Excellent vintage tube preamplifier made in USA in the 1950s . Housed in original portable chassis.
The circuit employs octal pentode tubes and good sized Triad transformers.
We wanted to lower the overall noise of the preamp, the old capacitors weren’t really up to specs anymore.
All the power supply filter capacitors have been replaced with good quality German made capacitors.
The capacitors in the audio path have been replaced as well. This considerably improved the tone of the preamp.