DavidR
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Posts posted by DavidR
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3 hours ago, Stimpy said:
Thanks! 👍
ALL nasty solvents. Wear nitrile gloves at the minimum and a respirator with carbon cartridges and/or work outside.
Beware that acetone has a flash point of 0'F. I believe Nitrol thinner is a mix of xylene and methyl benzene. Toluene will pull fat out of your system right thru the skin and attacks all organs.
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Roy, I did find it odd that the 032 tweeter and AR91 and 92 don't appear on that 1986 parts list. At least I was unable to find it.
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I took a look at the1986 parts list in the library here and couldn't find anywhere it mentioning replacements.
I do have this on my hard drive:
Logic would say its the other way and I believe your previous post(s) state this as well. Also Carl measured the resonance and the 028 has 1/2 the resonance of the 032. The 028 won't play low enough for the AR91 and 92 and the 032 could burn out the vc if used in an AR9 or 90 when played hard.
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Stimpy, doesn't the 032 only have ferrofluid on one side of the VC ?
I want to know how they keep it on one side ........
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At some point we
maywill be forced to accept a swap or one of the replacements I linked above.It's inevitable.
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47 minutes ago, teknofossil said:
I guess that would require measurements after installation in the AR9 to determine whether or not it would be ok. If the higher freq rolloff of the 200028 was taken into account in the crossover design it is possible using the 200032 might result in a response rise in the lower mid to upper mid region. But, listening or even better response measurement would be the final word.
-T
I believe it was RoyC who broached this subject and tried an 032 in an AR9 and could hear no difference.
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17 hours ago, soundminded said:
Thanks David. I'm looking for an exact replacement. There are other AR midrange domes of the same size and similar type available but they aren't quite right. They are close though.
You're in luck!
Animal37 just posted a pair on eBay. Item # 334304399850
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@tenofossil
Its my understanding that the 032 can be used to replace a 028 but not the other way around.
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You can sometimes find them on eBay or the 200032 which will work.
I tried one of these and found it to be a very good replacement.
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12 minutes ago, AR surround said:
Traitor!!! LOL
I keep my eyes open for a pair of 3, 3a and 5 in C.L. and yard sales.
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Welcome to CSP.
Nice speakers designed by Ken Kantor.
I had a chance to pick up a pair thru Craig's List but have too many speakers and would rather try a pre-Teledyne pair next.
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Some times I think Ken's contribution to the audio world are overlooked. I remember when I used to frequent AudioKarma site --- many people didn't treat him too well. Perhaps they had no idea who he was.
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I did a Tempest Search for the unit in all the USA and Canada.
Sorry, but nothing came up.
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Welcome to CSP.
Those are some fine speakers.
Please see the PM I sent to you.
PM = Private message
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A short ride away from me. Hmmmm, do I need another pair of speakers?
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7 hours ago, mrhagerty2 said:
Not sure I get the connection between the volume control and a tube tester re: DE-oxit spray. ??
Tube testers have many pot switches they tend to have layers and some are plastic that is not compatible with deoxit. I don't know what's inside your volume control knob so I was alerting you to a possibility and to use caution. That's all.
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I'd go with the brass as some stainless steels are somewhat magnetic in the Martensitic family and, obviously, the Ferritic family of stainless steels. Austenitic stainless steels should all be good (and most pricey).
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The pots may be able to be flushed out with DE-oxit D5 spray. It is safe with most electrical components BUT I do know the old Sencore tube testers have trouble with a thin plastic material spacers in the switch components.
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15 hours ago, tysontom said:
Thanks. Victor did mention the powered version of the AR9 to me in a conversation once, many years after the fact. I later heard that it was Bob Berkovitz who had conceived of and promoted the powered design internally. Perhaps Victor had suggested the original idea initially and convinced Berkovitz? In any event, the design never made it into production though a prototype was made.
Tom
Because of your post on Victor's passing I found out he lived right down the street from me - just a few houses down. I knew Lillian as she walked her dog by our house (she recently moved). Had I only known. He had a nice pair of Allison 9s.
Do you know if Victor worked for Roy Allison? His business was in the next town over.
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Nice article.
Wasn't it C. Victor Campos who has originally wanted/suggested the AR9 to be powered speakers (internal amplification) ?
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Not a good idea to switch butyl for foam or the other way around.
Some say a surround has a 'break-in' period.
Foam surrounds are considered more compliant; however, each driver is designed for one or the other.
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Lately, all of the attachments and info in the Library are flagged by McAfee Antivirus as potential risks. What's up with that?
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PM sent
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50VDC equals approx 35VAC. All of the AR speakers I've worked on are listed in AC, but all are Teledyne/AR era. However, I have not worked on any of the older models like an AR5.
It does matter as speakers run on AC current. DC is blocked by a capacitor.
Recovery woofer Ar200003 "messed up
in Acoustic Research
Posted
Translation: Unfortunately it is true, they are all dangerous solvents, to be used with caution, with protective clothing or outdoors.
I worked in a coatings and printing facility and was the manager of 2 solvent recovery systems and a distillation system. Was also 'rewarded' with a dual role of EHS Manager. The problem with toluene is that they keep lowering the threshold limit value, over and over. So what was OK when I was working with it is now a dangerous environment.