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Schiit Lyr - The tube rolling thread - Page 492  

post #7366 of 8735
Quote:
Originally Posted by PinkLed View Post

I will second this. One time I tried to build a old vintage guitar effects pedal used by Pete Townshend (Univox Superfuzz), that cost just as much as a Lyr but failed miserably. 

This is already north of $1K

 

 

I promise to do a good job documenting the process with lots of pictures.


Edited by sceleratus - 5/21/13 at 5:45pm
post #7367 of 8735
Quote:
Originally Posted by sceleratus View Post

Kinda like This One?

Yeah...kinda like that one. tongue.gif

 

Cheers!beerchug.gif

-HK sends

post #7368 of 8735
Quote:
Originally Posted by HK_sends View Post

Some clarification from our friends at TubeMonger on the tubes we were talking about earlier.  I wasn't aware of this:

"http://www.ebay.com/itm/VERY-RARE-NEW-TUBE-E188CC-7441-RTC-MORE-AVAILABLE-/121103171111?pt=Vintage_Electronics_R2&hash=item1c324fbe27




FYI, of the code indeed says VR7 F3K2 - these would be the original La-Radiotechnique, Suresnes Plant, French production tubes. This was another of the Philips associates and a fine maker of tubes. These are 1970s E188CC tubes like all other Revision 7 tubes from Philips Plants.




Tilted getter does not mean anything (sonically, technically or otherwise). Getter is simply used for evacuation process.




Here is some info about evacuation process and getter from the net


http://tubesound.com/wp-content/uploads/2008/09/flashing.gif
"

And a listing of Philips Tube Codes...



philipstubecodes.pdf 59k .pdf file



So, I wasn't aware of these before so I can't say how good they are in comparison to the Holland or British made RTCs.
Might actually be worth a try...

Cheers!beerchug.gif

-HK sends

Dammit you guys . . . another $180 down the tubes (no pun). And I SWORE an oath "no more 6DJ8 tubes; only Octals from now on". That oath didn't last a day :-)
post #7369 of 8735
Quote:
Originally Posted by R Scott Ireland View Post

Dammit you guys . . . another $180 down the tubes (no pun). And I SWORE an oath "no more 6DJ8 tubes; only Octals from now on". That oath didn't last a day :-)

PS - I'll let you know how they compare to the Heerlen and Mullard RTC's after they get here and I can compare.
post #7370 of 8735
Quote:
Originally Posted by R Scott Ireland View Post


Dammit you guys . . . another $180 down the tubes (no pun). And I SWORE an oath "no more 6DJ8 tubes; only Octals from now on". That oath didn't last a day :-)

Glad we could be of help!wink_face.gif

 

Cheers!beerchug.gif

-HK sends

post #7371 of 8735
Quote:
Originally Posted by HK_sends View Post

Glad we could be of help!wink_face.gif


Cheers!beerchug.gif

-HK sends

Yes, thanks!!! smily_headphones1.gif
post #7372 of 8735
Quote:
Originally Posted by john57 View Post

 The tube that works well with the Lyr is the GE 6DJ8 smoked glass. The darker the better especially the getter. These were the tubes during my Counterpoint days and have not been used in 20 years. Comparing the 6DJ8 smoke glass tube to the GE 6BZ7 I find that the 6BZ7 sounds very much like Dolby compression set for Quiet environment on my theater setup. The GE 6DJ8 smoked glass is much more dynamic for the music that I listen to which has a very wide dynamic range to begin with. The 6DJ8 has a bit more brilliance and great front to back sound-stage. No question that the GE 6Dj8 is going to be one of my favorite tubes to use in the Lyr and originally those tubes were the backups for my Melos gold pre-amp. The good news is that EBay has plenty of these tubes available and not terribly expensive either. The smoked glass acts like a light RF shield and prevents some stray electrons from bouncing off the inside glass of the tube. I do not call the GE smoked glass grey glass because grey glass tubes like some of my 6SN7 types are not transparent like the GE and I have other tubes that have black glass with no light seen except for the very top of the tube.  I do find that the Lyr has good sensitivity to the various qualities of different tubes.

It's about time someone mentioned the Smokies. They are my personal favorite for well recorded vocals with the Lyr(HE-500 phones). 

post #7373 of 8735
Quote:
Originally Posted by john57 View Post

 

I have the Sencore T28 myself and have rebuilt it to factory specs. I had great tubes that unexpectedly failed before its time that are hard to find. I am waiting on delivery of the GE smoked glass backup tubes since I am now planning on to keep the Lyr for the long haul. Prices on NOS tubes are not getting cheaper and the GE happens to be good value for the money.


