Originally Posted by TrollDragon
Nice very nice!
The journey down the rabbit hole has only just begun.
What gain are you running the amplifier at? They come default at 3, it wasn't until I switched mine to 5 before it started to really open up. The 10 setting got too loud too fast, so I switched mine back to 5 and that's where it has been ever since.
Something else you might want to play with because it does change the sound. I like my volume control between 10 and 11 o'clock for a really nice listening level and that's with 5 gives me.
I haven't tried changing the gain yet. I'm at about 10 O'Clock with my HD 600s which seemed reasonable and with four sets of drivers and two sets of power tubes I had enough variables to play with. I don't think I'll ever go back to the stock power tubes (not because they were terrible, but I don't feel any need to do that experiment any more), and I'm down to a choice between the Mullards and 6HM5s for pole position in the driver's seat - with the Voskhods taking the wheel for the occasional special circumstance (basically, if I fancy a bit of a change...). Now I think could be a good time to explore the gain switches.
It's kind of funny that the plan was to play with the switches first, and then try the tubes as and when they arrived....but they all arrived within a day or two of ordering except for the ones which I paid for delivery, and came from just a few miles away. Next day delivery from Serbia to the UK was free!
Thanks for the help, assistance and advice.
A quick question for the experts - I read somewhere that part of the tube burn-in process was getting them hot enough to activate the scavenging coating on the inside of the tube to collect up the last few molecules of non-vacuum. The last time I used the Mullards I ran them for about 8 hours so they were good and hot, but they sounded pretty rough. The next time I use them, they sound smoother than a very smooth thing. Could the burn in have continued after I stopped listening, or does there actually have to be an audio signal going through them.?