earthsled

JBL 7126 compressor info?
« on: April 21, 2020, 03:24:52 PM »
I recently acquired a couple of these 1970s JBL compressors in non-working condition and I intend to repair and restore them. Has anyone come across this model before? I've found a few schematics posted online, but so far they have been totally unreadable. I'd love to get some info and opinions about this comp!

Here are a few images of the 7126 from an expired Reverb post:











Funny, it sort of looks like a DIY build inside!  ;D


« Last Edit: April 28, 2020, 03:28:32 PM by earthsled »


ruffrecords

Re: JBL 7126 compressor/limiter info?
« Reply #1 on: April 21, 2020, 06:46:01 PM »
I found this rather tatty doc you can download on the interweb.

https://www.eserviceinfo.com/downloadsm/54832/JBL_7126.html

Cheers

ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'

earthsled

Re: JBL 7126 compressor/limiter info?
« Reply #2 on: April 21, 2020, 08:30:52 PM »
Quote
I found this rather tatty doc you can download on the interweb.

Thanks, Ian!
This one is somewhat readable.

EDIT: Reposted in the GroupDIY Technical Documents
« Last Edit: April 21, 2020, 10:02:24 PM by earthsled »

earthsled

Re: JBL 7126 compressor info?
« Reply #3 on: April 28, 2020, 03:47:43 PM »
The non-working units arrived yesterday. I've done some basic testing and the power supplies seem to be in working order. These units came with 5901 microphone input transformers which is pretty cool. I'm probably going to set them up for line level, so I picked up some 5195 matching/bridging transformers to try.

It seems one VU meter might be fried. I've contacted JBL service, but the replacement parts are long gone. Can anyone identify this meter? It was made in Japan and measures about 2 3/8" wide by 2 1/4" high (JBL part number 39961). If I can't find an exact match, I'm sure I can retrofit something.





 

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