I'm putting together a BOM for my Quad ii / 22 restoration and I'm trying to figure out what C32/33 is and what to replace it with. Is it an old version of a class x or y mains suppression cap? It's shown as a pair of 0.05uF 1000v caps each in series with a 220 ohm resistor, and in my unit they're joined together as a pair with the resistors all in one component, which has exploded and spread its guts around inside the preamp.
They're on the right hand side of the schematic attached
They're on the right hand side of the schematic attached
Attachments
Here's info on what it is:
Snubber - Wikipedia
There will absolutely be people here who are staunch proponents of replacing the cap and resistor and leaving it in the amp (do use a mains rated cap as you mentioned though), but there are millions of similar devices out there without them!
Snubber - Wikipedia
There will absolutely be people here who are staunch proponents of replacing the cap and resistor and leaving it in the amp (do use a mains rated cap as you mentioned though), but there are millions of similar devices out there without them!
Are you connecting the two mains output sockets to just the two channel amps?
Are you able to clean the contacts in S1A and S4? Going forward, dirty or pitted contacts could lead to more snubber stress from contact bounce or arcing.
Are you able to clean the contacts in S1A and S4? Going forward, dirty or pitted contacts could lead to more snubber stress from contact bounce or arcing.
The two amps and eventually the FM radio as well, once I've restored it. Yes I'll clean all the switches and pots as I go through it.
Might be a better idea to use 0.047uF X2 rated safety capacitors in series with a 220 ohm resistor (doubt the value is critical) across those switch connectors. These are rated for connection across the AC mains (the case here when the switch is open) and will not explode or fail shorted.