I want to give my Valhalla board a bit of a service since some of the components look a bit tired especially the 3 big smoothing caps
Some questions for the LP12 guru's please
1. The rating on these 3 caps (C1, C2 & C18) is 250V 47uf but most recommendations online are to rather replace them with 450V 47uf which makes sense to me? Was thinking of getting these http://za.rs-online.com/web/p/aluminium-capacitors/3245442/
2. Resistor R001 is there to help assist with surges from what I understand, Linn have apparently changed the 47Ohm resistor with a Thermistor (SG240) which has a rating of 40 Ohm 265V but I can't seem to find this or suitable replacement in SA, do I keep searching or just replace with a 47ohm resistor?
3. R002, R003 these have clearly been burnt out in the past and have been replaced as a precaution I'll replace them again anyway
4. Should I replace all the caps on the board or is it ok to just replace the electrolytic caps?
5. R033 has overheated so I'll replace this but probably with a .5W and not .25W as I see from later boards this seems to be the norm
6. Should I bother replacing the bridge rectifier and is this a suitable replacement? http://za.rs-online.com/web/p/rectifier-schottky-diodes/3952752/?sra=pmpn
7. It looks like someone has done the zener diode mod on this board, I'll replace these diodes and resistor though as a precaution
BTW, I got the component parts list from here which is a handy doc: http://www.theanalogdept.com/images/spp6_pics/Linn/Valhalla%20Parts%20List.pdf
I also want to do the bolt mod, my plinth doesn't have the bracing which is needed for the bolt mod so I may just add some bracing while I'm doing the board. I'll probably end up giving the plinth a new coat anyway.
Some questions for the LP12 guru's please
1. The rating on these 3 caps (C1, C2 & C18) is 250V 47uf but most recommendations online are to rather replace them with 450V 47uf which makes sense to me? Was thinking of getting these http://za.rs-online.com/web/p/aluminium-capacitors/3245442/
2. Resistor R001 is there to help assist with surges from what I understand, Linn have apparently changed the 47Ohm resistor with a Thermistor (SG240) which has a rating of 40 Ohm 265V but I can't seem to find this or suitable replacement in SA, do I keep searching or just replace with a 47ohm resistor?
3. R002, R003 these have clearly been burnt out in the past and have been replaced as a precaution I'll replace them again anyway
4. Should I replace all the caps on the board or is it ok to just replace the electrolytic caps?
5. R033 has overheated so I'll replace this but probably with a .5W and not .25W as I see from later boards this seems to be the norm
6. Should I bother replacing the bridge rectifier and is this a suitable replacement? http://za.rs-online.com/web/p/rectifier-schottky-diodes/3952752/?sra=pmpn
7. It looks like someone has done the zener diode mod on this board, I'll replace these diodes and resistor though as a precaution
BTW, I got the component parts list from here which is a handy doc: http://www.theanalogdept.com/images/spp6_pics/Linn/Valhalla%20Parts%20List.pdf
I also want to do the bolt mod, my plinth doesn't have the bracing which is needed for the bolt mod so I may just add some bracing while I'm doing the board. I'll probably end up giving the plinth a new coat anyway.
