The ha25.3 is a fully balanced headphone amplifier with a hybrid architecture: a differential tube input stage built on two Philips JAN 6112 tubes feeds a discrete solid-state output buffer. Two line-level inputs serve three headphone outputs in 3.5 mm, quarter-inch, and balanced XLR formats, alongside fixed and variable RCA analog outputs. High output power and worldwide voltage compatibility complete the design.
Specifications
Architecture
Fully balanced tube preamp and solid-state hybrid
Tubes
2 x Philips JAN type 6112
Inputs
2 x line level
Headphone outputs
3.5 mm, 1/4-inch, and balanced XLR
Analog outputs
1 pair RCA fixed, 1 pair RCA variable
Weight
1.7 lbs
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