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Old 1st August 2020, 07:58 PM   #2471
Mikerodrig27 is offline Mikerodrig27  United States
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Originally Posted by hhhh View Post
Thanks AAM, a pair of Spectra 11s went for CDN$299 near me.
These Acoustats hit outside their weightclass when it comes to what they seem to sell for used. I bought my pair for $80. Of coarse they need a decent amount of repair work, they are cosmetically in good condition. I can see the real potential even with them not being completely fixed yet.
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Old 3rd August 2020, 05:16 PM   #2472
AcoustatAnswerMan is offline AcoustatAnswerMan  United States
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Originally Posted by Mikerodrig27 View Post
Do you have any information on the bias pots used on the spectra 11 boards? I would like to replace mine. The stuff they wipe on top has gotten between the dial and it's body which makes it very hard to turn.

Thanks!

Sorry, I don't have any specs on the trim pot, but it's a pretty generic style. You should find a replacement at Digikey or Mouser.
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Old 3rd August 2020, 05:18 PM   #2473
AcoustatAnswerMan is offline AcoustatAnswerMan  United States
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Quote:
Originally Posted by Mikerodrig27 View Post
Do you have any information on the bias pots used on the spectra 11 boards? I would like to replace mine. The stuff they wipe on top has gotten between the dial and it's body which makes it very hard to turn.

Thanks!

Sorry, I don't have any specs on the trim pot. However, it's a pretty generic style, so you should have no trouble finding a suitable replacement at Digikey or Mouser.
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Old 3rd August 2020, 09:46 PM   #2474
Mikerodrig27 is offline Mikerodrig27  United States
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Yes, the only thing I saw was 1k so I assume that is the only spec you need. I will order some if for some reason I strip these.
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Old 7th August 2020, 06:01 AM   #2475
GNWT1 is offline GNWT1  Canada
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I have had my Acoustats 6600's for a number of years and worked perfectly, however one of the speakers has very low output any ideas where to start? I do have replacement transformers, ultra sonic supply board and a high voltage board in reserve.
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Old 7th August 2020, 12:04 PM   #2476
Mikerodrig27 is offline Mikerodrig27  United States
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Originally Posted by AcoustatAnswerMan View Post
First of all, all Spectra 11/1100 used the wall transformer power supply. But there was a significant improvement to the supply, and it is essential that you make sure your set is updated to the latest design, before you go "upgrading" or replacing parts. It's easy to do with commonly available parts. See attached docs.

Attachment 864437
o
Attachment 864438

Attachment 864439
I updated the interface as described in the documents. The only change I made was switching the 470uf cap for a 1500uf cap. The bias incresed on both interfaces.

One interface now reads 46 volts and the other reads 78 with the pots maxed out.

What should be my next step? I was thinking of checking the voltage on both the interfaces part by part to see where the drop is. One thing I noticed is that one interface looks like it was built before the other. As in, it has older looking components on the board.

Thanks for all of your help. The speakers are starting to sound pretty good. I just need to get the bias up the rest of the way on the one that is still too low.
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Old 7th August 2020, 12:57 PM   #2477
john65b is offline john65b  United States
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When I had issues on my Spectra 11, I ended up changing that 8 pin IC (looks like an Opamp). You may just need to make sure it is electrically connected - take voltage readings pin for pin from common ground and compare to the other working interface (bias at 75v sounds about right). may just need to resolder bad 8 pin connection, as I dont think mine needed replacing after replacing it...just a bad solder joint
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Last edited by john65b; 7th August 2020 at 01:00 PM.
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Old 8th August 2020, 12:20 PM   #2478
Mikerodrig27 is offline Mikerodrig27  United States
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Quote:
Originally Posted by GNWT1 View Post
I have had my Acoustats 6600's for a number of years and worked perfectly, however one of the speakers has very low output any ideas where to start? I do have replacement transformers, ultra sonic supply board and a high voltage board in reserve.
The first thing I would check would be the Bias voltage going to both speakers. If you read above, the update that acoustat Answer Man suggested that I do helped to increase the bias voltage on the interconnects. I am not sure if the update applies to your speakers.
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Old 8th August 2020, 05:12 PM   #2479
Mikerodrig27 is offline Mikerodrig27  United States
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Quote:
Originally Posted by john65b View Post
When I had issues on my Spectra 11, I ended up changing that 8 pin IC (looks like an Opamp). You may just need to make sure it is electrically connected - take voltage readings pin for pin from common ground and compare to the other working interface (bias at 75v sounds about right). may just need to resolder bad 8 pin connection, as I dont think mine needed replacing after replacing it...just a bad solder joint
My next step is to pull the interfaces off and start comparing voltages on the two units like you suggested. I reflowed a lot of the connections just because I thought it was a good idea. I suspect I may have an issue with the diodes as that seem to be a common issue.

I may grab a few other parts to replace on the board for good measure such as the small 3300pf caps on the high volt side of the transformer. There are also some diodes on that side as well.
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Old 10th August 2020, 03:34 AM   #2480
Dallyboy is offline Dallyboy  New Zealand
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Quote:
Originally Posted by AcoustatAnswerMan View Post
It's not necessary to connect the panels, but unless you have a high-voltage probe, you'll have no way to verify if the bias supply is working if you don't have panels connected.

I don't see a great need to use a Variac to slowly increase the voltage. The power supply contains no electrolytic capacitors that would need to reform, as would be the case for other electronics.

My advice would be to connect the panels, apply AC power, charge 'em up for a few minutes, and play music to verify operation.
Hi Mr Acoustat Answer Man, I have repaired a few connection issues with the wires running to the panels from the supply on both 2+2's.
I then powered the speakers up and let them charge for a while.

On playing music I have found that one speaker has bass that is distorted and pops and its happing from all of its panels. The top two panels on this speaker sound fine for the mids and tops.

The other speaker is fine for bass, mids and tops.
But both speakers have a low sound output from the two bottom panels then the top two panels.

I have swapped the power supplies over and the issues move with it. What do you think maybe causing the above problems?
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