GS-401 Crossover components.
emm...@emmaco.com
As part of a rebuild, I thought it might be time to replace the crossover with high quality components (Dayton Audio Polycaps). And adds some new cables from the amp.
Wanted to replace all the capacitors and resistors. Left the coils but reoriented them to be perpendicular. Ira should have caught that.
Anyway, I thought you might be interested to see how the old components measured, which wasn’t too bad. Made everything 250 V, btw.
Old Erie Metalized Paper- Spec’d at 4.0 microfarads (150 V)- measured 4.6 and 5.2 microfarads (15% and 30% from spec respectively).
Old Erie Metalized Paper- Spec’d at 6.0 microfarads (150 V)- measured 7.4 and 7.0 microfarads (23% and 17% from spec respectively)
Old Elcap Electrolytic- Spec’d at 80 microfarads (50 V)- measured 85.3 and 87.0 microfarads (6% and 9% from spec respectively)
Old Elcap Electrolytic- Spec’d at 60 microfarads (50 V)- measured 64.3 and 68.0 microfarads
Old Elcap Electrolytic- Spec’d at 7 microfarads (50 V)- measured 6.6 and 6.8 microfarads
Modulohm Resistor- Spec’d at 1.8 ohm (9W)- measure 1.9 ohms and 1.9 ohms
Modulohm Resistor- Spec’d at 3.3 ohms (15W)- measure 4.0 and 3.9 ohms
So, what it worth the $250? I would say so. Probably just replace the capacitors next time. The 60 and 80 required a paralleled pair, which is a bit of an effort to install.
But all in all, they sound better. The input connectors are not magnetic by the way (I think they are aluminum).
Merry Christmas,
John
Pete Wilson
On Dec 8, 2022, at 4:56 PM, <emm...@emmaco.com> <emm...@emmaco.com> wrote:But all in all, they sound better. The input connectors are not magnetic by the way (I think they are aluminum).
toby45
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Berris Conolly
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emm...@emmaco.com
This is the stock input connector, so we all have the issue.
From: 'toby45' via Gale Audio <gale-...@googlegroups.com>
Sent: Friday, December 9, 2022 9:54 AM
To: gale-...@googlegroups.com
Subject: Re: GS-401 Crossover components.
Yes Pete, that is correct. You can get galvanic corrosion when mixed with oxygen in the air (aluminium oxide) which then creates a poor connection with the copper. I'm not sure how long this would take to happen though and some damp would be needed to accelerate the problem.
------ Original Message ------
From: "Pete Wilson" <pe...@kivadesigngroupe.com>
To: gale-...@googlegroups.com
Sent: Thursday, 8 Dec, 2022 At 23:56
Subject: Re: GS-401 Crossover components.
On Dec 8, 2022, at 4:56 PM, <emm...@emmaco.com> <emm...@emmaco.com> wrote:
But all in all, they sound better. The input connectors are not magnetic by the way (I think they are aluminum).
I believe aluminum and copper is a bad mix, metallurgically. If there’s any moisture with a dab of conductivity, a form of corrosion seems possible.
Anybody know, rather than having an idea??
My, those electrolytic kept nominal values well!
- Pete
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elicia boon
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elicia boon
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elicia boon
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elicia boon
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emm...@emmaco.com
I actually swept the connectors to see if this was a problem.
It wasn’t. They were fine. I’m sure you could replace them at the expense of the original look. Tested them against tube connectors and didn’t see a significant difference on the scope.
BTW, six months on the polycaps sound even better. A bit bigger, but you can make them fit.
John
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elicia boon
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