ok good idea, I have another great idea for you, for example the 20/20 are two monoblock amps inside the same chassis, they only share the power supply so you could mix some tubes for every monoblock amp, for example my 20/20 has the left channel phase splitter a 5751, and the right channel an lps, they both share the predriver tube a jj ecc803, the right channel has jj el84 and left channel eh el84 then the two channels get me differents sounds then I mixed the volumes of the both channels until I achieve the perfect mix, for example I had the 5751 channel a bit higher and with less presence