Bottlehead Forum

Bottlehead Kits => Legacy Kit Products => Reduction => Topic started by: Chris65 on December 10, 2013, 10:57:50 AM

Title: Reduction Kit - Missing Parts & Questions.
Post by: Chris65 on December 10, 2013, 10:57:50 AM

Hi Doc & co.
Just received my new Reduction kit. Unfortunately some parts were missing (the 0.1uF film caps) & an LED from the Integration kit.
I've emailed the replacement parts address & the Queen, but not getting any response (nearly a week).
I guess you guys are busy after the sales weekend, but was hoping to hear something, or will the missing parts just turn-up?

Been studying the manual, and was wondering if there was a reason for the paralleled capacitors in the amplifier circuit? Could they be replaced by a single 0.03uF or 0.033uF capacitor?

Title: Re: Reduction Kit - Missing Parts & Questions.
Post by: Doc B. on December 10, 2013, 11:12:12 AM

Sorry Chris, Eileen had not been able to get to the replacement parts emails yet this week. I believe you will find that she has responded in the past half hour.

Title: Re: Reduction Kit - Missing Parts & Questions.
Post by: Chris65 on December 10, 2013, 11:23:04 AM

Yes, she has. Thanks Doc.

Title: Re: Reduction Kit - Missing Parts & Questions.
Post by: Chris65 on December 11, 2013, 01:45:33 AM

Well, I'd checked all the major items in the kit, only left the bag of screws/nuts & other hardware.
Just went through the bag to check all was there, only to find several missing nuts!

If I could source them easily, I'd just buy locally but American thread sizes aren't common here so have emailed Eileen again.

Title: Re: Reduction Kit - Missing Parts & Questions.
Post by: Grainger49 on December 11, 2013, 02:23:23 AM

Chris,

In answer to the capacitor value question, they are in the RIAA Equalization circuit.  Changing to a single 0.033uF is 10% off, that is a bad thing.  But a single, better 0.03uF would work.  The Eros has a single 0.03uF that could be substituted with better stack of 0.01uF such as these:

http://www.ebay.com/itm/0-01uF-500V-5-AUDIO-teflon-capacitors-K72P-6-Lot-of-1pcs-/251307157913?pt=LH_DefaultDomain_0&hash=item3a8312e999

I don't know what is in the Reduction kit but you may already have better capacitors.

Title: Re: Reduction Kit - Missing Parts & Questions.
Post by: Paul Birkeland on December 11, 2013, 07:16:58 AM

Quote from: Chris65 on December 10, 2013, 10:57:50 AM

Been studying the manual, and was wondering if there was a reason for the paralleled capacitors in the amplifier circuit? Could they be replaced by a single 0.03uF or 0.033uF capacitor?

We use three 0.01uF caps in parallel because we already have the 0.01uF cap elsewhere in the EQ, they are available as a tight tolerance part (5%), and because 0.03uF caps are quite uncommon.

Using 0.033uf will bump the EQ around a bit, so it's not recommended.

-PB

Title: Re: Reduction Kit - Missing Parts & Questions.
Post by: Chris65 on December 11, 2013, 10:04:41 AM

Grainger, Paul

Thanks for the replies. Yes, I thought 0.33uF might be pushing it & as you say 0.03uF is not common, especially in the higher tolerance. Although there are some interesting Russian PIO 5% caps available in that size.
They are Dayton Audio caps in the Reduction kit Grainger.

Title: Re: Reduction Kit - Missing Parts & Questions.
Post by: Grainger49 on December 11, 2013, 11:12:09 AM

Chris,

The Dayton Audio are pretty good Polypropylene film caps.  Not cheap at all.

Title: Re: Reduction Kit - Missing Parts & Questions.
Post by: Chris65 on December 12, 2013, 09:37:37 AM

Thanks Grainger, I will be using those, a stock build at first.

Just hope I can get the my #4 nuts before Christmas, so I can make a start. ;D