50 Watt Biacrown Heads

Biacrown DR504 S

This is an unusual Biacrown head with bright blue tag boards! It looks like a normal "OL" model otherwise.

The front view
The chassis
The serial tag
The internals
Another look at the blue boards
A closer view, which shows the blue color better.

Biacrown DR504OL

This is a Biacrown variation on the two-input Hiwatt head. The outside looks the same as a normal two-input Hiwatt, but an extra gain stage was added between the input stage and the tone stack.

The front view
The rear view
The overall internals view
The preamp PCB
The power PCB
Extra OL components wired point to point on a tube socket

Main Hiwatt Page