Good call - get'em while you can.  The Sencor, although not a mutual conductance tester, is very good for an emissions tester.  It has served me well for many years.  Those Hancoks are way to expensive for occasional use.  Since almost every piece of audio gear I have has some kind of tube in it, it was well worth the $150 I paid for it.


Edited by rb2013 - 5/22/13 at 7:15am
post #7374 of 8735

I even built the calibration module for my Sencore T28. If money was no object I would get the Sencore MU150 Continental but I would rebuilt it if it has not been done in order to have any accuracy in the meter readings.

 

post #7375 of 8735
Quote:
Originally Posted by john57 View Post

I even built the calibration module for my Sencore T28. If money was no object I would get the Sencore MU150 Continental but I would rebuilt it if it has not been done in order to have any accuracy in the meter readings.

 


Having a calibration module is a great idea.  How much did it cost to build?  I had mine calibrated by a friend when I got it, but it's been a while.  The MC testers are more sensitive to calb, especially the older ones.  From what I heard the modern emission testers are less prone to drift.

post #7376 of 8735
Quote:
Originally Posted by rb2013 View Post


Thanks for the info - that'll come in handy.  I'll be looking to upgrade the caps in time - to bad I missed the Empirical Audio Lyr that sold a few months ago - nice upgrades across the board!  Saved the list of upgrades - I'll at least swap out the Wimas for some V-Caps or some AuraTeflons.  The Ad on these forums didn't state which they used - anyone have an idea?  They did state they added a high-voltage Black-Gate 'lytic' for plate voltage - 22uFd, 350VDC  and 4 Panasonic low-ESR 'lytics' to replce the inexpensive low voltage decoupling caps.

 

Someone got a real bargain - the hot roddiest Lyr out there I'm sure!!!

Did you see this thead

http://www.head-fi.org/t/649183/some-schiit-lyr-mods#post_9119326

 

He made the Teflon caps himself.

post #7377 of 8735
Quote:
Originally Posted by john57 View Post

I even built the calibration module for my Sencore T28. If money was no object I would get the Sencore MU150 Continental but I would rebuilt it if it has not been done in order to have any accuracy in the meter readings.

 


One of the reasons I like the Sencor Mighty Mites:

 

From tubesound blog:  http://tubesound.com/2007/10/24/sencore-mighty-mite/

 

"The super-sensitive grid leakage test is probably the best attribute of a Mighty Mite.  As the electron emitting material of cathode is worn away from age, some of the cathode material that has evaporated gets deposited on the grid.  This causes the grid to incorrectly emit electrons – “grid emission”.  This causes the grid to draw current and be more positive than it should be, thereby negatively affecting the circuit."

 

In some of my monster KT-88 amps (ASL Hurricanes 8 - KT-88s per mono block), leaky tubes would blow resistors, this feature saved me a lot of headaches!

post #7378 of 8735
Quote:
Originally Posted by randytsuch View Post

Did you see this thead

http://www.head-fi.org/t/649183/some-schiit-lyr-mods#post_9119326

 

He made the Teflon caps himself.


Thanks randytsuch!  I looked for and hoping to find this post!!  Made the Teflon caps himself - Uggg!  That's way over my head.  Hey lucky guy who bought that Lyr, any interest in selling it for a nice profit???

post #7379 of 8735
Quote:
Originally Posted by randytsuch View Post

Did you see this thead

http://www.head-fi.org/t/649183/some-schiit-lyr-mods#post_9119326

 

He made the Teflon caps himself.


Just read the whole post - I guess there are Teflon V-Caps that will fit.  Good News!  that's an easy one.  As are the Wima cap upgrades.  He leaves no stone unturned!  Love the idea of cutting the traces and using silver wire to the input RCAs.   Great advice on the fuses!  Well the Seimens CCa grays are so damn expensive and in my various amps and DACs that use the 6922, I had really good luck with the Voshkod 6n23 rockets (saucer getters) and sold all my CCas.    The rockets were so close in sound at a fraction of the cost, low noise, never had any microphonics, and damn near bulletproof. 

 

My Lyr is coming today.  After the customary 200 hr burn-in, I'll see how they sound there.

post #7380 of 8735

He said:

 I used a custom teflon cap that I had made for my older tubeDAC, but you can use Mundorf, V-Caps or others. I recommend a teflon cap with tin film or copper film. Avoid plated Mylar.

 

I would just use a V Cap or Mundorf caps.  I have a pair of Ampohm caps that are no longer in use, which should work here, as long as they fit.  I plan to try them one of these days.

 

Randy

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