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Old 12th January 2016, 01:43 PM   #1
Ggizzy is offline Ggizzy  United States
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Default Wharfedale W60 crossovers

Good morning,

I have a pair of very early Wharfedale 2-way W60s. The crossover is composed of an inductor, 12uf cap and 50 ohm l-pad. I have replaced both speakers' caps with 12uf motor runs.

When I received these, one of the speaker's tweeter wasn't putting out sound. When I opened the back up to replace the cap, lo and behold, I found that the 50 ohm l-pad had been replaced with a 50 ohm 1W or 2W potentiometer!

Obviously this needs to be replaced, but I'm wondering with what? It appears that the 50 ohm l-pads were unique to Wharfedale. I have seen crossovers on epay, but I don't want to fork over $60 for a single l-pad.

I had read elsewhere that it is possible to replace these with 8 ohm 50W mono l-pads. Does anyone have experience doing this? Will this change the response of the speakers or do incremental damage to the drivers over time?

Thanks for any help!
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Old 13th January 2016, 12:04 AM   #2
system7 is offline system7  United Kingdom
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I'm surprised no-one has helped you here, Ggizzy!

What most of us do when faced with a crackly old level adjusting potentiometer on a tweeter is to hard wire it at a fixed level with two 10W wirewound resistors.

Click the image to open in full size.

These things go by various names like ceramic, wirewound and sandcast, but are cheap as chips at around 1 a pop.

There's even calculators, for 16 ohms, in your case:
LPad Driver Attenuation Circuit Designer Calculator

Not rocket-science. Come back to me if you are still struggling with Ohm's Law an all that!

I'd really need to see the circuit to be more exact, but it's probably fairly straightforward. Resistors are resistors at the end of the day.
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Old 13th January 2016, 12:20 AM   #3
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Quote:
Originally Posted by Ggizzy View Post
Good morning,

I have a pair of very early Wharfedale 2-way W60s. The crossover is composed of an inductor, 12uf cap and 50 ohm l-pad. I have replaced both speakers' caps with 12uf motor runs.

When I received these, one of the speaker's tweeter wasn't putting out sound. When I opened the back up to replace the cap, lo and behold, I found that the 50 ohm l-pad had been replaced with a 50 ohm 1W or 2W potentiometer!

Obviously this needs to be replaced, but I'm wondering with what? It appears that the 50 ohm l-pads were unique to Wharfedale. I have seen crossovers on epay, but I don't want to fork over $60 for a single l-pad.

I had read elsewhere that it is possible to replace these with 8 ohm 50W mono l-pads. Does anyone have experience doing this? Will this change the response of the speakers or do incremental damage to the drivers over time?

Thanks for any help!
+1 to just replacing an L Pad it with regular resistors. There's nothing special abut an L Pad. Easy to measure with meter.

If you want to do something nice, I'd suggest the M&M combo. Mills 5 watt resistors and Mundorf MKP caps or M&A - Mills and Audyn

Oops, I guess Audyn doesn't make a 12uF cap, but you can get there by adding in parallel, or get another brand.

Or you can just spend as little as possible. But you may learn something.

Best,


Erik
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Last edited by eriksquires; 13th January 2016 at 12:24 AM.
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Old 13th January 2016, 12:38 AM   #4
system7 is offline system7  United Kingdom
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Amazing what I have in the system7 Wharfedale archives!

Click the image to open in full size.

Click the image to open in full size.
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Old 13th January 2016, 12:46 AM   #5
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Those are really great, Steve! It is amazing what technology we now take for granted, when once-upon-a-time it was an innovation.

I wonder if I can use the use of solder, or electron flow as a marketing tool.

"The SNR-1, featuring silver content solder longitudinally aligned with each connection for more vibrant sound. "
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Old 13th January 2016, 12:58 AM   #6
adason is offline adason  United States
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Real l-pad are two pots in parallel.
I would not use motor cap for crossover, just a suggestion.
Ed
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Old 13th January 2016, 01:01 AM   #7
system7 is offline system7  United Kingdom
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I like revisiting memory lane sometimes, Erik.

The tools available to engineers in the 50's and 60's were quite basic, but if you knew what you were doing with them, you could get good results. Smith Charts worked with antennas and filters. AVO meters were ace! And we could all do calculation stuff in seconds on a slide rule.

I miss the old Decade Boxes, where you could just dial in capacitor, coil and resistor values without needing to unsolder components and fit new ones. You really could tune by ear, which is what Gilbert Briggs and others did.

But really most of those old engineers could just do mental arithmetic and other stuff in their heads.
Attached Images
File Type: jpg Decade Boxes.JPG (24.5 KB, 79 views)
File Type: jpg AVO meter.JPG (40.6 KB, 80 views)
File Type: jpg Smith Chart.JPG (80.8 KB, 16 views)
File Type: jpg Slide Rule.JPG (47.9 KB, 14 views)
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Old 18th January 2016, 02:48 PM   #8
Ggizzy is offline Ggizzy  United States
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I apologise for not responding earlier. I had gotten caught up with another project and missed all the great responses. I have a few pictures here of the inside of the crossover. They are from the good speaker. I hope the quality is legible enough. I do not have a great camera on this computer.

The l-pad just appears to be a brightness control? I usually keep it almost nearly "up" or to the right/clockwise. I like more treble than bass for what I listen to. It's 50 ohm as stated before.

I also have a bunch of 10W value ceramic resistors laying about to use up!
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Last edited by Ggizzy; 18th January 2016 at 02:50 PM.
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Old 18th January 2016, 02:49 PM   #9
Ggizzy is offline Ggizzy  United States
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And the other since I can't seem to be able to post more than one picture at a time.
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Old 19th January 2016, 06:22 AM   #10
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Quote:
Originally Posted by Ggizzy View Post
And the other since I can't seem to be able to post more than one picture at a time.
Love that capacitor! Looks like the inside of an old tank.

Wonder what they sound like.

Best,


Erik
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