These speakers are different and as such you will need more than just a standard toolkit to service them. I provide a list here of things that I have had to buy in order to work on these speakers.
High Voltage Probe - an absolute must. You will NOT be able to measure any of the high internal voltages without some kind of probe specifically designed to measure high voltages. No AVO or DVM can measure 6000 Volts. Also, the power supply in the Quad is wimpy. Any load will cause it to drop in voltage. I use a high impedance probe which drops the voltage by 1000:1. It has an input impedance of 1000 Mohms. I bought mine direct from RS components but you could make your own. It is essentially a voltage divider. If you want to get really flashy you could get an electrostatic voltmeter but these are not easy to find and aren't actually necessary. You could also try using a voltage divider and an insulated gate FET transistor. What you are looking to do is put NO load on the power supply.
Diaphragm Material - If your going to be replacing treble panel diaphragms you will want something to replace them with. You need to get some Polyester film which is 6 Microns thick. Polyester film is sold by different companies under their own trade names - Mylar, Melinex, Hostaphan, Clysar - these are all trade names for Polyester (Polyethylene Terypthalate) film. I would suggest you buy a part used roll. You probably don't want 20 miles of the stuff. Bass panels use 12 micron PVC film which rarely fail. When they do I use Polyester film.
Conductive Coating Material - You are going to need to apply a conductive coating to the surface of the diaphragm. Several coatings have been suggested from various sources. These include wallpaper paste, liquid soap, toothpaste and most popular graphite. Whichever you choose if you haven't done any diaphragms before you will need to experiment.
Stretching Jig - you will need to hold the new diaphragm taught while you apply the conductive coating and while its being glued to one of the stators. Several designs have been suggested including a straightforward frame type which uses bolts to apply tension to the diaphragm, a design which uses a bicycle inner tube which when inflated gives the desired tension and lastly a similar design to the original Quad stretching machine which used several small weights which were hung on the edge of the diaphragm. All these jigs serve three purposes - to apply a tension to the diaphragm, to hold it while its having the conductive coating applied and to hold the diaphragm while its being stuck to one of the stators. Of these designs the first is the easiest for a hobbyist to make themselves but the third design gives the most consistent results as far as diaphragm tension is concerned. Make your own choice.
|Description||Supplier||Part No.||Where used|
|High Voltage Probe||RS Components||610-281||to measure internal voltages|
|Silver Loaded Paint||RS Components||101-5621||repair arcing damage|
|Red Heat Shrink Tube||RS Components||398-278||bass panel supply solder post|
|22 Mohm Resistor||RS Components||164-8445||treble panel supply|
|10 Mohm Resistor||RS Components||164-8401||bass panel supply|
|2.2 Mohm Resistor||RS Components||164-8316||input on voltage multiplier|
|330 Kohm Resistor||RS Components||149-105||input on voltage multiplier|
|Silicon Diode 1N4007||RS Components||261-980||voltage multiplier|
|Diode GP02-30 (alternative to above)||RS Components||195-3551||voltage multiplier|
|10000pf 2kV Capacitor||RS Components||305-5255||voltage multiplier|
|Heavy Duty PVC Sticky Tape||RS Components||198-6719||around panels to seal them|
|Isopropanol Degreasing Solvent||RS Components||693-775||genral purpose electrical cleaner|
|Anti-Corona Lacquer||RS Components||569-313||inside panels to repair arced area|
|High voltage internal cable RED||Arrow Components||440023R||Bass panel power supply|
|High voltage internal cable BLACK||Arrow Components||447635E||Bass panel audio signal|
|High voltage internal cable WHITE||Arrow Components||437637A||Bass panel audio signal|
|150 Kohm 2watt resistor||Arrow Components||016314AM||Cross over|
|180 Kohm 2watt resistor||Arrow Components||072537H||Cross over|
|270 Kohm 2watt resistor||Arrow Components||016320EM||Cross over|
|560pf 2kV capacitor||Murata||DE1507 SL561J2K or|
|200 volt Zenner (11 per circuit)||RS Components||112-4387||Protection circuit|
|Melinex 'S' Polyester Diaphragm Film 12 Micron Thick||PSG Ltd||N/A||new diaphragm material|
|M3 * 8mm long pan head slotted screw||any fixings co.||N/A||to hold treble panel together|
|M3 * 12mm long pan head slotted screw||any fixings co.||N/A||to hold bass panel together|
|M3 nut||any fixings co.||N/A||to hold bass/treble panel together|
|M3 washer (2 per screw/nut)||any fixings co.||N/A||to hold bass/treble panel together|
|Soluble Nylon||Dupont, Hemel Hempsted (01442 218500)||Elvamide® 8023R||Bass and treble panel diaphragm coating|
|Methanol||www.blackburnmodels.com (do a search for methanol)||N/A||To dissolve soluble Nylon|
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