RM100 tube chart?

[Ulvo]

Is there a tube chart for the RM100 somewhere? Or could somone tell me which 12ax7 is for the first amp stage, which one is for the loop and which one is for the phase inverter?

 

[Smokey]

Looking from the back of the amp.
- The one closest to the front panel on the right hand side (just behind the guitar input) is V1
- The next tube to the left of that is for the Effects Loop
- The tube closest to the Power tubes is the Phase inverter
Cheers

 

[Soulinsane]

Looking from the back of the amp.
- The one closest to the front panel on the right hand side (just behind the guitar input) is V1
- The next tube to the left of that is for the Effects Loop
- The tube closest to the Power tubes is the Phase inverter
Cheers

I can back this up too.

 

[TheHunter]

What will changing the phase inverter do for the sound of the amp?

In V1 on the chassis is this not the common tube that all the modules utilize as a third tube in the series. So changing this will dramaticaly change the tone of the overall amp as well right?

Changing V2 (effects loop tube) will have little to no effect on the amp tone so much as what goes into the loop, am i right on this?

Im trying to understand this as i am about to change these tubes out and would like to know what affects on my amp they will produce.

 

[Ulvo]

Thank you, Smokey and Soulinsane.

The Hunter: Yes, it's true that V1 is a common tube for all the channels. It's probably used for the first and the last amp-stage. Some say that the first tube-stage is the single tube that will have the most impact on tone. So, if you're gonna buy just one really expencive NOS-tube that has that sweet sound to it, it would make sense to put it in V1.

However, I'm not really into the NOS-tube thingy. The reason for me to know, is simply that I'd like to put a high-gain 12ax7 in V1 to make it less prone ti microphonics.

The phase inverter tube location is simply about putting one oft hose balanced 12ax7's from Eurotubes in there. I really don't know if there's any benefit at all from doing this, but i sure won't hurt. If anyone know a good reason for using a "balanced" tube in this spot, please enlighten me.

For the loop-driver I was thinking about using a 12at7 or 12au7, because of the better driving capabilities, but I really don't know if that would be necessary either.

 

[Soulinsane]

I just finished proofing out the schematics for the RM100 a few days ago along with the Ultra XL, SL+, and Clean modules. V1 ( the input tube on the RM100 ) only uses one side of the tube ( pins 6, 7 and 8, grid to anode ) while the other side ( pins 1, 2, and 3 ) are all connected directly to ground and are completely dead. The signal then travels though the modules and into the loop buffer tube. The signal flows grid ( pin 2 ) to cathode ( pin 3 ) and into the grid ( pin 7 ) and out the anode ( pin 6 )no matter if effects are used between or not. The signal travels through the volume control and to both V3 phase inverter tube grids and out both anodes to the power tubes.

I see no reason why good tubes should not be used in V1, V2, and V3 as the signal passes through them all, with or without effects. They are common tubes for every channel. If there were any place to use a balanced matched tube it would be the V3 as each half drives equal halves of a matched bias set of power tubes. Like you said, it really can hurt anything and it might just sound better too.