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SAM-A1 Owner’s Manual

FSL0132

Fireworks Solutions Limited (FSL) has proprietary rights in the information disclosed herein. The recipient, by accepting this document agrees that neither this document nor the

information disclosed herein nor any part(s) thereof shall be produced in any manner whatsoever or transferred to other documents or media or used or disclosed to any third party

for any purpose except as specifically authorised in writing by FSL. All rights reserved under the copyright laws.

FSL0132 Version 5.1 © 2020 Fireworks Solutions Limited Page 1

SAM-A1 Stereo Audio Valve Amplifier

Owner’s Manual

READ BEFORE OPERATING THIS EQUIPMENT

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Summary of Contents for SAM-A1

Page 1: ...losed herein nor any part s thereof shall be produced in any manner whatsoever or transferred to other documents or media or used or disclosed to any third party for any purpose except as specifically authorised in writing by FSL All rights reserved under the copyright laws FSL0132 Version 5 1 2020 Fireworks Solutions Limited Page 1 SAM A1 Stereo Audio Valve Amplifier Owner s Manual READ BEFORE OP...

Page 2: ...ur SAM A1 amplifier safely The SAM A1 must only be used for its intended use this is defined as follows The SAM A1 is intended for use as a stereo audio amplifier for indoor domestic use only being operated within the specifications stated in this document and on the rear of the equipment The unit is intended for use when all earthed protective covers are in place and with all the valves correctly...

Page 3: ...ages 5 2 2 High Surface Temperatures 5 3 1 Equipment Operating Specifications 6 3 1 1 Power Supply 6 3 1 2 Signal Input 6 3 1 3 Signal Output 6 3 2 Hazardous Voltages Fragile Components 8 3 3 Mechanical properties 9 3 3 1 Dimensions and Mass 9 4 Getting to know the SAM A1 10 4 1 Connections and controls 10 4 2 Connecting the SAM A1 to your other audio equipment 11 5 Installing the valves 12 6 Usin...

Page 4: ...s ac Alternating Current dc Direct Current FSL Fireworks Solutions Limited HBC fuse High Breaking Current also known as high rupture current fuses are designed to break the circuit without breaking themselves at currents much higher than the rated fuse blow current RoHS Restriction of Hazardous Substances regulations 2019 WEEE Waste Electrical and Electronic Equipment 2002 Vac rms Voltage Alternat...

Page 5: ... CE marking directives are recorded in FSL s Technical Construction File FSL accept no liability for any damage or injury sustained through or as a result of the modification of the amplifier or its use for anything other than the stated intended use 2 2 High Surface Temperatures WARNING Valves get HOT Up to 220o C1 Do not touch the valves when they are on or until they have cooled down at least t...

Page 6: ...e winding wires as follows 210 5V Violet 220 5V Grey 230 5V Red 240 5V White This is set as the default good for around 225 253Vac in 250 5V Black If the mains supply is too high for the selected input the amplifier will get hotter rear plinth wasting energy The valve heaters will be run hotter and depending on the valves chosen maybe even too hot this will reduce the life of your valves There is ...

Page 7: ... to any third party for any purpose except as specifically authorised in writing by FSL All rights reserved under the copyright laws FSL0132 Version 5 1 2020 Fireworks Solutions Limited Page 7 Note that the 0V or negative of both the inputs and outputs is connected to 0V of the amplifier By default this is connected to chassis and Earth of the Mains power socket via a 10 Ohm 3W Metal Film resistor...

Page 8: ...ered by the metal case The IP20 rating specifies protection against solid objects 12mm i e fingers from gaining access to hazardous voltages the largest apertures are 5mm diameter vent holes around the valves and 4 x 20 mm ventilation slots in the lid and base A standard test finger in accordance with IEC60529 cannot access any hazardous voltages through any of the apertures in the case DO NOT ins...

Page 9: ...There will always be an air gap under the amplifier to allow air to circulate through the unit The Height also excludes the valves which depends on the configuration used regardless of which valves are fitted it is recommended that at least 300mm be allowed above the top surface of the amplifier for heat dissipation see section 2 2 The mass of the assembled unit is 7 75kg 0 25kg According to HSE g...

Page 10: ...1 2020 Fireworks Solutions Limited Page 10 4 Getting to know the SAM A1 4 1 Connections and controls On the rear of the amplifier you will find the following connections 1 Mains supply input socket a 90 degree plug reduces the space needed behind the amplifier 2 Power Switch shown here in the OFF position switch down is ON 3 A pair of input sockets RCA for connection to your pre amplifier or direc...

