4.7uf BG N in T-amp or Amp3 - diyAudio
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Old 12th July 2005, 08:33 PM   #1
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Default 4.7uf BG N in T-amp or Amp3

Has anybody tried 4.7uf BG N caps for the T-amp or Amp3 input coupling?

I want to upgrade the input coupling in my Amp3 but not sure what to order, Auricaps have had good reviews when used with T-amps but they are hard to source in the UK
Any recommended types to try would be much appreciated
I have a couple of spare 2.2uf standard M-cap and a couple of LCR MKP's.
I don't fancy fitting and removing the caps because the pcb track is fragile

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Old 13th July 2005, 06:22 AM   #2
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Default Caps

If you do use the BG caps and they are polarized the + lead must go to the chip. If you are planing to connect directly to input RCA jacks put a 100k metal film res across the jack so the cap will have a path to charge as well as suppling a DC load to the source.
Roger
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Old 13th July 2005, 07:59 PM   #3
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Thanks Roger
I'm hoping to get the Amp3 inside a small Hammond case soon, the only hold up is just deciding which caps to use

Leo
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Old 13th July 2005, 09:50 PM   #4
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Default Cap question

Quote:
Originally posted by t.
Thanks Roger
I'm hoping to get the Amp3 inside a small Hammond case soon, the only hold up is just deciding which caps to use

Leo

Leo,
I am against any kind of electrolytic in the signal path including BG's finest. I also think they are ripping people off with their high prices. Aside from that I have never actually done an A/B like what you are proposing. Please try both. This could be an interesting comparison. Please post your results.
Roger
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Old 13th July 2005, 09:59 PM   #5
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Ok matey
To be honest the only elecytrolytic I currently use for coupling is in my diy dac and thats a 4.7uf BG N, the ones in my tube amp etc are all films.
I wasn't sure if its advisable to use to many BG N's in the signal path
I normally like Multicap RTX, I have a couple spare but they are only 1uf, it seems 2.2uf is the recommended value.

The pair of 680uf BG NX I'm using on the Amp3's main board for the decoupling are sounding excellent though, certainly better than Panasonic FC,Nichicon muse etc I've tried
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Old 14th July 2005, 02:27 AM   #6
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Default Caps

Leo,
Electrolytics like having a voltage across them as the +/- fields exert a great deal of force to hold things together and a small ripple won’t disturb them much. If you do use one as a coupling cap and have no bias voltage the distortion can be quite high even with a light load.
As for the 1 uf value for the coupling cap, you probably won’t hear the difference unless you are using it for a bass amp.
Roger
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Old 14th July 2005, 01:44 PM   #7
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Try the 4.7uF “audio grade” polypropylene caps from Maplin electronics. I use them and am very pleased with the results. Better than standard 4.7uF caps. Cleaner and more dynamic sound and a reasonable £3.99.
See http://www.maplin.co.uk/module.aspx?...o=393&doy=14m7
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Old 14th July 2005, 05:59 PM   #8
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Thanks guys
I actually have a pair of those yellow 4.7uf polypropylenes from Maplins in the buffer section of my GC

I'll try and compare all the caps and see which sound best, I'm currently using 2.2uf M-caps which seem good
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