Q-tron Audio PA34B4 User Manual Download Page 1 | Manualshive

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Q-tron Audio

Q-tron Audio

Manual PA34B4R1

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Q-tron Audio PA34B4 OTL amplifier

user manual

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Summary of Contents for PA34B4

Page 1: ...Q tron Audio Q tron Audio Manual PA34B4R1 Page 1 9 Q tron Audio PA34B4 OTL amplifier user manual ...

Page 2: ...an 60 minutes 6 If the amplifier has been switched on more than 60 minutes 6 5 CONTROLS AND CONNECTORS 6 5 1 Front panel 6 5 2 Back panel 6 5 3 Unbalanced balanced switch 7 5 4 Speaker connectors 7 5 5 Mode 7 5 6 Indication LEDs 7 5 7 Mains power inlet with integrated fuse holder and mains switch 7 6 Q TRON AUDIO AUTOMATIC BIAS CALIBRATOR 7 6 1 Automatic bias tuning of new power tubes 8 7 PERFORMA...

Page 3: ...Q tron Audio Q tron Audio Manual PA34B4R1 Page 3 9 Fig 1 Front view Rear view ...

Page 4: ... surface Make sure that the box is oriented correctly i e that the side marked top is facing upwards Open the box by prying open the metal flaps that are holding the top lid using a screwdriver When all metal flaps are bent so they point upwards the lid can be opened Remove packing material so that the amplifier can be lifted out of the box be aware of the weight and handle the amplifier carefully...

Page 5: ... posts for connecting speakers The amplifier is equipped with an output offset voltage protection circuit that protects connected speakers in the case the amplifier would give a too high DC voltage on the output A fail safe soft turn on circuit is also included 4 2 Start up procedure Switch on the mains switch on the back panel to position 1 Push in the front panel bush button for 1 second the are...

Page 6: ...xtinguished and the amplifier will be switched off If the mains switch on the back panel is in ON position the control circuits are energised and the power consumption is about 5 W In the OFF position all circuits in the amplifier are switched off and there is no power consumption NOTE The amplifier must be connected to speakers or another load to operate correctly if not the offset voltage protec...

Page 7: ...s at the same time 5 4 Speaker connectors Live and ground These connectors accept 4mm banana type plugs bare wire and spade type connectors 5 5 Mode This connector is used to set the mode of the amplifier normal or tuning mode The tuning mode is activated by connecting the tuning plug NOTE Do not connect the monitor box that was used with earlier versions of the PA34 nor connect anything else to t...

Page 8: ...cally tune to correct bias when installing new power tubes 1 Automatically tune bias and output offset voltage to optimal values 2 Controls the real quiescent idle current see https qtron se en articles q tron audio bias calibrator technical background for a complete in depth analysis and explanation 3 Automatic tuning of bias when replacing power tubes The circuit automatically measures and if ne...

Page 9: ... of new power tubes The bias auto calibrator also automatically sets the correct operating parameters for new power tubes Procedure 1 Switch off the amplifier completely also with the switch on the rear 2 Set the amplifier in tuning mode by connecting the tuning plug to the connector on the rear panel 3 Put a new balanced set of 4 power tubes in the channel where they should be replaced 4 Note all...

Page 10: ... complement 9 tubes in total 6C33C x 4 6N6P I x 2 6H2n EB x 3 Input connectors Unbalanced Gold plated phono Balanced Gold plated XLR Output connectors CE approved isolated binding posts accepting 4mm banana connectors spades and bare wire Line voltage connectors IEC320 jack with integrated mains switch and dual fuses Weight 18kg 8 Contact information Manufacturer Q tron Audio Sweden www qtron se s...

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