Sonic Frontiers Line 2 - no line level output - diyAudio
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Old 12th August 2013, 02:52 PM   #1
diyAudio Member
Join Date: Aug 2013
Unhappy Sonic Frontiers Line 2 - no line level output

Hello all, I'm new to this group. I have a Sonic Frontiers Line 2 which I got a few years back, only 1 1/2 years old. The updated tubes burned out, so I put in the original Sonic ones which also burned out after a year. I was using the pre-amp as the main preamp for my stereo and by-pass mode for the surround, feeding my Mirage M-2's with mono/xlr from the Line 2 to OCM 200's. Well the tubes seem to burn out too quickly as the EPL loop is only able to run straight through when the Line 2 is on and after watching lots of movies ... well the tubes burn and I took it out of the configuration.

Back in again a year later and the right two rear tubes would not light up. Swapped L/R and same sockets would not light up. Put it away again.

Now I want to get it working. All the tubes now light up however:
1. no line level output from any unbalanced input (I don't have a balanced source)
2. no headphone output
3. After selecting unbalanced inputs, the display has crazy numbers for three of the unbalanced sources they each display 50 50; 75 75 and some other number and 0 0 for the forth one, so If I were to get output it would be real loud after
selecting the input.

Any ideas on how to trouble-shoot these ? Also is there a way to invert the EPL loop action, so that it is on straight-through with the Line 2 turned OFF (which is the way it should be).

Thanks for any help/advice.
(Burlington, Ontario, Canada)
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Old 13th August 2013, 12:59 AM   #2
diyAudio Member
Join Date: Apr 2004
Location: Monroe Township, NJ
Contact the folks at PartsConnexion. They are the survivors of S.F.
Eli D.
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Old 13th August 2013, 03:28 AM   #3
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Join Date: May 2011
Location: 100th Meridian
Hi...Good luck with Parts Connexion IMO....they were anything but helpful with my SFC-1 questions....product support is non-existent as are schematics....I know that some products in the Anthem line were based on earlier SF platforms....and schematics for these seem to exist.

But try Eli's suggestion first...nothing to lose...and failing that there are a few hands here at DiyAudio that might be able to steer you through specific diagnosis tests to help narrow down your SF's affliction.
"A problem left to itself dries up or goes rotten. But fertilize a problem with a solution--you'll hatch out dozens." (N.F.Simpson)
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Old 15th August 2013, 04:51 PM   #4
max426 is offline max426  United States
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Join Date: Aug 2008
Location: Pa. USA
I had the same issue with my line 2 about 6 months ago.
Try plugging and unplugging headphones repeatedly, this is what Chris Johnson from partsconnexion recommend.
It did not work for me, maybe you will have better luck.
I have the service manual and schematic if you want it.

I sent mine to partsconnexion for repair. They were very helpful and I had it back in less than two weeks including shipping time.

"This is DIY. I view op amps the same way I look at a can of soup or a fast-food burger" NP
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Old 15th August 2013, 06:09 PM   #5
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Join Date: Aug 2013
Jim, thanks for that. I have it in PCX now for repair. Chris and Mike have both been very committed and informative and will warranty all work for 1 yr. They also have a fix for the erratic display settings. They have just finished replacing my Anthem Pre 1's original power transformer (internal short) with a new torroidal one. Fast turn-around when you live in the same city ! I would highly recommend them for service.
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