Einstein preamp tubes

[Kilian]

Hi,

I own an Einstein 100 Head and I want to change the preamp tubes to play around with different sound types.
If I open the Einstein form the back I see my 4 power amp tubes and behind 6 preamp tubes. Which one is responsible
for the sound(which one is responsible for what?)
I own two Groove Tubes GT-7025 and I want to try them out. To help me just say the number of preamp tubes I should change. Watch the
description below.

FRONT of the amp

Preamp tubes T6 T5 T4 T3 T2 T1

Poweramp Tubes EL34_4 EL34_3 EL34_2 EL34_1

BACK of the amp(I opened the black back plane)

Kilian

 

[LaXu]

You can find the descriptions on the Diezel website.