Tuners

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HQ conventional receivers & tuners.

Conventional tuners

Car Receiver Specifications

PIONEER KEH-P4850 CAR CASSETTE RECEIVER: 1998

Manufactured in Malaysia.

Supertuner III series.

Strong resistance to three signal intermodulation & multipath interference.

Pioneer Electronics is one of the few manufacturers that specifies the three-signal intermodulation measurements of its car receivers.


Mono Usable sensitivity	11 dBf (1.0 mV/75 W, S/N: 30 dB)
Signal-to-noise ratio	70 dB (IEC-A network)
Alternate Channel selectivity (unmodified)	70 dB
Number of IF Filters - FM section	3
Stereo separation	40 dB (at 65 dBf, 1 kHz)
Distortion	0.3% (at 65 dBf, 1 kHz, stereo)
Frequency response	30 – 15,000 Hz (±3 dB)

Component Tuner Specifications

YAMAHA TX-500 TUNER: 1987,

TX-530 TUNER: 1989,

TX-540 TUNER: 1990

Dual bandwidths using 4 filters for narrow, 2 filters for wide. Selectable tuning frequency steps. High accuracy Multipath & Signal Level indicator. Belling Lee/PAL Female antenna sockets. Rotary dial tuning (TX-540). Radio station name storage (TX-540).

Solid Japanese workmanship. Available in titanium or black colours (TX-530).

Photograph courtesy of the AudioKarma.org audio portal. This series is pending review at the FM Tuner Information Centre.

On Deck Circle

Mono Usable Sensitivity - 30 dB quieting - Narrow IF	0.8uV/75 ohms (9.3 dBf)
Signal - to - Noise Ratio - at 85 dBf	Mono 82 dB Stereo 75 dB
Alternate Channel selectivity (unmodified) - Narrow IF	85 dB
Number of IF Filters - FM section (modified)	4
Number of IF Filters - FM section (unmodified)	4
Stereo Separation - at 1 KHz	50 dB
Spurious Response Ratio - at 98 MHz	70 dB
Capture Ratio - IHF	1.5 dB
IF Response Ratio - at 98 MHz	90 dB
Distortion - at 1 KHz - Wide IF	Mono 0.05 % Stereo 0.07 %
50 dB Quieting Sensitivity (an alternative tuner sensitivity measure)	Mono 1.55uV (15.1 dBf) Stereo 21uV (37.7 dBf)
Image Response Ratio - at 98 MHz	40 dB
Frequency Response	20 - 15 000Hz (±1.5 dB)

YAMAHA T-28 TUNER: 1986

Manufactured in Japan.

Shares same internal board as Yamaha T-420 & T-30 tuners.

German model features a High Pass filter (T-420). 10 segment Signal Level indicator.

Mono Usable Sensitivity - 30 dB quieting	0.8uV/75 ohms (9.3 dBf)
Signal - to - Noise Ratio - at 85 dBf	Mono 82 dB Stereo 75 dB
Alternate Channel selectivity (unmodified)	85 dB
Number of IF Filters - FM section (modified)	4
Number of IF Filters - FM section (unmodified)	2
Stereo Separation - at 1 KHz	40 dB
Spurious Response Ratio - at 98 MHz	70 dB
Capture Ratio - IHF	1.5 dB
IF Response Ratio - at 98 MHz	90 dB
Distortion - at 1 KHz	Mono 0.1 % Stereo 0.2 %
50 dB Quieting Sensitivity (an alternative tuner sensitivity measure)	Stereo 21uV (37.7 dBf)
Image Response Ratio - at 98 MHz	40 dB

These specifications relate to their unmodified FM section performance. Measurements have been sourced from service manuals. All tuners appearing on this page have been modified slightly (all the original FM IF filters have been replaced with narrower 50, 80 & 110 kHz ones). These filter modifications may improve or degrade individual values. The Yamaha T-28 was modified with an inexpensive Bill Ammons' Filter Adder board. These boards double the available conventional IF filters available in your tuner if you want to DIY. See the FM Tuner Information Centre for purchase details for these boards, which were still available in 2011. Even though they are designed for "in car use", the car tuners are used inside the house with 12v DC power using Jaycar regulated power supplies.