Specifications

Wheatfield AudioWheatfield Audio HA-1 Owners ManualHA-1 Owners Manual
8/30/00 Page 8
Specifications
Note: Specifications listed are typical,
and are derived from measurements on
actual amplifiers. There will be some
variation from one amplifier to the next.
Specifications are subject to change
without notice.
Description
Single-ended, OTL, class-A triode
amplifier
Single voltage amplifier stage, single
cathode follower stage
DC-coupled input; capacitor-coupled
output.
General
Input impedance: 50k ohms
Input connections: Unbalanced, gold-
plated RCA
Tube complement: 1x ECC82 (12AU7),
2x 7044
Power supply: Silicon rectifier, 3-stage
RC filter
Power requirement: 117V, 60 Hz, 50W
Dimensions: 9.5” W x 4” H x 7.5” D
Weight: TBD
Warranty: One year on all parts,
including tubes
As a Headphone Amplifier
Frequency Response (+/- 3dB) :
600 ohm load: <9Hz - 250kHz
32 ohm load: 12Hz – 250kHz
THD+N (1kHz, 1V RMS out, 100 ohm
load): <0.12%
Noise: TBD
Maximum output voltage (5% THD):
600 ohm load: 13V RMS
32 ohm load: 1.5V RMS
Output impedance: Approx. 35 ohms
Output connection: Standard ¼” stereo
headphone jack
As a Pre-Amp
Frequency Response (10k ohm load) :
<9Hz - 250kHz +/- 3 dB
<9Hz - 95kHz +/- 1 dB
THD+N (1kHz, 1V RMS out, 10k ohm
load): <0.18%
Noise: TBD
Maximum gain: 28 dB
Maximum output voltage (5% THD):
10k ohm load: 15V RMS
600 ohm load: 8V RMS
Output impedance: Approx. 35 ohms
Output connections: Unbalanced, gold-
plated RCA