Goodmans One Ten Receiver Lab Report

Lab Report

Goodmans rated this 584mm-wide receiver at 2x40W/8ohm and 2x50W/4ohm but the One Ten is actually a little more load-tolerant than this might suggest, delivering closer to 2x63W/4ohm and possessing sufficient headroom to accommodate 83W/4ohm under dynamic conditions. This falls to 51W and 27W into 2 and 1ohm, respectively, or 5.2A current at <1% THD – figures that are still above average for the era [see Graph 1]. The One ten also benefits from a uniform <0.05ohm output impedance and a response (–2dB/20Hz to –1dB/20kHz) that holds true into 8ohm down to 1ohm loads. The various filters are less subtle in impact with 'rumble', for example, accurately rated at –3dB/45Hz and –36dB/10Hz, and proving more than sufficient to quell the 'loosest' of reflex-loaded speakers when fed the most vigorous of arm/cartridge resonances! However, the –3dB/6kHz and –36dB/9kHz specification for its 'scratch' filter is wide of the mark – in practice it attenuates HF to the tune of –3dB/8kHz and –36dB/38kHz – just as the volume-dependent loudness 'contour' offers a gentler +4dB/50Hz and +1.8dB/15kHz at 1W/8ohm.

Distortion increases gradually with output from 0.009/1W to 0.02%/10W, 0.03%/30W and 0.3% at the rated 40W/8ohm, this very closely mirroring Gordon J. King's test results in our original review [HFN Mar '72]. At the time, Goodmans specified 'less than 0.1% at any power up to the quoted maximum'. Versus frequency, distortion is impressively uniform, holding to 0.01-0.03% at 1W and 0.02-0.06% at 10W from 20Hz-20kHz [see Graph 2, below] although the A-wtd S/N ratio is a little below par at 75dB (re. 0dBW). Of course, allowances should always be made for a tuner/amplifier that's past its half-century! PM

123vin.lab1

Dynamic power output vs. distortion up to 1% THD into 8ohm (black trace), 4ohm (red), 2ohm (cyan) and 1ohm (green) speaker loads. Max current is 5.2A

123vin.lab2

Distortion versus frequency at 1W/8ohm (5Hz-40kHz, black) and 10W/8ohm (20Hz-20kHz, red)

Power output (<1% THD, 8/4ohm) 43W / 63W
Dynamic power (<1% THD, 8/4/2/1ohm) 50W / 83W / 51W / 27W
Output imp. (20Hz–20kHz/100kHz) 0.042-0.049ohm / 0.175ohm
Freq. resp. (20Hz–20kHz/100kHz, 0dBW) –2.0dB to –1.1dB/–17.5dB
Input sensitivity (for 0dBW/40W) 15.9mV / 101mV
A-wtd S/N ratio (re. 0dBW/40W) 74.9dB / 90.9dB
Distortion (20Hz-20kHz, 10W/8ohm) 0.019-0.059%
Power consumption (Idle/rated output) 11W / 140W
Dimensions (WHD) / Weight 584x115x305mm / 12.3kg
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