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Old 29th December 2006, 07:18 AM   #1
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Default celestion 66 needs Mid-range

hello hopeing someone can help me , i have 2 celestion 66's very old but i love them , i need a new Mid-range speaker i think its a MD500 not to sure , ill have to take it out to be sure , i had it out just looking for loose wire's but no luck , anyone know where i can find one ? its sad to see them like this
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Old 20th January 2007, 09:29 PM   #2
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Impossible to find, i have a set of the 66's and i will never get rid of them........

I have resored my MD500 myself completely disasembling the entire unit....re-glue, coating etc.

I got to say WoW........

THE USED REPLACMENTS U MAY FIND WILL BE DEGRADED TOO...


This was alot of work but well worth it, it is very delicate work and if you make a mistake it's over ;-).

I also found NOS stock diaphrams for my 2000's tweeters....lucky.

This speaker is a very rare and sounds BBC +
Family are professional musicians.........they would agree....

If you need some advise i'll try to help!

cheers
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Old 10th March 2007, 10:07 PM   #3
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Hello,

Did you solve your mid driver issue in your 66's ?

I will take your broken mids off your hands if you still have them?


Thanks,
ToneDef2
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Old 11th March 2007, 12:30 AM   #4
Grahame is offline Grahame  United States
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Hi All,

This thread / forum is just what I've been looking for.

I grew up in the prescence of a pair of Celestion 66 Studio Monitors, thanks to my father being an audiophile (my mother still has them).

I was lucky enough to aquire a pair second hand in the late eighties for the sum of 100 pounds - I was visiting my father and he had noticed another pair for sale in the local paper. I had to have them - the previous owner had to let them go as his wife had said they were "too big". They have followed me around ever since - even here to the USA - and I haven't felt inclined to change them.

Recently I've noticed a "buzzing" on one of the mid range drivers , on certain tracks / material , at moderate to loud levels. Low levels seem to be ok, thankfully.

After much research I've ended up here. I've had a look for obvious failures, re-seated wires / swapped drivers between speakers etc.

Looks like I have the same MD-500 issue as tonedef2.

Is it an age related issue (the interior of the cabinet shows a build date of 1970! - almost as old as me ) ? - I ask as I've just seen some NOS MD-500's on ebay - for more than I paid for the speakers.

Being a cheapskate at heart - what are my options?
Is it likely that the issue will occur on all drivers?

Is it worth replacing the crossover + wiring - or just a mechanical issue with the driver.

Your thoughts are welcome from a fellow brit ex pat 66 lover.

Regards
Grahame

Your thoughts are welcome.
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Old 11th March 2007, 12:43 AM   #5
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Hello,

Well search my other posts, i no longer have the problem! ;-)

Read those before i say anything else.......
Yes i have owned mine for 23 years too! love these things.
Anyway read my other posts.....yes your buzzing is the classic failure, gets worse as the volume goes up.


TonDef2
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Old 11th March 2007, 01:56 AM   #6
Grahame is offline Grahame  United States
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Hi tonedef2,

I've searched all your other posts, and it would appear the solution to my problems is, ulp, to re-build the MD-500's.

When investigating the problem, I got as far as removing the faceplate (taking driver out of cabinet, removing collar / speaker guard - essentially unscrewing any visible screws )

A 500Hz reference tone from Alan Parsons "Sound check" would get the buzzing going nicely, in a repeatable manner as you raised the volume. Placing a finger gently at the edge, between the dome and the metal casing would calm the resonance - not a general solution.

I was not inclined to investigate further, as I was not confident that anything else I tried would be reversible!

How complex was the rebuild? What tools did you need? How feasible for a layman?

It looks like you are my only hope!

Grahame
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Old 11th March 2007, 03:32 AM   #7
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Hello,

Stop! do not power them with the large plate unscrewed! Coil insulation is a question and can short your amplifier under certain conditions…



Well I’ll type up a guide in the next couple days ( time permitting) and add some pictures I took as well.

From what I learned in this process, on this design, even NOS stock will fail as well due to the type of glue and application.

Note: This process is not for the faint of hart my custom jig was trial and error...my large 7 inch mag/light was a must have....
For one example, material had to be trimmed as over time it had stretched; very scary work as there is a cancellation dome with little margin right behind the second dome stage.
I believe you have the first gen of the 66’s?

If you have a digital camera to take pics of how bad yours are, this will help....

O and yes my mids are very very nice now……..well worth the work!
I must admit I do love the “tuned by ear” sound of these, very happy my family kept them for me………

Until later...I may hire myself out for this but I am short on time these days and well you know…..it’s a lot of work and time consuming in the sense of waiting for material to form shape, product to cure etc…………………


Anyway I will endeavor to help you.
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Old 11th March 2007, 09:02 AM   #8
Grahame is offline Grahame  United States
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Many Thanks in advance.

Yes, I think I have the first gen 66's ( I've seen some 662's on the web with two piece cover). Mine has HF 2000, MD 500 , 12" + passive radiator , all in vertical line, single piece grill / cover for cabinet. Big Thick Cross over circuit board , complete with signed off QA sticker! +

"Celestion | 66"
"------------------"
"Studio Monitor"

Badge at top of cover.

Serial # 116400 on back.

I'll wait and see if its something I feel capable of / comfortable with, when I see your step-by-step.

Judging by what I found when searching on the web, many others may have this issue, as the MD-500s start to reach end of original life. Who could have envisioned that when they were built, 30 - 40 years in the future, they would still be going strong? and still be loved?

Thanks once more, for sharing. At least I know there is hope.

Your help is greatly appreciated.
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Old 11th March 2007, 09:29 AM   #9
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Bought mine in 1973; no serial numbers !
Did not like the 'honky' dome sound, much prefer cone.
Took the midrange domes out soon after, and dropped in 6.5" full range.

Tweeters very fine though.
Bass drivers good; nearsest I've come across is Monacor 300 with 18Hz Fs.
Don't like ABR sound, not well enough controlled even when amp has very low output impedance.
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Old 11th March 2007, 09:39 AM   #10
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How many Ditton66 threads are there ?
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