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Schiit Lyr Tube Rollers - Page 102

post #1516 of 4256
Quote:
Originally Posted by Tequilasunriser View Post
 

Just run the unit with the stock tubes for a while. Don't get caught up in tube rolling right from the start.

 

Yeah, I will probably do that for the first three months and just enjoy the Lyr with the stock tubes.
 

Which one would you guys describe as warm sounding tubes?

post #1517 of 4256

My advise for your 1st tube rolling experiment with Lyr is to try some Amperex  orange globes or bugle boys. Tube Hunter aka Merecedes Man on Ebay always has them at fair prices.  If you can't hear any real difference from the stock GEs consider yourself lucky you will be saving a fortune in tube rolling .

post #1518 of 4256

To anyone who knows Amperex date codes... does the following sound right?

 

The date codes (faint gray print) stamped on the Bugle Boy Straight Man D getters:

 

One has...

GA2 (Tube Type + Change code; pretty sure GA = 6DJ8 or ECC88)

48C (Factory Year Month)

 

The other has...

<Don't see the TTC printed; the silkscreening is pretty much gone on this tube>
49G

 

Based on the info here:  www.audiotubes.com/mullcode.htm

 

it seems they are from March 1958 and July 1959, respectively, and are from the Venolanda S.A., Venezuela factory.  I need to double check the '4' since it can be printed in reverse, which would be a British factory.  Pretty sure both are straight up '4' though.

 

Assuming all that's correct, those tubes have had a fascinating journey:
Venezuela --> ?? --> Australia --> U.S.

 

If only those tubes could talk!  Well, as long as they can sing, I'm happy ;)

post #1519 of 4256

I know I saw another listing for codes but you can try to decipher this.  http://www.audiotubes.com/mullcode.htm

post #1520 of 4256
Quote:
Originally Posted by ThurstonX View Post
 

To anyone who knows Amperex date codes... does the following sound right?

 

The date codes (faint gray print) stamped on the Bugle Boy Straight Man D getters:

 

One has...

GA2 (Tube Type + Change code; pretty sure GA = 6DJ8 or ECC88)

48C (Factory Year Month)

 

The other has...

<Don't see the TTC printed; the silkscreening is pretty much gone on this tube>
49G

 

Based on the info here:  www.audiotubes.com/mullcode.htm

 

it seems they are from March 1958 and July 1959, respectively, and are from the Venolanda S.A., Venezuela factory.  I need to double check the '4' since it can be printed in reverse, which would be a British factory.  Pretty sure both are straight up '4' though.

 

Assuming all that's correct, those tubes have had a fascinating journey:
Venezuela --> ?? --> Australia --> U.S.

 

If only those tubes could talk!  Well, as long as they can sing, I'm happy ;)

 

That "4" is likely a Delta, which indicateds Heerlen, Holland. "8" is 1958 and "C" is March. And the other tube was manufactured in July, 1959, same factory.

 

http://tubedata.milbert.com/other/Philips/PhilipsCodeListAB-v10.pdf


Edited by gibosi - 3/20/14 at 8:53am
post #1521 of 4256
Quote:
Originally Posted by Tuco1965 View Post
 

I know I saw another listing for codes but you can try to decipher this.  http://www.audiotubes.com/mullcode.htm

 

Yep, I linked there ;)  If you find the other listing, please do post.  I usually start (and end) at Brent's page.

post #1522 of 4256
Quote:
Originally Posted by gibosi View Post
 

That "4" is likely a Delta, which indicateds Heerlen, Holland. "8" is 1958 and "C" is March. And the other tube was manufactured in July, 1959, same factory.

 

http://tubedata.milbert.com/other/Philips/PhilipsCodeListAB-v10.pdf

 

I'll compare to my other Amperex where the delta is plainly visible, and while I agree that Heerlen seems more likely (and preferable?), these sure looked like '4's.  Maybe my camera on macro can get a good shot of the codes.  I'll give it a try after they've had their DeoxIT soak.

 

Thanks for the link!

post #1523 of 4256

More info but still not the one I've seen before. http://www.tube-classics.de/TC/Tubes/Valvo/Phlipscode.htm

post #1524 of 4256
Quote:
Originally Posted by gibosi View Post
 

 

That "4" is likely a Delta, which indicateds Heerlen, Holland. "8" is 1958 and "C" is March. And the other tube was manufactured in July, 1959, same factory.

 

http://tubedata.milbert.com/other/Philips/PhilipsCodeListAB-v10.pdf

Good link!  

post #1525 of 4256
Quote:
Originally Posted by ThurstonX View Post
 

 

I'll compare to my other Amperex where the delta is plainly visible, and while I agree that Heerlen seems more likely (and preferable?), these sure looked like '4's.  Maybe my camera on macro can get a good shot of the codes.  I'll give it a try after they've had their DeoxIT soak.

 

My money's on Heerlen, Holland. :)

 

In the early 1950's, "4" was used as a factory symbol for one of the Eindhoven factories, and sometime later, Venolanda S.A, Venezuela. The ECC88 was first put into production by Amperex in 1958, and I do not believe they were ever manufactured in Eindhoven. However, I have some ECC40s (a miniature European version of the 6SN7GT), manufactured in 1955 at the Eindhoven #4 factory.

 

For late 1940's and early 1950's Philips tubes, this factory listing can be helpful:

 

 http://frank.pocnet.net/other/Philips/PhilipsCodeList.pdf

post #1526 of 4256
Quote:
Originally Posted by gibosi View Post

 

My money's on Heerlen, Holland. :)

 

In the early 1950's, "4" was used as a factory symbol for one of the Eindhoven factories, and sometime later, Venolanda S.A, Venezuela. The ECC88 was first put into production by Amperex in 1958, and I do not believe they were ever manufactured in Eindhoven. However, I have some ECC40s (a miniature European version of the 6SN7GT), manufactured in 1955 at the Eindhoven #4 factory.

 

For late 1940's and early 1950's Philips tubes, this factory listing can be helpful:

 

 http://frank.pocnet.net/other/Philips/PhilipsCodeList.pdf

 

Thanks again for sharing your knowledge and insights.  So these are early production ECC88s.  And no, I won't take that bet ;)  I'm sure you're right, but I'll still post the photos, if they turn out OK.

post #1527 of 4256

I'm also betting that Gibosi is correct...it's a delta, not a 4. My '59s have similar markings.

 

To quote Vicki Vallencourt..."that's what it's gonna be"

 

:beerchug:

post #1528 of 4256

Well my 1965 Bugle Boys arrived.  Time to put some hours on them now.

post #1529 of 4256
Quote:
Originally Posted by gibosi View Post

 

My money's on Heerlen, Holland. :)

 

I definitely agree that Heerlen is the likely source.

 

The ECC88 was first put into production by Amperex in 1958

 

Philips, if you please. :regular_smile :

 

and I do not believe they were ever manufactured in Eindhoven.

 

I'm not aware of any Eindhoven production either. Philips had their major research labs in Eindhoven, though. It is quite possible, even probable, that the research production lines of those reseach labs made some. Some of the Eindhoven "numbers" point to actual research labs. I'm not sure about number 4, though.

post #1530 of 4256

After I put a pair of reading glasses (so handy for soldering or sussing out mysterious date codes...;-) I was able to discern the delta symbol I'd mistaken for a 4.  See, that's why I didn't bet ;)  And yes, it is the most logical source.  Who knows if they even manufactured those tubes in Venezuela.  All moot.

 

They have a nice, detailed, airy sort of sound after a little warmup.  Not great low end compared to other tubes, though.  Curious if they'll break in more (no idea if they were NOS).

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