Originally Posted by Frihed89
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.