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sfoster137

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Everything posted by sfoster137

  1. Thanks for the above information on the woofer...very interesting.
  2. 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
  3. 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.
  4. Looks like a wax block. Much, much larger to the one I replaced in my 2ax...which measured quite out of spec.
  5. 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.
  6. 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.
  7. 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
  8. 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!

    a25 new.jpg

    a25 old.jpg

    1. Pete B

      Pete B

      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.

    2. sfoster137

      sfoster137

      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.

    3. Pete B

      Pete B

      I don't know where anyone made that comment but they are wrong it is 1.0 uF.

  9. Yes, JKent is fantastic. Helped me quite a bit with an AR-2ax project.
  10. 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
  11. Thanks JKent...appreciated. Will likely open them up soon, depending on the project list.
  12. 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.
  13. Thanks Norman, that just makes too much sense Will try it.
  14. 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.
  15. 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
  16. Hello All, I just picked up a pair of Model 5's from an estate sale. The cabinets don't appear to match in stain color, which I would like to try and correct. Would a darker Howards Restor-a-Finish on the lighter cabinet work or is there a better solution out there? Thanks as always for your input. -Steve
  17. Thanks Lakecat for helping get me there! Just picked up new caps for the crossover…going all in.
  18. So I think the cabinets are done. Four coats of Minwax Polycrylic Satin. Now on to cleaning up the grills. Trying to dab them with Oxiclean solution is taking time as I just chase the drying ring (probably tobacco) to the edges. It might be better to remove the cloth entirely and soak it but that looks time consuming as well. I have purchased another alnico woofer so looking forward to that. Coincidently I gave my son a project this summer to build some speakers stands. I had him work with knotty pine for his first test pair. We were going to stain them but now I might just finish to match the AR cabinets.
  19. Yes I used blades. They were the longer break off type, so perhaps not as sharp. Thinning the paint did help on my second effort. A scrape and then a bit of hand sanding to taste. I'm liking where I'm at now, with a bit of a wash. The cabinets pop a bit more, some imperfections are hidden and the dark lines are not as visible. The grain edges can be subtle or brought out with sanding. In the attached picture the cabinet on the right has the wash and the left does not.
  20. Thanks Lakecat. Just tried my first paint application. Didn't go so well as scraping wouldn't remove enough of the paint so had to sand...which reversed some of the bleaching effect. Glad I just did this on the bottom of one cabinet. Attached is prior to paint, post scrape (kinda cool), and post sand. Perhaps I didn't thin the paint enough. Also may look at some whitewashing videos. And yes, water based poly:)
  21. Two bleaches with chlorine concentrate and I feel I'm close to the finish I'd like. The darker streaks are still visible so will investigate painting and scraping as per Lakecat. Considering a couple coats of satin poly to bring back some grain and evenly darken back down a bit. Thanks again for the many helpful contributions to this project!
  22. Thanks for the great information Genek, all options for finishing are definitely on the table. While stripping the dark walnut stain the cabinets got lighter which also looked nice. I've just applied a more concentrated bleach as a test to one of the bottoms and am liking what I see. The yellow hue has noticibly brightened and the dark streaks are disappearing. I'm going to let it sit for a couple of days while out of town. Then sand when I return to see what results.
  23. Hello Lakecat. Thanks so much for your earlier thread on stripping these cabinets! I certainly wouldn't have tried doing this without it. As you see from the picture I do have the dark streaks and also a bit of dark areas that make it look dirty (this is the worst side). I have beached 3 times followed by a light pressure orbital sand at 120 grit. I would like the finish a bit lighter and cleaner still. My wife's cheap laundry bleach is probably diluted so am going to try a more concentrated solution. I've been applying with a soft brush so am also going to try something stiffer. Maybe a heavier sand as well. I've been taking it slow and easy so far. The finish is certainly growing on me! -Steve
  24. Progress update..one cabinet stripped and sanded. There wasn't any finish over the stain or the job would have been more messy. Unlike the 3a in pine with the solid birch nosing the 2ax has the thinnest of veneers on the nose. Gentle sanding and trying to prevent catching on a cloth will hopefully keep it intact. On to the bleaching process to lighten the wood.
  25. Thanks IARrybody. I found the other thread from Lakecat. Very cool. Well, I learned a ton from my first receiver repair and recap, a Harman Kardon 730. I've done a few other makes since and ironically that first job was the most difficult. With that in mind I'm off to Home Depot to get some stripper and plastic scrapers. -Steve
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