Same amplifier !  Different tube !   Different voice !
Trying different voice by tube with adapter. Needn't change amplifier anything
Just connect tube and the adapter

Liquid epoxy Resin encapsulation to ensure the perfect shielding property
100% The polytetrafluoroethylene(Teflon) and Silver-Plated Wire.  Specialty:high temperature resistance

Product Description
AMPTATA Payment
AMPTATA Terms of sales
About AMPTATA
Contact AMPTATA 
Service time