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SDS, Supra, MPX tuberolling, the new global, improved thread - Page 25

post #361 of 780

For the 5751 doubters

I rolled in a Raytheon 3MBP 5751 as a substitute for the 6414 as driver with 5687 outputs. It sounds better than the 6414 to me. Mellower, better detail. And still a lot of what i think is SLAM. I am playing My Morning Jacket's new concert CD and it sounds great.

The 5751 does NOT work as a driver with high voltage tubes as outputs!

I have some NOS-type 6SN7s coming (KenRad, Sylvania, RCA, Raytheon), and then I am done. I hope.

I hear Mikhail recently bought a wharehouse full of tubes!
post #362 of 780
Quote:
Originally Posted by Frihed89 View Post
I rolled in a Raytheon 3MBP 5751 as a substitute for the 6414 as driver with 5687 outputs. It sounds better than the 6414 to me. Mellower, better detail. And still a lot of what i think is SLAM. I am playing My Morning Jacket's new concert CD and it sounds great.

The 5751 does NOT work as a driver with high voltage tubes as outputs!

I have some NOS-type 6SN7s coming (KenRad, Sylvania, RCA, Raytheon), and then I am done. I hope.

I hear Mikhail recently bought a wharehouse full of tubes!
I would watch the 5751 with the 5687's too. In my SLAM SE the 6414 drives the 5687's hard enough the plates turn red. My low bias setting is likely different so there may be no concern. I would just not leave the amp unattended until I was sure.

Glad you like the 5751 in your amp .... that seems to be your tube.
post #363 of 780

5687s not on fire yet

Thanks Earl. The plates - you mean the whole top plate gets red? Right now, there are two thin wires that are red.

Do I have a different bias arrangement than your MPX3 SLAM SE? I have the Supra power option and high bias option (That's what Mikhail wrote).

Actually, I do like the 6414/5687 and 5751/5687 combos.
post #364 of 780
Quote:
Originally Posted by Frihed89 View Post
Thanks Earl. The plates - you mean the whole top plate gets red? Right now, there are two thin wires that are red.

Do I have a different bias arrangement than your MPX3 SLAM SE? I have the Supra power option and high bias option (That's what Mikhail wrote).

Actually, I do like the 6414/5687 and 5751/5687 combos.
The plates are the 2 large vertical metallic structures you see in the tube.

Currently the 2 glowing 'wires' you see are the filaments (heaters), which glow red/yellow no matter what.
post #365 of 780
Quote:
Originally Posted by Frihed89 View Post
Thanks Earl. The plates - you mean the whole top plate gets red? Right now, there are two thin wires that are red.

Do I have a different bias arrangement than your MPX3 SLAM SE? I have the Supra power option and high bias option (That's what Mikhail wrote).

Actually, I do like the 6414/5687 and 5751/5687 combos.
I mean the two metal plates. If you see the plates turning cherry red you are driving the tubes to hard. The two thin wires are just the filaments and they are supposed to glow orange/ red. I figured you would be ok but I wanted to mention this since it did occur with my amp. 5687's work fine in my amp I just need to use a lower gain tube like the 6sn7/7n7 with the these tubes to prevent overdriving them.

Yes you would have a different bias setting. I have a manual bias switch I special ordered that gives me four different bias settings .... and my lowest bias setting is higher than the nominal setting he does with the standard amps.

Of the 6414 series of tubes the one I really like is the RCA 12AV7. You might like this one too. In Europe you should be able to get the Amperex, Philips or Mullard 7062/ E180CC which are excellent tubes and use the same ECC adapter.
post #366 of 780
Quote:
Originally Posted by sacd lover View Post
Yes you would have a different bias setting. I have a manual bias switch I special ordered that gives me four different bias settings .... and my lowest bias setting is higher than the nominal setting he does with the standard amps.
Schweeeeeet!
post #367 of 780

Nothing is red yet

Ok. Neither the vertical black plates or the horizontal ones are red on any of the three and they have been playing 6 hours straight +. I was going to stay away from the 12AX7s, but hadn't thought about the 12AU7s or the 12AV7s. The 5751 is lower gain than the 12A--7 series. The EC/ECC tubes are all I can get over here. It's a real pain in the ass.
post #368 of 780

Other older 5751s also sound good

I guess i have found my sound for now: the RCA TMBP 5751 driving the 5687s. I am getting several NOS 6SN7s in a while and I will play with these, too.

