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Old 21st February 2009, 05:28 PM   #1
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Lightbulb Preamp for Power Follower 99

I'm have finished building the "Power Follower 99" (5Abias , 81v, 100Wrms)
Now i'm looking for trasistor or tube (maybe) "voltage preamp" for it (or how it's called on eng.)
*Sorry 4 my eng. Tnx.
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Old 21st February 2009, 07:44 PM   #2
PMA is offline PMA  Europe
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I wonder what kind of cooling system you have used. Heat pipe?
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Old 21st February 2009, 08:08 PM   #3
Luke is offline Luke  New Zealand
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Thats dissipating 800watts per channel
How many outputs and can we see pics of this amp and maybe a schematic:-)
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Old 21st February 2009, 08:59 PM   #4
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Water cooling system, Thermaltake waterblocks & pump and ProModz 360x120mm radiator
450W off dessipating power
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Old 21st February 2009, 08:59 PM   #5
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Quote:
Originally posted by Luke
voltage seems kinda high for 100 W, is it +/- 40V, or are you dissipating 800watts per channel
How many outputs and can we see pics of this amp:-)
This scheme has "virtual ground operation" and uses +81v input, but in rezult, it have +-40.5
If there is a 800watt of power, mofets will burn
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Old 22nd February 2009, 11:19 PM   #6
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Shematic is in attachment. Case type - TO247. Every mosfet's gate have a feerite "bead"
What with the preamp scheme? Could you give me some?
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Old 4th March 2010, 09:21 AM   #7
GoranB is offline GoranB  Poland
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maybe you already built an preamp for power follower till now, im useing andrea's pre amp with tubes. It sounds great on midrange and high, bass is not controled well. I can sugest you to connect PF 99 to direct source, you'll get the best results that way
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Old 9th March 2010, 06:28 PM   #8
GoranB is offline GoranB  Poland
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Maybe here you can find some interesting sschematics for your power follower (tube designs)
HeadWize - Project: Top-Level OTL Tube Headphone Amplifier by Andrea Ciuffoli
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