This floor linked-input preamp is based on Hiwatt DR103 amp. Channels are jumped inside and each one has its own gain control (NORMAL and BRILL). There are PRESENCE and MASTER controls as well. 

There are two preamps in one! Second option is a special HIWATT model DR504OL. It uses additional tube stage to get more gain. As far as classic DR103 uses 3 stages only (every tube consists of two halves, two stages), I engaged fourth stage to make a second HIWATT sound in the same enclosure. Of course, it is switchable. In normal switch position you play classic DR 103. Pushing "overdrive" footswitch you get DR504OL version.

TECH:

• All analog low noise signal path

• Original anode voltage DC 400v

• Internal Torroidal power transformer- no need any 9 - 12 v power adapters

• WIMA capacitors

• Treble Middle Bass tone stack

• Internally jumped NORMAL and BRILL channels

• Master Volume

• Presence control

• Additional DR504OL channel

• Tube main output (high impedance)

• Cabinet Simulated output (low impedance)

• "Cold" bypass

• 5,1 inch x 7,5 inch

There are 120v - 230v versions in stock.