Page 11: ...pment Note the audio source connected to the inputs must be a big enough amplitude voltage to drive the amplifier i e a turntable record player with an output of only a few tens of millivolts will require a preamplifier to get the signal up to the 250 500mV input required by the SAM A1 amplifier If your audio source already has a compatible signal it may be connected directly to the SAM A1 inputs ...

Page 12: ...r SAM A1 amplifier did not come with the valves installed see section 7 for instructions on how to fit a valve to its base The valves will all be in boxes labelled with their position in the amplifier valve V1 V2 V3 V4 V5 and V6 Each valve will also have a unique number that will be written on the box and written on the glass between the pins at the base of the valve just in case the valve and its...

Page 13: ...ument nor the information disclosed herein nor any part s thereof shall be produced in any manner whatsoever or transferred to other documents or media or used or disclosed to any third party for any purpose except as specifically authorised in writing by FSL All rights reserved under the copyright laws FSL0132 Version 5 1 2020 Fireworks Solutions Limited Page 13 Correctly installed valves ...

Page 14: ...lutions Limited Page 14 6 Using the SAM A1 amplifier Once the amplifier has been connected as per section 4 2 and the valves are fitted as per section 5 your amplifier is ready to use Ensure the volume control is at minimum see picture above and turn on the amplifier Within 10 seconds you should see all the valves glowing orange and if you look carefully probably some blue too remember they get ho...

Page 15: ...dea as a fall on to a hard surface can dislodge the internal mechanical arrangement of the valve resulting in premature failure and internal short circuits which can damage the amplifier If you have dropped your valves during the installation do not switch on your amplifier contact us and we will arrange for your valves to be sent back to us to be tested before you fit them Follow the following st...

Page 16: ...ve by wrapping it in several layers of paper sealing it with sticky tape and then dispose of the broken valve in domestic waste Do not recycle Removing a valve from its base 7 1 3 New valves or replacement valves of the same type If for any reason you wish or need to change the valves in your SAM A1 it is imperative that you note the following Valves should always be replaced as sets i e a pair of...

Page 17: ...arly stubborn marks may be removed using a damp cloth e g baby wipe followed by a dry microfiber cloth to dry the surface If using a damp cloth do not clean inside the diameter of the cooling vent holes around each valve base keep moisture away from the holes and valve bases If there is any doubt that moisture has come in to contact with the valve bases remove the valves and allow the unit to dry ...

Page 18: ...t appropriate mains input setting for your amplifier before delivery Failing that FSL can survey your mains supply for you during a visit to your installation and we will configure your SAM A1 to your mains supply This is only offered to UK mainland and may be subject to travel charges incurred 6 month or annual re biasing Annual service including valve check complete set up and re calibration of ...

Page 19: ...y The bias current is measured by measuring the bias Volts on the 10R current sense resistors in series with the cathodes for each output valve R19 R20 R47 and R48 50mA reads 500mV There are test points labelled Vb at the 3 o clock position of each output valve accessible with the top plate on These are J51 J52 J53 and J54 The bias current is increased by reducing the negative bias at the grids of...

Page 20: ...e fuse are 5x20mm HBC 2 5AT Internal Fuse is blown If you have checked replaced both the Valves are all glowing no sound is produced Speakers not connected Check the speakers are connected properly both at the speaker terminals connectors and at the amplifier ensure the wire and not the insulation is in the terminal post if unterminated wires are used Input not connected or turned on e g Bluetooth...

Page 21: ...nnectors and at the amplifier ensure the wire and not the insulation is in the terminal post if unterminated wires are used Speakers too high impedance Check the specification of your speakers against section 3 1 3 Perfectly acceptable volume ought to be achievable with speakers in the range 6 16 Ohms but best performance and power will be achieved with the correct speaker impedance of 8 Ohms Your...

Page 22: ...d intended use FSL will repair or replace the SAM A1 if it develops a fault related to the manufacture or quality of the materials used in its assembly If your SAM A1 develops a fault please contact FSL immediately We will then agree the best way to resolve the issue If the problem cannot be resolved over the phone then it is the customer s responsibility to arrange for the unit to be shipped safe...

Page 23: ...orne Dorset BH21 2JY 3 This declaration of conformity is issued under the sole responsibility of the manufacturer 4 Object of the declaration the SAM A1 stereo valve amplifier covered by the SAM A1 Technical Construction File FSL0131 5 The object of the declaration described above is in conformity with the relevant Community harmonisation legislation Low Voltage Directive 2014 35 EU Electromagneti...

Page 24: ... 24 12 RoHS and WEEE statement While all of the components that are used to construct the SAM A1 are RoHS and WEEE compliant the technology of valves pre dates these regulations and directives by some decades The RoHS and WEEE status of the valves themselves is unknown so it is assumed that they are not compliant In addition the technology operating conditions high temperature and high voltage do ...

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