34: Why using non-polar caps for C10/C11?

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22-Oct-2019 08:22 PM

Fabian

Fabian

Posts: 102

When I bought the Quad 34 upgrade kit de luxe from Dada Australia (just 5 years ago) it came with handwritten instructions to use non-polars for C10, C11, C16, C17, C77 and C78.

 

I understand this choice for the coupling caps C16/C17 and C77/C78 (will replace the latter with wire links anyway), but not for C10/C11. They just seem to be part of the power feed to the phono input modules and there orientation should be pretty clear.

 

Am I missing any reason to still prefer non-polar caps over polar caps in this place?

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23-Oct-2019 02:54 AM

EJP

EJP

Posts: 1669

A mistake, my apologies. I would prefer you had taken it up with me directly as the vendor.

EJP

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23-Oct-2019 10:29 AM

Fabian

Fabian

Posts: 102

Sorry EJP, I didn't mean to be pointy or to complain. I had actually thought about contacting you directly, but then I thought that there might be something to learn for the entire community.

I had bought one standard kit from Stefaan and one de luxe kit from you to revise my two Q34s. Back than I didn't imagine it would take me more than 5 years to finally start the revision of the second unit.

Also, I did not apply the standard kit 100% as delivered but mixed and matched some passive components and sockets. Since the second Q34 should be upgraded to the highest possible standards I try to pay attention to every detail.

Turning the question around, what could go wrong when using non-polars for C10/C11? I only see two potential disadvantages. First, non-polars tend to be bulkier than polars of the same capacity. No real problem, if space is available. Second, endurance data for non-polars is sometimes specified for inverted polarity every xxx hours. If this change in polarity never happens, performance may degrade faster than specified. Did I miss out anything?

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23-Oct-2019 11:07 AM

EJP

EJP

Posts: 1669

Nothing could go wrong really, you're just wasting a larger and more expensive 100uF NP where a polarized 100uF would have done.
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23-Oct-2019 11:40 AM

Fabian

Fabian

Posts: 102

Thanks a lot.
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