Fine, I was looking for a solution and I posted a question for that in another topic related to the 18w.

Sure I'll try it. Only a question:

1)both the send are mixed in the effect input
2)I use a single channel (ch1 or ch2)
3)only the ef86 receive a return....

 is the effect in the chain when I use the top boost channel?

I should like to add a passive effect loop on my TMB ef86.

How to use a single effect chain for both the channels? Is it possible?

The VVR seems to be much more flexible and the general opinion about it (both London Power and Hallamp) is great.

I'll go in that direction.... with the help of a nice builder friend of mine.

I'm not skilled at all on tube amps  and so on..... I'm an user only so, I've another stupid question: is the 18W a fixed bias or a cathode biased amp?

Many thanks

I own a 18 watt tmb ef86 and I should like to have the tone at lower output level.

Apologizing in advance for the stupid questions......

1) what is a VVR??

2) I've seen the half power mod for a couple of EL34.... there's no a similar thing for a couple of EL84?

Thanks