Help identifying resistor on KEF SP1052 dividing network (KEF Corelli)

[blownaway]

So, opened up a mint condition KEF Corelli speaker set. Manufacturing seems to be Mar-May of 1978 based on the stamps on the driver (1974), Dividing network and enclosure.

Everything looks in great shape, just looking to replace the Caps and spotted the resistor starting to fur out. W22, 3RO.

I believe the 3RO means 3 Ohm resistor. Is the W22 the wattage? Google tells me it's a type of wire-wound resistor.

What would be a safe wattage/power rating to not blow/damage the T27/B200 drivers.

Thanks in advance!

For anyone looking for the SP1052 dividing network photos:

 

[blownaway]

FWIW, the list of caps are as follows:

1) 30MFD/50V
2) 0.6MFD/50V
3) 3x 10MFD/50V
4) 3.3MFD/50V

(Total 6 Capacitors)

 

[Netlist]

Is the W22 the wattage?

These are Welwyn resistors and W22 is 7W. 3R0 = 3 Ohm
Here's the datasheet:

Hugo

 

[blownaway]

Thank you so much! so 3 Ohms, 7W, 1% tolerance.

 

[Netlist]

Yes 👍

 

[blownaway]

The closest I'm getting is 5% tolerance at that rating. I think that should be acceptable right?

 

[jeffreybehr]

I think what confused you is that you read the '3R0' as 3-R-Oh. '3R0' is a common way of abbreviating 'resistor 3.0 Ohms'.

 

[blownaway]

Aaah. Makes sense. Yes, I thought the O was Ohms or a tolerance rating. W22 was 'wattage' but it was super small for 22W.

 

[blownaway]

Quick question for the wise folk. Does this schematic align with the crossover? Anything I google, I keep finding this schematic online.

 

[Wieslaw Lipowski]

The schematic seems right.

 

[blownaway]

Thank you for that useful reference sheet @Wieslaw Lipowski ! Waiting on replacement caps and resistor for rebuilding this. Working on the Tangent Crossover in the meantime.

 

[Netlist]

The closest I'm getting is 5% tolerance at that rating

Is that resistor broken or out of spec?

 

[blownaway]

@Netlist It's getting a tad furry at one end. I haven't measured it yet.