Quickie Capacitor Question

[Paul Joppa]

See this thread:

http://www.bottlehead.com/smf/index.php/topic,3538.0.html

:^)

[Jim R.]

Thanks, didn't see that.  I also didn't realize the Zo was 4k with pjccs.

Thanks,

Jim

[Lee Hankins]

Dan,

Why did you recommended the Solen SB270 (2.7uf 150v) caps for the quickie instead of the "normal" SY220 (2.2uf 250v) Solen caps, only $1 difference.

Cordially,
Lee Hankins

[earwaxxer]

Hi Lee - Cap choice is a big topic. Here is a link that many refer to when choosing caps.

http://www.humblehomemadehifi.com/Cap.html

cheers - Eric

[Doc B.]

Dan,

Why did you recommended the Solen SB270 (2.7uf 150v) caps for the quickie instead of the "normal" SY220 (2.2uf 250v) Solen caps, only $1 difference.

Cordially,
Lee Hankins

Just because they have a bit more capacitance for about the same price and you certainly don't need the higher voltage rating. The 2.2 250V was the original value spec'd just because it is a part we already stocked for Foreplay III. Though I haven't done the comparison myself, some say that the thinner dielectric in the cap with the lower voltage rating sounds a little bit better.

[boulos]

Would the SB270 Solen caps be a good choice for the Quickie 1.1 also?

[Paul Birkeland]

Sure, those are a great choice for the coupling caps.

[Moot]

If I want to try various output caps, do I want to stay with lower ratings (35v) or higher ratings (1000v)? Let's assume price isn't a consideration.

[Grainger49]

The Quickie power supply is 36V coming from the batteries.  The output capacitor will not see all of that for more than a second or 5 seconds.  Nothing higher is necessary.

But, the better film caps start around 200V.  Some are only available with a 600V rating. 

Just be aware how much larger film will be and use the lead length to your advantage.

[Moot]

Thanks, Grainger49! So I was guessing that the lower the voltage rating the thinner the dielectric, and the thinner the dielectric the better it sounds. It's good to know I can try out some of the fancy caps!

[Grainger49]

I don't know that thin makes for better sound.  The only thing I know you lose with higher voltage ratings is money and space.

In general film caps (usually thicker dielectric) will sound better than electrolytic caps (stock with thin dielectric) when in the audio path.