sfoster137
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Thanks for the above information on the woofer...very interesting.
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Thanks for this great story. I'm a drummer myself, my wife plays trombone, and my mom played piano. I'm looking forward to getting the 5's in shape and will keep my eye out for the proper woofer. I had one, but they wouldn't ship to Canada
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Thanks for this Roy. My local supplier (Parts Connection) here in Ontario has Solens in 2.0uF (x2 for the 4uF), 24uF, and 36uF (x2 for the 72uF). The 400Vdc PB series is about my budget. This should maybe be a new topic, but any advice on cleaning the grill cloth of stain? I tried to spot clean on my 2ax's and the stain just spread. So I removed and washed but they shrunk so much the fit too tight and they were fraying. I had some Guilford of Main (now Duvaltex) acoustic fabric leftover from making acoustic panels for my wife's yoga studio. I thought they turned out quite nice against the blond finish.
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Looks like a wax block. Much, much larger to the one I replaced in my 2ax...which measured quite out of spec.
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Thank you for the replies. This was just what I was looking for. I'll start the hunt for a proper replacement woofer and use the 2ax in the meantime. I am intending on replacing the capacitors and will consider the L-pads and tweeter rebuild. The drivers all sound good, though the one woofer I did get desperately needs a new surround. The pots are also terrible which further supports the L-pads. The pots in the 2ax's I refurbished were bad at first, but opening them up and cleaning really brought them back.
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Yes, just looking for opinions on going forward with this as AR-5 replacements are hard to find. The speaker does sound good and I’m enjoying a bit more top end than the 2ax’s I had. Same mid and tweeter as the 3a’s, I believe.
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I just picked up a pair of AR-5's in good shape but one needed a woofer. I had a spare AR-2ax replacement (foam surround) so thought this was perfect, as they both use a 10" woofer. From the magnet side the two woofers are identical. Well, I should have done some measuring as the frame around the 2ax is wider. The 5 is 10" and the 2ax is 11". Does it make sense to mount anyway and fill any gaps with Mortite to ensure a tight seal. The woofer won't be recessed but there's still clearance between the woofer surround and grill. Attached is a picture with a rough install. Thanks, -Steve
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Hi Pete,
I just did a recap of Dynaco a25's which included your 1uF mod. Luckily I have two pairs so could A/B with the an original crossover. As expected there is a very nice increase in the top end and the addition of "air" as you say. The original cap was 4.7uF. It measured 5.2uF when removed. I replaced it with parallel 3.3uF and 1.8 uF Jantzen Standard-Z caps.
Would you have a moment to quickly explain the effect of the 1uF cap? My electronics is getting better but I'd like to hear your thoughts.
Thanks very much!
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The tweeter level control provides some resistive attenuation. Remember/consider that a cap passes
high frequencies and the addition of the cap provides a path for the highest frequencies to in a sense
bypass the resistive loss. It can only lift the same amount that the resistors are attenuating so as you
turn up the level the effect will be less. You can bring the HF bypass to pass at a lower frequency by
increasing the size of the cap.
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Thanks so much for your reply Pete. I'm only seeing this now after a recent post I made concerning AR-5's. Yes, I've been reading about the bypass cap and this was a very obvious sonic change...not to mention the new 5uF film cap I also installed. I did read that some suggested the 1uF should have been .1uF and the "." was possibly omitted in the document. Perhaps you could confirm.
Thanks again.
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I don't know where anyone made that comment but they are wrong it is 1.0 uF.
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Yes, JKent is fantastic. Helped me quite a bit with an AR-2ax project.
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Hello, I picked up a pair of KLH Model Five speakers. They look mismatched as the stain colour is different. What would be best practices to darken the lighter cabinet to match the other. Thanks -Steve
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Thanks JKent...appreciated. Will likely open them up soon, depending on the project list.
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Thanks again to Norman for his suggestion. Here is the reply from Ohm President John Strohbeen; "Thanks for your inquiry. Unfortunately we do not have such schematics available any more. In fact, we are looking to work with some engineers who are interested in the preservation of the art and design of legacy systems like ours, so at some point we do hope to have them. It sounds like you have a nice project in front of you though. Send some pics in if you like, we always like to see folks enjoying their Ohm's." I will send them pics once I get into it.
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Thanks Norman, that just makes too much sense Will try it.
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Would anyone have a schematic or capacitor and resistor values for an Ohm Model L crossover? I wouldn’t mind knowing before opening them up. I understand the Model C2 may be the same. Thanks in advance.
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Okay, this job is finished! I found the original grill cloth looked very drab against the pine and was showing it's age even after washing. I had leftover Guilford of Maine Silver Papier from making acoustic panels for my wife's yoga studio so thought I'd try it out. I think it looks better against the pine finish. After the recap there was a change you'd expect in the presentation. Percussive instruments like acoustic piano had more liveliness in their dynamics. I also could now pull back the resistive pots for the HI and MID from being all the way up. Luckily the pots were in great condition when I opened them up for a cleaning. This was a great experience and I can't thank the contributors here enough! Next up, a pair of KLH Model 5's that I'd like to better color match the cabinets (have started another topic for advice). -Steve
