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About JKent

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  • Birthday July 14

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    Appalachian Mountains of NJ
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    KLH Model Eight radios, classic American Hi-Fi, jazz, classic rock, C5 'vette

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  1. OK. Just for giggles I cobbled one together. It works.
  2. Roy was too polite to say it bluntly but your friend is wrong. Look at the AR-3a Restoration Guide, written by experienced restorers including Roy (THE resident expert) and johnnieo (an EE professor). Your fixed resistors threw things WAY off. You will be infinitely better off with L-pads. Kent
  3. JKent

    Old Allison speakers

    I think what you have are Allison AL120 speakers. I don't have first-hand experience with them but maybe other members here do. Here's a link to the brochure from 1989. http://www.classicspeakerpages.net/library/allison/other/allison_speakers_in_1983_an/allison_speakers_in_1989.html#previous-photo You can google "Allison AL 120" but there doesn't appear to be a whole lot of info. Kent
  4. Agree! One other option would be to add some external supertweeters. Kent
  5. JKent

    Old Allison speakers

    No good. Give them to me 😀 Seriously though. Welcome to CSP. Maybe you could post a picture of a whole speaker, preferably with grille off. Do you know what model number? Looks like they are floor standers and they are excellent speakers. You'll want to confirm that the woofer surrounds are good--they are probably rotted or just holding on with a gooey coating. They should probably be refoamed. Relatively easy to DIY, and we'll provide guidance, or you can send them to Bill LeGall at Millersound in PA for expert re-foaming. The other thing is you want to be sure your amp can handle a 4 ohm load. Many AV surround receivers are only rated for 8 ohm loads, maybe 6 ohm but 4 ohm speakers can damage the amp. Some receivers have outputs to attach an external power amp for the front speakers (my Onkyo does). So please give us a little more info and we'll be happy to help. Kent
  6. “Lambswool” is the shade. The fiber is linen. I was confused by that too.
  7. So, looking at capacitors in Oz, this page has 22uF and 33uF NPEs (both close enough) https://speakerbug.com.au/index.php?route=product/category&path=25_29 These are premium NPE 33uF https://speakerbug.com.au/index.php?route=product/product&path=25_80&product_id=918 These are very good quality film 22uF https://speakerbug.com.au/index.php?route=product/product&path=25_28&product_id=157 This place has Dayton film caps in 20 and 30uF. Many of us buy these from PartsExpress here in the US https://www.wagneronline.com.au/dayton-dmpc-250v-capacitor/570-new-products-for-june-2014/wn-archive-2014/new-products/971817/fl/ Here are some more NPEs. They're radial instead of axial. Doesn't matter https://www.wagneronline.com.au/non-polarised-capacitors/electrolytic-radial-non-polarised/capacitors/electronic-components/971895/fl/ IMHO the Daytons are overpriced down under. I'd either use the NPEs in the 1st link above, for about $6 per speaker OR the Jantzen 33uF NPE and 22uF film, for $28 per speaker. Or do some more research.
  8. Hey Steve You can "parallel" caps but there's no reason to do so unless you can't get the correct value. For example, if you can't find 30uF you can parallel 20 and 10uF. Some people add a small value "bypass" cap. Probably a waste of time and effort. Use the same value (uF) caps. You CAN (should?) use higher voltage. Never use lower. Is one car better or just different? Seriously, this is a can of worms. Use film caps for lower values and non-polarized electrolytics (NPEs) for higher values. Your 20 and 30uF caps could be replaced with NPEs. Different brands? Which is better, Ford or Chevy? yeah--looks like the switch is encasd in resin. Leave it alone if it ain't broke. btw--be sure to observe the polarity. Your red wire goes to woofer +, black to -. I'm not sure about the tweeters (sometimes they are reversed). Hope you made notes. The white oblong things are resistors and they don't go bad. Leave them. So this should be simple. Just cut out the capacitors and solder new ones in. Done. Kent
  9. The whole speaker is untreated. I'm selling them as-is 100% original (except the badges) in our local electronics store. Figured a restorer would want unmolested. Even so, they sound good. I did pull one grille (obviously) to take a peek inside.
  10. Welcome Bawsme If you are restoring AR speakers be sure to download the AR-3a restoration guide. Most of the information there is appropriate for all AR speakers of that era http://www.classicspeakerpages.net/library/acoustic_research/original_models_1954-1974/original_models_schematicss/restoring_the_ar-3a/ On page 17 of that booklet it says to use 18-count Wichelt lambswool linen from 123Stitch.com https://www.123stitch.com/item/Wichelt-18-Ct-Lambswool-Linen-Needlework-Fabric-27x36/59-135X For less valuable speakers, an acceptable cloth is the CharlesCraft Irish Linen Needlework fabric available at Michael's https://www.michaels.com/tissu-de-lin-irlandais-pour-le-travail-à-l’aiguille-charles-craft/10357706.html It is 28-count and thinner than the Wichelt. Also, although it used to be made in Ireland it's now from Poland. And the color (tea) varies from roll to roll. But it's $8 for a 20" x 24" roll and Michael's always has 40% off coupons, so for $6.40 it's not bad. I built a pair of speakers using some salvaged cabinets and inexpensive drivers. Wanted them to "look" like classic KLH or AR so I used the CharlesCraft (pic below). Kent
  11. Welcome Ho Short answer: Yes. I always loved the look of those Empire turntables. Guys on this forum like vintage gear and many have vintage 'tables, ranging from relatively cheap ARs (like mine) to setups like Frank Marsi's with crazy-expensive arms and cartridges. As I understand it, the arm on the 698 is low mass and compares very favorably to the SME 3009. Apparently the Empire headshells are proprietary and expensive but I'm wondering whether a turntable wizard like Steve Forsten or Marc Morin could modify the arm to take a universal shell. In any case, AUdioKarma may have more discussion about this. I'm no expert on the Empire but I believe you can (and should if the Audioquest is shot) use a modern cartridge. And although you're right that the sky's the limit there are many good choices under $500 and even under $200 from Grado, Shure, Ortofon, Sumiko, Audio Technica, Denon and others. Are you a MM or MC fan? MC carts are more but I'd like to try one again. Kent
  12. I kinda doubt it, but who knows? The linen fabric available from 123 Stitch is correct for most AR-3a era speakers (4x, 2ax, othrs) and looks right even on those speakers that originally had different cloth. And the AR-3 material is still manufactured by Mellotone. There may be some demand for the other styles but I'm sure it's limited. My 2a's have the material with gold thread. Cool for MCM fans but otherwise certainly dated.
  13. Great suggestion! Also, Home Despot has a very limited selection of heavy duty, double cartons for a coupla bucks each: Large 18 x 18 x 24 and Extra Large 22 x 22 x 22
  14. I think the consensus is that film caps are good because they last "forever." NPEs are original to the design. PE and Madisound sell NPEs. Some of our members speak well of Mundorf E-caps. https://www.partsconnexion.com/capacitors-ele-mundorf-e-cap-ac-series.html I have not tried them, but it's a consideration. -Kent
  15. Welcome Al W A very worthy rebuild and I know you want to do it right. I've never seen a 3 crossover like that, but then I've only worked on one 3. Some members more experienced with the 3 will undoubtedly chime in. Patience will be rewarded. Kent
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