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Old 12th August 2009, 04:09 PM   #1
piwonka is offline piwonka  United States
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Default bugle capacitors....

looking at this schematic
http://hagtech.com/images/bugleschem.gif

it looks like C1 is the cap that's in the signal path. am right in assuming this would be the cap most affecting sound?

thanks.
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Old 12th August 2009, 04:33 PM   #2
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Howdy,
bad news, all caps are in the signal path effecting the sound.
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Old 12th August 2009, 05:31 PM   #3
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Lumba is right

All caps should be of highest quality (that goes for all RIAAs and other eq circuits)
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Free Schematic and Service Manual downloads www.audio-circuit.dk, Company: www.dupont-audio.com, Joint venture: www.DupontMantra.com
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Old 12th August 2009, 05:45 PM   #4
piwonka is offline piwonka  United States
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one thing i'm wondering.
caps c8 and c11 jim said should have short leads to keep inductance down. i swapped some jantzen zcaps in those positions by putting them on the underside (before i found that post jim made).
leads are maybe 2.5-3" long (but larger diameter than the other caps). what type of cap would be good to use there? the holes in the board are probably a half inch apart and there is not much room to put something there.

the rest of the caps are jantzen crosscaps with the exception of two being audiocaps because partsexpress was sold out of the crosscap in that size...

changing the caps really brought out the highs and cleared up the sound of everything, was just thinking maybe it could be a bit warmer...the caps probably only have about 4-6 hours of use so far though.
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Old 12th August 2009, 07:32 PM   #5
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can see no c8 and c11
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Old 12th August 2009, 07:46 PM   #6
piwonka is offline piwonka  United States
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right here.
http://hagtech.com/pdf/bugle.pdf

the little caps between the opamps...
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Old 12th August 2009, 07:53 PM   #7
taj is offline taj
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piwonka,

It sounds like you're using high voltage radial passive crossover caps for a low voltage active circuit. In my opinion that's a very large (and potentially expensive) overkill (which you're entirely welcome to ignore).

Most folks would use something like a Wima (or whichever brand you favour) MKP (metallized) or FKP (film/foil) polypropylene capacitors like these: http://www.wima.com/EN/fkp3.htm that are made for PCB mounting.

Polystyrene and silver-mica caps are also commonly used for that application if they are available in the appropriate value (tons on eBay).

..Todd
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Old 12th August 2009, 07:58 PM   #8
piwonka is offline piwonka  United States
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lol. yeah. i had the caps in hand and got carried away
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Old 12th August 2009, 08:10 PM   #9
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piwonka,
battery supply ensures clean power. You could increase the value of C7/C10 using some audio-grade type. C8/C11 should preferably be polypropylene.
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