Hagerman Audio Labs: PA-10 Vacuum Tube Monoblock Power Amplifier 6W 2A3

"PA-10" Vacuum Tube Power Amplifier (6W)

$2299

The PA-10 is a new type of tube amplifier, offering the unique Hagerman self-balancing output stage. This topology allows the use of unmatched 2A3 power tubes and requires no adjustments. In fact, it will even run on just one output tube. Distortion is exceedingly low, especially given the fact that no feedback is used, thanks to the harmonic cancellation of the output stage, which operates partially in both single-ended parallel and push-pull differential modes. This balance results in SET-like musicality yet with PP control and dynamics. The PA-10 is a no-holds-barred design and pushes the state-of-the-art in vacuum tube amplification. There is nothing else like it on the market.

Features

Class-A operation, all tube signal path, no feedback

Vacuum tube B+ rectification

Choke input power supply

Self-balancing Hagerman push/pull/parallel output stage

4 ohm and 8 ohm taps

Specifications

Input Impedance:	100k ohms
Sensitivity:	0.95Vrms
Output Power:	6 watts
Distortion:	0.5% at full power @ 1kHz
Noise:	85dB A-weighted ref 1W
Size:	10" x 10" x 4"
Weight:	15.5 pounds
Power:	120Vac, 90W
Tube Compliment:	5AR4 x 1, 6E5P x 1, 2A3 x 2

Downloads

User Manual (282k pdf)

Photo of Amplifier (65k jpg)

Photo of Power Supply (65k jpg)

Schematic (32k pdf)