Where can I find durable tubes for Hiwatt bass amps and guitar amplifiers?

For Hiwatt tube amplifiers, the tube types suitable for the respective model are especially important. This applies in particular to classics such as the DR103 with EL34, ECC83 / 12AX7 and ECC81 / 12AT7, but also to models such as Custom 20 / Little Rig with EL84 and ECC83, as well as the Tube Series T20/10 and T40/20 with EL84, ECC83 and ECC82 / 12AU7. With Hiwatt, cleanly selected sextets and quartets of power tubes such as KT88 are especially important, so that headroom, dynamics and reliability match the respective circuit. All these types are also available from BTB in hand-selected matching quality (S4GB V1 and power tubes).