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04-21-2009, 02:01 PM
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Junior Head-Fi'er
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Join Date: Apr 2006
Posts: 25
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SOHA JISBOS as preamp
Hi folks,
Is it feasible for me to use my SOHA + JISBOS as a preamp for my speaker amp?
any things that i should watch out for?
Regards,
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04-21-2009, 07:11 PM
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AMB Laboratories
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Join Date: Apr 2004
Location: Sunnyvale, CA. USA
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Aside from the gain being a bit too high, I don't see why it wouldn't work. The usual power-up and power-down sequencing between preamp and power amp applies.
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04-21-2009, 08:16 PM
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500+ Head-Fi'er
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Join Date: May 2007
Location: Central NJ USA
Posts: 551
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Yes, as amb suggests, if your amp is capable of passing DC then any offset from the preamp will be multiplied & sent to your speakers. I lost a pair for FE126Es that way...
So think ε12. Although you might always get pwr on/off seq right, someone else may not.
Other than that you may not be entirely pleased w/the results WRT gain (as amb noted), impedance, etc.
__________________
Current: Work: Sony D-777 (or Gen 5.5 iPod) -> Compact Tube Hybrid (CTH) -> DT-880 (2003)
Home: Rotel RCD-961 -> Budget B22 -> modded Denon D2000s
Past: SR80, HD580, HD595, K701, SOHA, Mini3, 40GB 3 gen w/DIYMod done
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04-22-2009, 05:27 AM
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Junior Head-Fi'er
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Join Date: Apr 2006
Posts: 25
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thanks for the advice guys.
what is this power on/off seq ?
turning on the pre-amp then amplifier?
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04-22-2009, 05:32 AM
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Member of the Trade:
AMB Laboratories
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Join Date: Apr 2004
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Turn on: preamp first, then power amp.
Turn off: power amp first, then preamp.
This is a good idea for most separates, especially a preamp with tubes because it takes the tube time to heat up and stabilize. Preamps and amps with built-in muting delay are excepted, if the time interval is long enough.
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04-22-2009, 10:28 AM
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Junior Head-Fi'er
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Join Date: Apr 2006
Posts: 25
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okies
thanks for the advice 
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