Huldra, a
leading model with a name full of tradition in the Norwegian radio industry.
This is the tenth model bearing this illustrious name: 6 wavebands; powerful
stereo amplifier and many refinements making it a very advanced receiver. The Huldra is a top quality product.
Features:
FM,
longwave, mediumwave, and 3 shortwave bands;
Large,
open-scale;
FM stereo
decoder;
Pre-tuning
for 4 FM stations;
FM muting;
FM receiver
with MOSFET transistors, 4-pole ceramic filters and integrated circuits;
AM receiver
with MOSFET input stage;
Stereo power
amplifier with 2 x 25 watts sine wave output power in 8 ohms;
Frequency/Loudness
compesated volume control;
High and Low
filters;
Connections
for a record player (magnetic or ceramic pick-up) anda tape recorder. In
addition connection for an extra programme source;
Front output
for stereo headphones.
The FM
Receiver
The most
important characteristic with a receiver is good sensitivity. The FM receiver
in the Huldra is based on field-effect transistors (MOSFETs) and integrated
circuits; these ensure very good sensitivity and at the same time provide good
protection against strong, interfering, nearby stations. The receiver also
includes new ceramic filters providing good selectivity and low distortion. The
stereo decoder has integrated circuits with a phase-locked-loop oscilator which
gives high channel separation and low distortion with reproduction of stereo
transmissions. With the two tuning meters it is easy to tune in the stations
precisely.
The AM
Receiver
The 3
shortwave bands cover the entire international shortwave spectrum. There is a
built-in antenna for longwaves and mediumwaves. In addition the receiver has
special features; six tuned circuits in the intermediate frequency amplifier
provide good selectivity. Field-effect transistors also play their part in the
AM receiver. The Huldra 10 has such good sensitivity that even very weak
stations can be pulled in, but it also tolerates signal from strong stations. A
special filter reduces disturbing whistles caused by adjacent stations.
Power
Amplifier Section
There are
many advanced refinements that go towards making Huldra a special receiver. The
power amplifier, for example, has a fully complementary output stage giving
very low crossover distortion - clean sound. An "electronic protection
circuit" prevents damage if the loudspeakers should be accidentally
short-circuited. There is a balance control and common volume control for both
channels. The loudness compensation on the volume control can be disconnected.
Huldra 10
has two very good filters (High and Low) that reduce noise from programme
sources (hiss or rumble). The pre-amplifier is corrected for a magnetic
pick-up, (RIAA) with a switch for adjustment for a ceramic pick-up.
Recommended
loudspeakers for the Huldra
There are
three Tandberg speakers particularly suitable for the high quality amplifier in
the Huldra 10. first we recommend the TL-2520, a 3-way 25 litre hi-fi system
giving excellent reproduction from 45 to 20,000 Hz. An alternative is a larger
model, the TL-3520.
Specifications
Amplifier
Section
Output Power
Per
channel, sine wave, with 1 kHz in 8 Ω
(4 Ω): 28 W (38 W) Both channels driven
simultaneously DIN 45500
Per
channel , sine wave, from 20 to 20,000 Hz in 8 Ω: 25 W Both channels driven simultaneously. 0,3%
Distortion
Distortion
(with output power 1 dB below nominal and lower at 1 kHz in 8 Ω (4 Ω): 0,1% (0,15%)
Intermodulation
(according to DIN 45 500): 0,6%
Damping
Factor (nominal output power in 8 Ω
(4 Ω): 60 (35) 20-20,000 Hz
Frequency
Response (from linear inputs (-15 dB): 15 - 50,000 Hz
Channel
Separation (at 1 kHz minimum): 60 dB
Tone
Controls:
Treble Control at 10 kHz : ±15 dB
Frequenzy/Loudness
at 10 kHz : +7 dB
Bass Control
at 50 Hz : ±16 Hz
Frequency/Loudness
at 50 Hz : +12 dB
Low Filter
-12 dB/oct, -3 dB at 75 Hz
High
Filter -12 dB/octave, -3 dB at 7 000 Hz
Input
Sensitivity (nominal output power in 8 Ω):
Tape 1 : 280
mV
Tape 2
(Extra) : 280 mV
Phono 1 Magn. (cer) : 2,4 - (72 mV)
Signal-to-Noise
Ratio (2x50W in 8 Ω according to DIN
45 500):
Tape 1 : 60
dB
Tape 2
(Extra) : 60 dB
Phono 1 : 60
dB
Tuner FM
Section
Wave
Band: 87,5 - 108 MHz
Frequency
Response (-3dB): 20 - 15,000 Hz
Sensitivity
in Mono (for 26 dB S/N according to DIN 45 500 with 75/300 Ω aerial impedance): 0,8 µV/1,6 µV
Sensitivity
in Stereo (for 46 dB S/N according to DIN 45 500 with 75/300 Ω aerial impedance): 20 µV/40 µV
Signal-to-Noise
Ratio (with 1 mV aerial voltage):
Unweighted
(according to IHF), Stereo/Mono : 66/68
dB
Weighted
(according to DIN), Stereo/Mono : 54/58 dB
Unweighted
(according to DIN) , Stereo/Mono : 61/63 dB
Distortion
(according to DIN), Stereo/Mono :
0,4%/0,2%
Selectivity
(according to IHF), ±400 Hz : 80 dB
Image
Frequency Rejection Ratio: 70 dB
AM
suppression: 50 dB
IF
Rejection: 95 dB
Limiting
(-3dB) with 75 Ω aerial
impedance: 0,7 µV
Muting
Thereshold with 75 Ω aerial
impedance: 1,5 µV
Capture
ratio: 1,5 dB
Channel
Separation (accor. to DIN 45 500): 40 dB
Pilot Tone
Suppression (accor. to DIN 45 500): 35
dB
38 kHz
Suppression (accor. to DIN 45 500): 50
dB
AM Section
Wave Bands
Long wave
: 150 - 268 kHz
Medium wave
: 518 -1600 kHz
Short wave [
I / II / III]: 3,3 - 10 MHz / 10 - 20
MHz / 20 - 30 MHz
Selectivity
at 1 MHz (±9 kHz): 43 dB
Distortion
with 30% modulation: 1%
Sensitivity
at 1 MHz (30% mod. and 20 dB S/N): 50 µV
General
Wood Finish
Veneers: Teak or Rosewood ( Oak, Walnut
to order)
Main
Voltage: 220/240 V (alt.115 -230 V)
50/60 Hz
Dimensions
(W x H x D): 535 x 120 x 305 mm
(21" x 4-3/4" x 12") without knobs
Weight: 8,2 kg (18 lbs)