So far the two best combinations I have found for my ears and music are:
5751 + 2 X 5687, and 7N7 + 2 X 6BL7GTAs at high power.

I plan to try the various 6SN7s as the driver with both sets of output tubes (i.e., 5687 and 6BL7s) and then, because I have some matched 6SN7s, I will try these in the outputs and experiment with input tubes, including the 6414, at the low power setting for the output tubes (6SN7s).

I tried the 5751 with the 2 X 6BL7GTAs at high power and it did not work!

I am not buying any more tubes for a while. I have enough to play with, considering how much I like the unlikely combination I do.
post #369 of 780

ECC182 (7119) vs E82CC (12AU7)

These two tubes are relatively plentiful in the EU and both use the same adaptor.

What are the technical differences between the two?
How does this translate into sonic differences?
Which brands/types do you prefer and why?
Any price sleepers?

I have a MPX3 SLAM SE

Glædelig jul og godt nytår

Greetings from the warm and sunny Brønshøj Riveria on the banks of the lovely Utterslev Mose,

John
post #370 of 780
Quote:
Originally Posted by Frihed89 View Post
These two tubes are relatively plentiful in the EU and both use the same adaptor.

What are the technical differences between the two?
How does this translate into sonic differences?
Which brands/types do you prefer and why?
Any price sleepers?

I have a MPX3 SLAM SE

Glædelig jul og godt nytår

Greetings from the warm and sunny Brønshøj Riveria on the banks of the lovely Utterslev Mose,

John
I sent you a pm. Just so no one gets confused .... the 7119 and 12au7 DO NOT use the same adapter. The 7119 is a 5687 variant and uses the 5687 adapter.
post #371 of 780
I'm wondering how many folks have tried the 2C51 tube (needs the associated adapter) in the gain position. I have tried both a Bendix tube and a Sylvania 2C51 tube, and have been listening for several evenings now, and I am blown away by the sound this provides with the 5687 in the outputs. I really liked the 12AU7 in the gain position with the 5687's or the 7119's in the output, and frankly thought the sound to my ears could not get much better, but the 2C51 in the gain is actually a not insignificant improvement. If you haven't tried the 2C51 one yet, you really should think about it. With the K701's, it's an awesome combination.
post #372 of 780
Quote:
Originally Posted by PhilS View Post
I'm wondering how many folks have tried the 2C51 tube (needs the associated adapter) in the gain position. I have tried both a Bendix tube and a Sylvania 2C51 tube, and have been listening for several evenings now, and I am blown away by the sound this provides with the 5687 in the outputs. I really liked the 12AU7 in the gain position with the 5687's or the 7119's in the output, and frankly thought the sound to my ears could not get much better, but the 2C51 in the gain is actually a not insignificant improvement. If you haven't tried the 2C51 one yet, you really should think about it. With the K701's, it's an awesome combination.

My 2c51 adapter is stuck at the Denver post office. Hopefully, it shows up sometime next week. I have several rare tung sol 2c51's ... and one tung sol 5670 to try out .... cant wait.
post #373 of 780
2C51 tube - which adaptor? It's not on my list.
post #374 of 780
Quote:
Originally Posted by Frihed89 View Post
2C51 tube - which adaptor? It's not on my list.
The 2c51 has its own adapter. This adapter also can use the 5670 and the Western Electric 396A .... for starters.
post #375 of 780
Quote:
Originally Posted by sacd lover View Post
The 2c51 has its own adapter. This adapter also can use the 5670 and the Western Electric 396A .... for starters.
Earl, what is the difference between the 2C51, the 5670, and the 396A. Are these just different designations for the exact same tube from different manufacturers, or is there some other difference?
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