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Old 20th February 2015, 09:24 PM   #1
badtoby is offline badtoby  United States
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Default Threshold FET 9

Picked this up the other day. Would like to do some updating. Anyone have a schematic? I've seen some here about the 9e and 10 but not the 9. Any help would be appreciated.
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Old 20th February 2015, 10:00 PM   #2
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Old 20th February 2015, 10:24 PM   #3
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Quote:
Originally Posted by badtoby View Post
Anyone have a schematic?
Here: Threshold Audio FET Nine Manual - Stereo Pre Amplifier - HiFi Engine
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Old 21st February 2015, 12:14 AM   #4
badtoby is offline badtoby  United States
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Thanks zeonrider my manual does not have the schematic like that one has. So it looks like the supply that Gary B built for the FET 10 would also work here?
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Old 23rd February 2015, 12:26 AM   #5
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After reading the old threads on the FET 10 again I'm thinking of using the supply kit that 6L6 suggest in an old post http://chipamp.com/chipamp-power-supply-kit/

Also thinking of using the Antek 3218 300VA but I see that it has a max current rating of 8.3amps and the supply kit diodes are rated at 8 amps, will this be a problem? Also do I need the two thermistors and line cap before the transformer?
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Old 24th February 2015, 05:12 PM   #6
badtoby is offline badtoby  United States
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Have I posted this in the wrong place?
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Old 24th February 2015, 08:06 PM   #7
Zen Mod is offline Zen Mod  Serbia
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xformer - more VA , the merrier (only your wallet knows when it's overkill )

diodes will never see 8A through them with preamp's minuscule power consumption , so they're good

each primary having dedicated NTC is good thing , cap too
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Old 24th February 2015, 10:43 PM   #8
badtoby is offline badtoby  United States
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Thanks Zen Mod. I'll post photos when I'm done.
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Old 25th February 2015, 06:25 PM   #9
badtoby is offline badtoby  United States
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Anyone know what brand and size connectors were used on the power supply cable?
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Old 25th February 2015, 06:26 PM   #10
badtoby is offline badtoby  United States
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