gray shields (light use). 

 

Purchased from MrRogers via Kremer930.

 

 

One pair is perfect (let's call them the "A-Team").

 

The other is not (let's call them the "B-Team").  Kremer930 states that one of the getters in one of the tubes in the second pair became dislodged in transit.  It might still work when the getter is made to sit on the side and not in contact with the circuit (but I haven't tested).  The second tube in this set is fine and, alternatively, could be used as a spare. 

 

EDIT:

 

Send me a PM listing which pair you want (A-Team, B-Team or both), a brief, over-the-top explanation (50 words or less) as to why you want them and the amount of your offer.  The tubes will be sold to the Headfier who I judge to have the most entertaining explanation and who has a competitive (but not necessarily the highest) offer. 

 

Here is a pitiful example of my own: "These tubes would fill a vacuum in my life and give me a warm glow"

 

I will post a list of some of the top comments (but not amounts offered) in this thread.  Please let me know if you are willing for your contribution to be included and, if so, whether you want it to be anonymous or not. 

 

All in fun. 

 

No specified closing date, just when I have enough responses, so beat the rush. 

 

Thanks everyone.  beerchug.gif popcorn.gif

No offense, but this is cheap. 

post #3960 of 8735

No offense meant or taken.  I am sorry, you are probably right.  I will take it down.   The tubes are still for sale though. 
 

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