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KEF 104 aB

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KEF 104 aB

Postby hector smith » 21 Oct 2012 21:12

Any 1 know exactly what property's The resistors on this crossover are? crossover SP1065 from KEF 104 aB .
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Re: KEF 104 aB

Postby hector smith » 21 Oct 2012 22:45

to late
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Re: KEF 104 aB

Postby twbranch » 23 Oct 2012 12:12

3R0 means 20 ohms. If it has a k where the r is (3k0) its 30kohms.
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Re: KEF 104 aB

Postby hector smith » 23 Oct 2012 12:31

20.ohm????????????


WELWYN - W22 3R3 JI - RESISTOR, WW 7W 5% 3R3
Order Code:
9504966
Manufacturer Part No:
W22 3R3 JI
Technical Data Sheet (1.01MB) EN
Product Information
RESISTOR, WW 7W 5% 3R3
Resistance: 3.3ohm
Resistance Tolerance: ± 5%
Power Rating: 6W
Voltage Rating: 200V
Temperature Coefficient: ± 75ppm/°C
Resistor Element Material: Wirewound
Resistor Terminals: Axial Leaded
Resistor Mounting: Through Hole
SVHC: No SVHC (18-Jun-2012)
Approval Category: K BS9114-N001/KB CECC 40 021-002
Body Diameter: 8mm
External Length / Height: 22mm
Full Power Rating Temperature: 70°C
Lead Diameter: 0.8mm
Lead Length: 23.1mm
No. of Pins: 2
Operating Temperature Max: 350°C
Operating Temperature Min: -55°C
Operating Temperature Range: -55°C to +350°C
Package / Case: Axial
Power Rating at 25°C: 7W
Series: W22
Temperature Coeff. +: 75ppm/°C
Temperature Coeff. -: 75ppm/°C
Tolerance +: 5%
Tolerance -: 5%
Voltage Rating V DC: 200V.
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Re: KEF 104 aB

Postby cats squirrel » 25 Oct 2012 19:46

twbranch wrote:3R0 means 20 ohms. If it has a k where the r is (3k0) its 30kohms.


3R0 means 3 ohms, 3k0 means 3000 ohms (3k ohms). Please don't confuse people!
kind regards, Cats
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Re: KEF 104 aB

Postby hector smith » 25 Oct 2012 20:31

Thank you Cats.
I didnot want to be so blunt , but well put. Thank you. thats why i just posted the part spec.
I think he was trying to blow me up,or maybe just blow his own trumpet.
cheers hector.
.Ps
Im a bit scared of upsetting anyone on here, and I am trying hard not to bite at any wrong info or bad advice. A sensitive bunch, and very defensive.
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Re: KEF 104 aB

Postby cats squirrel » 25 Oct 2012 21:18

Hi hector,

I haven't any KEF104ab's of my own, but I have heard them, and liked them. I also built the crossovers, and used them into KEF B110 and T27. The 'extra' bits in the crossover network meant that the roll offs of the two units became more like modelling suggested, especially outside of the crossover region. I remember getting very close to the two units just mounted on a small baffle (part of a larger one) and not being able to say where the sounds were coming from, so good was the crossover. It may be worth upgrading your capacitors from those dubious quality bipolars, which, by now, may be showing their age!

Good luck. [don't worry about upsetting the odd fellow (or two) there will always be someone to back up your side of things. 8) ] Giving incorrect info, especially for valve circuitry, could be dangerous, so we have to be vigilant. [-X :D
kind regards, Cats
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Re: KEF 104 aB

Postby hector smith » 25 Oct 2012 22:18

Hay ,Cats.
I have done my cap's. thats my crossovers at the top of the page see ;weee jpeg. one done and one to do. since then I have completed and also replaced resisters , only one had gone but for the sake of £2.40 and a five minuet walk to MAPLIN'S I just replaced the four.Now both aB's are tip top and singing. And yes the cap refit did without any doubt change the tone and sondstage for the better. much better.

I have Nearfield Placement on the go with the units in mid position, to get good base response, Middle positioning is second in depth, and most often extremely acceptable, indeed some speakers with crossover complexity (or errors) will actually benefit from this positioning. so with a more three dimensional listen it's easy to notice the differences.. cheers.. Hector.
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Re: KEF 104 aB

Postby davidsrsb » 26 Oct 2012 12:08

It is very unusual for a decent wirewound resistor like these Welwyns to change value. I would expect the sort of abuse that could burn one of these to have fried the tweeters. I think you should check them with Holmimpulse or similar PC software before spending too much time on the crossovers
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Re: KEF 104 aB

Postby steve195527 » 16 Dec 2012 01:30

davidsrsb wrote:It is very unusual for a decent wirewound resistor like these Welwyns to change value. I would expect the sort of abuse that could burn one of these to have fried the tweeters. I think you should check them with Holmimpulse or similar PC software before spending too much time on the crossovers


When the tweetes in the 104abs go you don't need any thing to check them,they go open so all you need are your ears(they don't work!):-I own 2 pairs,with only 1 pair with working tweeters,was cheaper to buy a 2nd pair than what some clowns on ebay ask for the correct t27s!
Get em working right and you have to spend a fair amount to get anything new to sound anywhere near as good,I would also be surprised if the resistors have changed value to be honest
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Re: KEF 104 aB

Postby hector smith » 16 Dec 2012 17:09

hay Steve.
My 104aB's are fine now have been for over a month.
The t27's were ok it was 1 of my resistors.
All came good after changing the resistor closest to the output, I had already changed all 10 caps so just replaced the 4 resistors as well.
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Re: KEF 104 aB

Postby steve195527 » 16 Dec 2012 18:04

hector smith wrote:hay Steve.
My 104aB's are fine now have been for over a month.
The t27's were ok it was 1 of my resistors.
All came good after changing the resistor closest to the output, I had already changed all 10 caps so just replaced the 4 resistors as well.


what do you reckon to their sound?
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Re: KEF 104 aB

Postby hector smith » 16 Dec 2012 23:15

Tip top ma man.
I didn't expect to get them sounding as good the cap refit was well worth the time and money highly recommended, I have heard a few different pairs of aB's and probable all in the last 10 year could of done with recapping.
My sounds are not anything funky, A couple of old Rogers A75mk2's and a mm on my cheep tt, But it's made these Kef's sing. I would go as far to say that ,to my ears it sounds better than a pair of Linn Isobariks,lk1&lk2 with a lp12, and Asaka cart. nothing wrong with set up it was new in the shop, with a top notch listening room. May be I have just fell in love with my Hi-Fi. well love is blind,or deaf.
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