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Introduction 

This translation contains all pages from the original Norwegian Huldra 8 

owner’s manual

 with an 

English translation on the same page. In addition, I have added page 19 with translated figures. The 
English text is kept close to the original Norwegian text written in 1965. Text in italics are my own 
comments and annotations. 

I hope you’l

l find this translation useful. 26. May 2021. Trond B.   

Congratulations on your new Huldra 

We hope that the unit will serve you faithfully for many years and bring you joy every day. Huldra 
has a lot of features, but if you take it step by step, you will see that it is quite manageable. Huldra 
can reproduce programs from 5 different sources: 
 

1.

 

AM radio, i.e., long wave, medium wave, coastal wave and short wave. 

2.

 

FM radio.  

3.

 

Tape recorder, mono or stereo. 

4.

 

Turntable, mono or stereo. A separate 2-channel pre-amplifier with 4 transistors will 
ensure full utilization of the power amplifier with the use of magnetic pickup. The pre-amp 
has a selector with correction curves for magnetic, ceramic or crystal pickup. 

5.

 

From the “listen and talk” function, which enables communication with people

 in other 

rooms. 
 

Huldra 8 is prepared for FM stereo multiplex reception. The main circuit board has dedicated 
space and connection points for a decoder for your particular FM stereo system. A separate 
indicator light will light up on stereo sound reproduction. 
 
Huldra 8 has 2 transistorized main amplifiers (class B

1

). Both amplifiers can be used in parallel for 

the same program, or independently for two mono programs or one stereo program. The two 
amplifiers (channels) have individual volume control. Max. output power is 2 x 10 Watt. 
 

 

 

1

 It is a class AB amplifier by current classification 

Summary of Contents for Huldra 8

Page 1: ......

Page 2: ...FM radio 3 Tape recorder mono or stereo 4 Turntable mono or stereo A separate 2 channel pre amplifier with 4 transistors will ensure full utilization of the power amplifier with the use of magnetic pi...

Page 3: ...ntenna mounted outside of your house or in your attic where installation and maintenance may be easier The antenna shall be mounted with the loop perpendicular to the direction to the transmitter send...

Page 4: ...ssible and align the favorite marker accordingly It may also be necessary to depress the AFK button when receiving a weak station which lies close to a strong station The automatic frequency control m...

Page 5: ...pre amps and amplifies it to speaker level The tone controls are implemented in the LF amp feedback loops Program means input source i e radio tape recorder or turntable Klasse B The manual says the...

Page 6: ...siological bass correction Loudness as for Normal Bass The Speaker selector has 7 settings App 1 Sep 2 Left audio channel goes to App main speaker pair right audio channel goes to Sep separate speaker...

Page 7: ...etic MM ceramic or crystal type Speakers Huldra 8 is optimized for 4 ohm speakers but will handle loads from 2 8 ohm with little impact on output power Dipol FM antenna Wire antenna for AM Earth cable...

Page 8: ...ngage in a conversation with people in the room where you have your separate speaker The Sep separate and App main speakers will then work both as speakers and microphones With the speaker selector in...

Page 9: ...el can still be controlled individually The tone controls will work identically on both channels Play Records Ensure the pick up selector at the rear is correctly set according to your pick up type Pr...

Page 10: ...Gram for record player simultaneously The outer volume control controls the radio volume while the inner knob controls the volume of the other program You choose which program goes to which room with...

Page 11: ...re the lower frequencies the speaker can reproduce The self resonant frequency can also be lowered by increasing the mass of the membrane which means more power is required to move it i e the speaker...

Page 12: ...um sound power at 50 Hz Relative to the level at 1000 Hz piano music will be ca 30 dB lower at 50 Hz and orchestra music ca 20 dB lower In an ordinary living room room resonance will provide a certain...

Page 13: ...nal volume 25 liters Driver chassis HT 112 with tweeter Woofer 10 x6 Tweeter 2 Impedance at 400 Hz 3 2 Ohm Max continuous power 8 watt Efficiency frontal radiation only 2 5 Resonant frequency 85 Hz Fr...

Page 14: ...50 AD 149 6 diodes 2 off 1N 542 AA 113 2 off 1S 920 1 off OA 81 and 1 off BA 124 3 rectifiers 1 off B40 C 2200 1 off BY 112 and 1 off 2 8 ST 1 Printed circuit boards ensures improved stability and rel...

Page 15: ...g When dialling in a station the AFK function will automatically fine tune the frequency This function can be switched off Interference filter 9 kHz filter for AM Selectivity selection for AM local or...

Page 16: ...ic pick up The pre amp has a selector with correction curves for magnetic ceramic and crystal pick ups Connections Huldra 8 has 5 pin DIN connectors for connection of tape deck and turntable Some unit...

Page 17: ...rams One amplifier is connected to the tuner and the other i connected to tape deck or turntable Choose which source plays in which speaker pair Listen and Talk can be in the Listen position babysitte...

Page 18: ...Amplifiers Tangent velger Push buttons Grammofon Turntable H yre Right Dynamisk Dynamic here magnetic Venstre Left Keramisk Ceramic Sep Separate Krystall Crystal App Apparat Main B ndopptaker inngang...

Page 19: ...ller in position VARIABEL BASS og DISKANT Curves for min and max as well as a few intermediate settings are shown LEFT CHANNEL RIGHT CHANNEL SEP SPKR SEP SPKR APP SPKR APP SPKR RADIO PROGRAM TAPE TURN...

Page 20: ...20...

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