Quad 405-1 D3 D4 Upgrade Diodes 1n4148 4x New

New Upgrade Components For Quad 405-1 Amplifier Boards. Simple upgrade to replace 1s920 diodes used for d3 and d4. D3 and D4 are part of the current limiting circuit. Applies to PCB 12368(all issues) and 12565(issue 3 only) High quality audio grade components. Brand New , Fresh stock and Unused. Simple new for old replacement. Clear instructions provided by email. Excellent upgrade following well proven modifications. Components Components sufficient for two boards in one Quad 405-1. Diodes. 4 off 1n4148 Manufacturer. Fairchild. Overview 2 old components are replaced with new components on each pcb. Task Assistance Quad pcb markings show solder pads and component location. Clear graphics enhance information where needed. Text free instructions are multilingual. Work can be done in stages, one pcb at a time. PCB can be worked on within amplifier by removing end plates and lower cover. Aims Achieved Restore accurate reference voltage for current limiting. Utilise existing pcb holes and no track cutting. Performance 4148 diode speed creates faster switching during signal peaks. Increased speed benefits both switch on and swich off. Accurate diode voltage of 0.6v ensures better current limiting behavior. F.A.Qs What advantage is there to removing the pcb ? Condition of other components can be checked with the board removed. What is the sequence of work ? Instructions give a remove and replace order in one list of components. This order has been designed to make the task as easy as possible. Check that the old removed component is the correct one. New components are bagged and identified including antistatic packaging if required. What antistatic precautions should I observe ? Touching/earthing at least two component wires/contacts at once whilst you have a static surplus will damage diodes or the opamp. Touching water taps, pipes or radiators readily discharges static. Using insulated pliers avoids completing the static circuit with your hands. Antistatic wristbands are a good investment. Combined postage available when buying several items. [BuyItNow] > [Continue Shopping] for each item you require Then await combined invoice from seller. POSTAL EXAMPLE Any combinations of the following group 405-1&2 small caps , 4148 , 10 ohm , 4003/75R , opamps , Evox Suppressor IGR , 15v Zener , Elna Stargets , NK 47/100uf TOTAL SHIPPING :- UK = £1.00 . EU = £1.65 . Rest/World = £2.20 Possible Upgrades For Printed Circuit Boards 12368 issue 5, or 6, 7 diode 4003 & resistor 75R , diode 4148 , zener 15v , resistor 10R 2w , opamps , input gain reduction , 405-1 board capacitors 12368 issue 9 with serial number below 29000 diode 4003 & resistor 75R , diode 4148 , zener 15v , resistor 10R 2w , opamps , input gain reduction , 405-1 board capacitors 12368 issue 9 with serial number above 28999 12368 issue 10 and 12565 issue 3 diode 4003 & resistor 75R , diode 4148 , resistor 10R 2w , opamps , input gain reduction , 405-1 board capacitors 12565 issue 5 diode 4003 & resistor 75R , resistor 10R 2w , opamps , input gain reduction , 405-2 board capacitors 12565 issue 6 and issue 7 resistor 10R 2w , opamps , input gain reduction , 405-2 board capacitors Issue numbers are marked on the printed circuit boards. Serial number silver plate is to the rear of the base plate in the centre. Paypal Only Please If Outside The UK

Quad 405-1 D3 D4 Upgrade Diodes 1n4148 4x New