HELP! Capacitor specs for Sonic Frontiers SFC-1 Control Amplifier - diyAudio
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Old 17th November 2011, 01:17 AM   #1
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Default HELP! Capacitor specs for Sonic Frontiers SFC-1 Control Amplifier

Hey Gang....I have a Sonic Frontiers SFC-1 Control Amplifier (4x EL34, 1x12AT7, 2x12AU7) that requires new main caps (circled in red on the attached pic).

While I have the voltage specs for these (450v) I have no idea how many uF.

There are no spec markings on the exterior of these huge can caps, save for a manufacturing number of 658 9302 319.

Anyone out there have any experience with these. Lots of owner's manual information but no service manual or schematics.

Thanks Leo
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Old 17th November 2011, 05:37 PM   #2
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hi, may I ask what makes you say it needs new main caps?
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Old 17th November 2011, 06:29 PM   #3
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Gets the typical "thump" at speaker output after startup delay (signal output for five seconds) and then thumps again cutting out one channel, then another thump cutting out the other channel.

That seems to tell me the caps are energizing and discharging too quickly on startup and then losing whatever capacitance they have entirely. Yes ? No?
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Old 17th November 2011, 06:55 PM   #4
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Call or email a tech at Parts Connexion. They do mods on the Sonic Frontier units.
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Old 18th November 2011, 02:32 AM   #5
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Thanks...got an e-mail from Chris Johnson but these caps remain a bit of a mystery...they are guessing somewhere between 1200-1500 uf at 350 volts but as these puppies will be tres-expensive I would like something a little more definitive. I know I can up the voltage capacity without any harm but the uf ratings would seem to be more critical to determine exactly.
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Old 18th November 2011, 02:47 AM   #6
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The cap value in uf isn't critical 1200-1500 uf range is fine. These caps would be less than $20.00 each at Digikey. I'd do the rest of the smaller electrolytics at the same time. Try to find a 105 C cap for longer life of the same value and physical diameter. Panasonics are a good bet.

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Old 18th November 2011, 03:02 AM   #7
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Thanks..when you say 105c are you talking about the temperature rating?
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Old 25th January 2012, 04:35 PM   #8
Braga is offline Braga  Portugal
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Hi,
They look exactly the same as the SFS 40 power amp. main caps.
Value is 1700uF/300 V x 2 in series.
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Old 25th January 2012, 05:26 PM   #9
DF96 is offline DF96  England
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Sounds more like protection circuitry than reservoir caps.
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Old 25th January 2012, 09:40 PM   #10
Jebem is offline Jebem  Portugal
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Try Anthem - I believe they own the old Sonic Frontiers brand.
About Anthem - Welcome to the New Official Anthem® Audio Video Website.

they have the operator manual for download as well:
http://archive.anthemav.com/OldSitev1/pdf/sfc1.pdf
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