hello i need some help please

[rigers24]

these are some crossover from ruark sabre mk2 speakers .

i need some help on choosing upgrade parts so i can rebuild them and sqeeze out some more performance :)
137491375013751

[walpurgis]

Hi Matthew. Welcome to AOS.

You've not gone about this quite as expected. In the joining guidelines you'll see that we like an intro from you telling us a bit about yourself and your Hi-Fi system. You can tell us about your music likes as well. Please add more info. Thanks.

I see you've started a thread in Blank Canvas about your speakers. Good move.


Enjoy yourself here,
Geoff.

[YNWaN]

The large component is an inductor, the two blue ones are capacitors and the three rectangular grey ones are wire wound resistors. The component values of the capacitors and resistors will be written on them.

[Eagle owl]

Hello and welcome Matthew.

Geoff. :wave:

[Desmo]

[QUOTE=rigers24;610119]these are some crossover from ruark sabre mk2 speakers .

i need some help on choosing upgrade parts so i can rebuild them and sqeeze out some more performance :)

You will get a lot of different opinions, but for what it's worth I'd replace the resistors with equivilent value Mills resistors (the resistance should be exactly the same as the printed values on the ones in your crossover - but the same or higher wattage is OK). I'd also change the capacitors for something like the ClarityCap ESR or MR range (depends on how much you are prepared to spend) again it's important to get the correct capacitance value as printed on your original caps, but the same or higher voltage is OK). I'd probably leave the inductor as it is at the moment.

Hope that helps.

[rigers24]

hello members my name is matthew im 31 from lowestoft (uk)
ive been into hifi since i was around 13 of and on

my setup as follows .
Amplifier---- yamaha A-s500
Cd ----Technics SL-P770
Equaliser --- Technics SH-GE70
Turntable --- pro Ject Debut mk3
Phono Preamp - - Little Bear T10-Pro 12AX7
Headphone - preamp --- Little Dot Mk3
Speakers --- mission m33i , Ruark sabre

[rigers24]

I would also like to mention that i have a rogers ravensbrook amp that was modified by a guy on this forum . Thats how i found this forum trying too find out whats been modified on the amp cant remeber his username something tubeHunter

[YNWaN]

You will get a lot of different opinions, but for what it's worth I'd replace the resistors with equivilent value Mills resistors (the resistance should be exactly the same as the printed values on the ones in your crossover - but the same or higher wattage is OK). I'd also change the capacitors for something like the ClarityCap ESR or MR range (depends on how much you are prepared to spend) again it's important to get the correct capacitance value as printed on your original caps, but the same or higher voltage is OK). I'd probably leave the inductor as it is at the moment.

Hope that helps.

That's what I would recommend too.

[walpurgis]

I would also like to mention that i have a rogers ravensbrook amp that was modified by a guy on this forum . Thats how i found this forum trying too find out whats been modified on the amp cant remeber his username something tubeHunter

We do have a member with that user ID Matthew. If you look at the top of the homepage you'll see the 'Community' dropdown list. The member list is in there. You can send him a PM (personal message) about the Ravensbrook if you choose (assuming it's the right guy).

[rigers24]

here are the list of caps and resistors

expotus 11w 3.3 ohm J
'' '' 10w 10 ohm j
'' '' 10w 4.7 ohm J

you say use mills as they are good ( are they wire wound resistor or non inductive resistors


also the caps i have no idea what they are im puzzled

ALCAP 8mfd , 50 vnp 10 % LL

ALCAP 12 mfd , 50vnp 10 %


can anyone help what sort of caps and resistors they are

[Desmo]

You have sort of answered your own question:

the Caps are 8 mFarad, 50 volt (non polarised) with a 10% tolerance i.e. 8mfd +/- 10% (I'd replace with closer tolerance)
and 12 mFarad, 50 volt....

The resistors are:

3.3 ohm rated at 11W with a 5% tolerance (that's what the J tells you)
10 ohm rated at 10W
and
4.7 ohm rated at 10W

Just replace all of them with 12w Mills type. which are also to 5% tolerance

[rigers24]

is mfd the same as uf

[struth]

mfd is millifarad and uf is microfarad....1/1,000th and 1/1,000,000th

[rigers24]

so 8mfd is 8uf ?

[struth]

8 mfd is 8000 ufd....unless my senility is getting worse :eyebrows: which is possible.

[rigers24]

so your saying if i have a 8mfd cap on a crossover i have to look for a 8000 uf cap lol ? im on parts ex and they dont even go that high

[rigers24]

the only cap they have at 50 v is 220 uf
im a being stupid here ?

[struth]

Here is some reading on the farad Matthew that I have looked up for you. I am a bit rusty these days .

http://en.wikipedia.org/wiki/Farad

[rigers24]

8 mFarad, 50 volt (non polarised)

can u tell me what that should be in uf please so i can work it out

[struth]

From the text;

1 mF (millifarad, one thousandth (10−3) of a farad) = 1000 μF = 1000000 nF
1 μF (microfarad, one millionth (10−6) of a farad) = 1000 nF = 1000000 pF
1 nF (nanofarad, one billionth (10−9) of a farad) = 1000 pF
1 pF (picofarad, one trillionth (10−12) of a farad)

thus 8 mf = 8000 uf

[rigers24]

explain that then clearly says 12 uf on the cap says 12mfd

http://www.ebay.co.uk/itm/330503581041?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

[struth]

can only say that is the way it used to work. mill means a thousand, thus a 1000 mm in a metre. micro or fancy u means a thousand thousand. they may be using the m as micro but they shouldnt be

[Desmo]

so your saying if i have a 8mfd cap on a crossover i have to look for a 8000 uf cap lol ? im on parts ex and they dont even go that high

I've never heard of a crossover with 8,000 uF capacitors! that is power supply territory.

So to keep it simple, I suggest you get a pair of 8 uF ClarityCap ESA and a pair of 12 uF ClarityCap ESA's from Falcon Acoustics as they do the exact values you want. I'd also go for their 1% tolerance matching option.

http://www.falconacoustics.co.uk/alcap-claritycap-solen-audio-capacitors/claritycap-capacitors-esa-250v.html?p=3

Yes they are 250v rated, but that's fine. They will also be quite bit bigger than the Solens but it looks like you have room on your crossovers.

Get the Mills resistors from HiFi Collective
http://www.hificollective.co.uk/catalog/-c-61_62_179.html

Hope that helps.
Graeme

[rigers24]

Thanks for all your help on the crossover