Hi, I've tried to find out using google, but I didn't got any convincing answers there. The thing is that I've just found some old vacuum tubes, EC83 and EC82 (didn't remember the fabricate but it doesn't matter anyway). And if I'm right the EC83 is the same tube as the 12ax7 and the EC82 is the same as 12au7. Or not?

Don't know much about how tubes are named and so but I can't understand the point with having two part names for the same tube. So is there anything thing else that differs, or is EC83 just the same tube as 12ax7?

I made a perfboard layout for the Marshall Lead 12 preamp last night, so I thought I'll post it here if anyone might found it useful. In the original schematic the supply voltage was +/-16, but I added two zener diodes and resistors
to make it possible to run the preamp at +/-35 V (yes the it will only be 15 V after the zener but it should work). I also decided to use the original wiring for the input jacks, which I found hard to draw in DIYLC, so look at the original schematic to figure it out.

I find it really hard to draw a satisfying layout by hand, so please tell me what you think about my layout so I can do better next time.

Hi, I'm thinking of a way to use two guitars in the same amp. Of course a simple 2 mono to 1 mono cable splitter can be use, there are some donwsides with this solution I've heard though. Sometimes some tones from one of guitarist totaly takes over the signal and playing with heavy distortion may also sound weird then a Y-cable is used.

But why not use a simple mixer cicrcuit like "Mini-Mixer" at generalguitargadgets.com? A better solution in my opinion, coluden't siounds worse than the Y-cable solution anyway. However I don't know if it will solve the problems mention before, I'll have to try I guess.

So, have anyone else done something similiar and want to share their experience before I start maybe? If there's a better mixer-circuit for guitar, please post.