QUAD 405-1 & 405-2 UPGRADE input gain reduction on eBay, also Power Amplifiers, Amplifiers, Home Audio Hi Fi, Consumer Electronics (end time 21-May-08 22:39:08 BST)

New Upgrade Components For Quad 405-1 and 405-2 Amplifier Boards.
A group of components that reduce the input stage gain to 1.5 volts.
The new gain provides a s/n ratio approaching the creditable Quad 606.

High quality audio grade components.
Brand New , Fresh stock and Unused.
Clear instructions provided via email.
Excellent upgrade following well proven modifications.

Buyers of these components should note that a pair of capacitors for C2 are included.
Non polarized 47uf or 100uf are replaced by 33uf for C2
Components
Components sufficient for two boards in one Quad 405-1 or 405-2
Two of each component supplied unless stated.
Capacitors. 100nf polypropylene, 150nf mkt, 33uf np C2
Resistors Metal Film. 100k
Saundries. desoldering braid
Manufacturers. Epcos, Evox Rifa, NK, Welwyn.
Overview
3 old components are replaced with new components on each pcb.
1 new component is added to the solder track side of 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
Reduce input stage gain.
Restore optimum feedbacks.
Improve S/N ratio.
Adopt standard 1,5v sensitivity for Quad 34/44 and later phono outputs.
Utilise existing pcb holes and no track cutting.
Performance
A more realistic presentation with less distortion on hf low level sounds.
Dynamics and detail improve to make for impressively lifelike soundstaging.

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 ?
The components in this listing do not require antistatic precautions.
Direct contact with onboard semiconductors (diode,transistor,opamp,network)
is best avoided.
Combined postage available when buying several items.
The highest postal fee of your items is the single fee you pay.
[BuyItNow] > [Continue Shopping] for each item you require
Then await combined invoice from seller.

Possible Upgrades For Quad 405-1&2 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.

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