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 Post subject: Vintage and Antique... (Phase Linear)
PostPosted: May Sat 22, 2021 2:25 am 
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Joined: Jan Mon 27, 2020 3:46 pm
Posts: 144
Location: Wilderville, Oregon 97543
...can be relative. I'm trying to get a Phase Linear Autocorrelator 4000 preamp up and running I bought back in 1974/5. I have found many of the electrolytic capacitor are bad. Your old when you outlive electrolytic capacitors...


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 Post subject: Re: Vintage and Antique... (Phase Linear)
PostPosted: May Sat 22, 2021 1:11 pm 
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Joined: Nov Wed 07, 2007 12:44 am
Posts: 1484
Location: Kingman, Arizona
The name Phase Linear brings back memories as I bought a Phase Linear 700 amplifier in 1973 and sold it sometime in the late 80's when I decided that I needed a new amplifier. I remember that the amp had to have multiple power switch replacements as the switch contacts would weld themselves together periodically which is why I finally sold it. Harry


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 Post subject: Re: Vintage and Antique... (Phase Linear)
PostPosted: May Mon 24, 2021 2:54 am 
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Joined: Aug Tue 24, 2010 8:56 pm
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Location: Northeast Florida
The only thing I remember about Phase Linear was their power amplifiers. They were incredibly loud, and they also blew up a lot. Bob Carver ran those output transistors within an inch of their lives....

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William


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 Post subject: Re: Vintage and Antique... (Phase Linear)
PostPosted: May Mon 24, 2021 12:23 pm 
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Joined: Nov Wed 30, 2016 7:35 pm
Posts: 11518
Location: Sunbury, Ohio 43074
T he 4000 auto correlator suffered from many common ills. You can find them listed in a factory "common" troubles and cures list. IIRC I found it once on hifiengine.com. Unfortunately, many of the "Fixes" at the time were to just swap out one of the plug in cards... not an option today.

But a lot of issues were due to the plug in board contacts themselves. A good cleaning of all the pins might go a long way to getting it all working. Some of this device is sensitive enough that unless you've got test gear better than the preamp, you won't really know if you've got it working properly or not.

But it sure is pretty ;-)

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Preserving the hist. of electronics, one boat anchor at a time! :)
https://www.bbtvtestequipment.com


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 Post subject: Re: Vintage and Antique... (Phase Linear)
PostPosted: May Wed 26, 2021 2:18 am 
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Joined: Aug Sun 01, 2010 1:12 am
Posts: 8447
Location: Minnesota
tubes4life wrote:
The only thing I remember about Phase Linear was their power amplifiers. They were incredibly loud, and they also blew up a lot. Bob Carver ran those output transistors within an inch of their lives....

AKA Flame Linear


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 Post subject: Re: Vintage and Antique... (Phase Linear)
PostPosted: May Fri 28, 2021 1:26 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 11054
Location: Beaver Falls, PA. USA
Just try to fix a 400.

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 Post subject: Re: Vintage and Antique... (Phase Linear)
PostPosted: May Fri 28, 2021 6:21 am 
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Location: Sunbury, Ohio 43074
Tim Tress wrote:
Just try to fix a 400.

I've had the pleasure lol. Sometimes they are fairly easy to fix; sometimes the driver board is charcoal. Someone did actually come up with a replacement board iirc ....

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Preserving the hist. of electronics, one boat anchor at a time! :)
https://www.bbtvtestequipment.com


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 Post subject: Re: Vintage and Antique... (Phase Linear)
PostPosted: Jun Wed 02, 2021 3:13 pm 
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Joined: Jan Mon 27, 2020 3:46 pm
Posts: 144
Location: Wilderville, Oregon 97543
I agree, those edge connector have issues. All my edge connector problems were solved when I resoldered them to the boards and washed them with WD40 many decades ago. I did end up replacing all the RCA rear panel connectors with conventual screw mount type several decades ago. I used several pieces of brass angle to mount them to the mother board.

So, my restoration involved replacing all the electrolytic capacitors including all the 2.2uF and 1uF totaling around 60. I also removed all my modifications to the tape input/output circuitry. I also removed a relay that I used to mute the output when powering up and down. I did leave one mod in, the one that directly connected the "Phono 1" input to the RIAA amp using short coax. I found that switching between "Phono 1" and "Phono 2" with the selector switch introduce unneeded hum.

My goal was to get this preamp and the homemade turntable up and running and mount them in a cabinet. I made the cabinet using left over White Oak flooring boards when we had our floors done. Finish is Tung Oil. I used polished brass thumb screws to mount both. The output of the preamp drives a Logitech computer surround sound system connected to my shop computer. The Logitech system has direct inputs so that the Phase Linear 4 channel circuitry would be used. Got a few more refinements but the setup works great.

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 Post subject: Re: Vintage and Antique... (Phase Linear)
PostPosted: Jun Thu 03, 2021 2:31 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 198
Location: South Central Montana
All things Phase Linear

https://forums.phxaudiotape.com/

T.


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