Tube Rolling w/Crack

[attmci]

Yeah. It shows how subjective this stuff can be sometimes. It also may expose the limitations of my gear.

Thanks for sharing.  I believe you received one of the first batches of crack.

[MaymunBaba]

Noob warning.

Equipment is HD650+Crack(no upgrades)

I was planning to purchase Genalex Gold Lion ECC82, I see 2 versions (regular vs platinum) on eBay, with the following description. I was wondering the difference (hig/low gain), planning to pair with "Svetlana Winged C 6H13C = 6AS7G Vacuum Tubes Black Plates".
Thanks!

GENALEX New PAIR Platinum Matched Gold Lion NIB 12AU7 ECC82 B749 Tubes Gold Pin
From description: It is a high gain, low noise valve with a short plate structure for reduced microphonics. Excellent for use in the highest quality audio amplifiers/pre-amplifiers.

GENALEX New PAIR TWO Gold Lion NIB 12AU7 ECC82 B749 Tubes Gold Pin
From description: It is a medium gain, low noise valve with a short plate structure for reduced microphonics. Excellent for use in the highest quality audio amplifiers/pre-amplifiers.

[Doc B.]

A 12AU7 is a medium gain tube. That high gain comment has to be either a misprint or misrepresentation of the tube as a 12AU7. Most likely it's a misprint, as the platinum thing seems to mean they are somehow "matched" but not any different in spec from the non-platinum version.

[Francisco]

Hi, i got a cheap 12au7, which has Amperex written, but i cannot identify the rest. I was wondering if anybody recognize the tube by the plates? On a side there is 12au7a USA written.

(https://forum.bottlehead.com/proxy.php?request=http%3A%2F%2Fi1213.photobucket.com%2Falbums%2Fcc479%2Furecheus%2FIMG_0468.jpg%7Eoriginal&hash=d1ed07314a7836fa47930da946a5a883801a3f01)

[fullheadofnothing]

Since it says USA, it's a re-branding of something (probably GE). Showing those other markings would be helpful .

[Francisco]

The one on the left is the one marked Amperex, and the one on the right is supposed to be made by Mullard.

(https://forum.bottlehead.com/proxy.php?request=http%3A%2F%2Fi1213.photobucket.com%2Falbums%2Fcc479%2Furecheus%2Fs-l1600.jpg%7Eoriginal&hash=1624d7ca2d2d9942bd72445e606ab6647a673aff)

[fullheadofnothing]

Left is definitely GE.

Right could be a Mullard. Easiest spotting of a a Mullard is if the heater flashes very bright briefly when it's turned on.

[Paul Birkeland]

There's a decent amount that can be discerned by looking at the top of the glass.  European tubes will usually have 2 or 4 seams in the glass, while American tubes will have none.  Some German tubes will also have no seams, but the shape of the top of those tubes will be very straight and well formed, while the American tubes won't look nearly as neat. 

[Francisco]

It seams it is a Mullard, nice flash on power on ))).

[teamrushpntball]

Quick question for everyone, I picked up a Philips Miniwatt E80CC and think something is faulty.  I was under the impression the gain was higher with these than standard EC82 tubes.  Mine is incredibly quiet unless my volume is near maxed out.  Is this normal?

[attmci]

The one on the left is the one marked Amperex, and the one on the right is supposed to be made by Mullard.

(https://forum.bottlehead.com/proxy.php?request=http%3A%2F%2Fi1213.photobucket.com%2Falbums%2Fcc479%2Furecheus%2Fs-l1600.jpg%7Eoriginal&hash=1624d7ca2d2d9942bd72445e606ab6647a673aff)

Agree the left is a GE (with GE dots near the bottom).

Any code on the right tube?

[Francisco]

The other i believe it is a Mullard, it flashes on power on.

Other markings:

(https://forum.bottlehead.com/proxy.php?request=http%3A%2F%2Fi1213.photobucket.com%2Falbums%2Fcc479%2Furecheus%2Fs-l1601.jpg&hash=fc091ea8b7ae11e521277b2d91144a7de146c0da)
(https://forum.bottlehead.com/proxy.php?request=http%3A%2F%2Fi1213.photobucket.com%2Falbums%2Fcc479%2Furecheus%2Fs-l1602.jpg&hash=b4ea9f81f85dcb10020ec2cc5ecd961941bd6347)

[ChrisP]

Hey fellas,
I'm running the Svetlana 6H13C winged C + Gold Lion 12AU7 and I'm loving the slam it gives music. Definitely makes it more exciting.

But I'm looking for a tube that mellows out music as the aforementioned combo can make it sound harsh. So I'm looking for something that gives that liquidy tube sound. I hear the Mullard CV4003 counteracts the power the Winged C gives. Would one be a good choice?

Anyone who's had both the Gold Lion and Mullard that can give any inputs?

I also have the Mullard 12AU7/ECC82 which I'm liking with the Winged C as it's not as harsh as the Gold Lion.

[attmci]

The other i believe it is a Mullard, it flashes on power on.

Other markings:

(https://forum.bottlehead.com/proxy.php?request=http%3A%2F%2Fi1213.photobucket.com%2Falbums%2Fcc479%2Furecheus%2Fs-l1601.jpg&hash=fc091ea8b7ae11e521277b2d91144a7de146c0da)
(https://forum.bottlehead.com/proxy.php?request=http%3A%2F%2Fi1213.photobucket.com%2Falbums%2Fcc479%2Furecheus%2Fs-l1602.jpg&hash=b4ea9f81f85dcb10020ec2cc5ecd961941bd6347)

Like this one (take a look of the code at the bottom of the tube shown in one of the picture)? http://www.ebay.com/itm/1-tube-Mullard-12AU7-ECC82-ECC802S-72-87-/112326325956?hash=item1a272bb6c4:g:slQAAOSw4CFYvd3p

BTW, many EU valve has this "Mullard flash" including the famous 7316.

[Paul Birkeland]

Quick question for everyone, I picked up a Philips Miniwatt E80CC and think something is faulty.  I was under the impression the gain was higher with these than standard EC82 tubes.  Mine is incredibly quiet unless my volume is near maxed out.  Is this normal?

You'll get 1-2dB of additional gain with an E80CC assuming that you're using the Speedball (and that you've adjusted the R1 resistors accordingly).