Some help needed re: old capacitors...

adhoc · 14th December 2006, 07:21 AM

G'day all,

Once again I have some mystery caps I wish to identify!

These 2 capacitors come from a 30 year old B&K 747 tube tester, and I am replacing them with newer examples. However, I wish to maintain their 'type' - i.e. electrolytics replace electrolytics, plastic films replace plastic films, etc - so identifying their type correctly is of paramount importance to me.

LEFT: marked 0.047uF on schematic, I think it's a polyester.

RIGHT: marked 0.01uF on schematic, I think it's a ceramic disc.

Also, are both caps P or NP? It is not clear from the schematic - I think that they're NP though.

Anyone?

Nordic · 14th December 2006, 08:57 AM

the .47U can be replaced with a polypropylene cap just make sure to not go below the 250V rateing.

The ceramic should at least be replaced by a C0G or NP0 type ceramic, or silver mica if you can afford those. just check where you took it out what voltages are there... I thin kthe green dot at the top is a code for 500V

14th December 2006, 07:21 AM	#1
adhoc diyAudio Member Join Date: Jul 2005 Location: Australia	Some help needed re: old capacitors... G'day all, Once again I have some mystery caps I wish to identify! These 2 capacitors come from a 30 year old B&K 747 tube tester, and I am replacing them with newer examples. However, I wish to maintain their 'type' - i.e. electrolytics replace electrolytics, plastic films replace plastic films, etc - so identifying their type correctly is of paramount importance to me. LEFT: marked 0.047uF on schematic, I think it's a polyester. RIGHT: marked 0.01uF on schematic, I think it's a ceramic disc. Also, are both caps P or NP? It is not clear from the schematic - I think that they're NP though. Anyone? __________________ jitter critter.

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14th December 2006, 08:57 AM	#2
Nordic diyAudio Member Join Date: Sep 2005	the .47U can be replaced with a polypropylene cap just make sure to not go below the 250V rateing. The ceramic should at least be replaced by a C0G or NP0 type ceramic, or silver mica if you can afford those. just check where you took it out what voltages are there... I thin kthe green dot at the top is a code for 500V