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Old 8th December 2012, 04:46 AM   #621
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Originally Posted by Variac View Post
The PCB's are ordered and should be in the store within the month. We got expedited shipping and production.

I know this has been an incredibly long time, but we don't have full time people helping here at the forum or at the store and I have been swamped with work at my "real Job" Also, there were issues with getting the order right with the maker, which is really important !
goodie variac how will the pads be? same as other store boards?
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Old 8th December 2012, 05:04 AM   #622
Variac is offline Variac  United States
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The mounting is made to work with the UMS. If you remember in each kit there is a gainstage board for 2 ch that can be snapped in half, and 2 N ch boards, each with 2 MOSFETS and 2 diodes and 2 P ch boards each with 2 MOSFETS and 2 diodes.

-One kit spreads things out well for 2 ch (each with a P and an N output bd so 4 output MOSFETS per channel, 8 total) in the 5U x 400 chassis.

-One kit can use half the gain bd. and just one N board on one side and one P on the other in a 4U x 300 chassis as a monoblock. So one kit gives 2 smaller monoblocks each with 4 MOSFETS

-Two kits could make 2 monoblock 5U x 400 chassis' each with 2 P and 2 N output bds so 8 output MOSFETS per channel, total of 16 MOSFETS in two 5U x 400 chassis.

As far as diameter of pads on traces, well whatever Alex did...

Last edited by Variac; 8th December 2012 at 05:14 AM.
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Old 8th December 2012, 05:23 AM   #623
dazed2 is offline dazed2  Canada
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Cool Variac! Can't wait !

I know someone here probably asked already, but is it relatively easy to convert it to a balanced system by crossing a few grounds?
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Old 8th December 2012, 06:52 AM   #624
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Originally Posted by Variac View Post
The mounting is made to work with the UMS. If you remember in each kit there is a gainstage board for 2 ch that can be snapped in half, and 2 N ch boards, each with 2 MOSFETS and 2 diodes and 2 P ch boards each with 2 MOSFETS and 2 diodes.

-One kit spreads things out well for 2 ch (each with a P and an N output bd so 4 output MOSFETS per channel, 8 total) in the 5U x 400 chassis.

-One kit can use half the gain bd. and just one N board on one side and one P on the other in a 4U x 300 chassis as a monoblock. So one kit gives 2 smaller monoblocks each with 4 MOSFETS

-Two kits could make 2 monoblock 5U x 400 chassis' each with 2 P and 2 N output bds so 8 output MOSFETS per channel, total of 16 MOSFETS in two 5U x 400 chassis.

As far as diameter of pads on traces, well whatever Alex did...
and alex do good work. so i guess it's fine
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Old 8th December 2012, 06:58 AM   #625
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Originally Posted by dazed2 View Post
Cool Variac! Can't wait !

I know someone here probably asked already, but is it relatively easy to convert it to a balanced system by crossing a few grounds?
in theory it is
but that is all it is yet. and it will be a heck of a powerplant.
4 pair input J-fets. 16 pairs of outputs. and +/- 55-60V and you got a 300W class A amp
acctualy. you can rach the 500W class A mark at 8ohm

Last edited by AudioSan; 8th December 2012 at 07:04 AM.
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Old 8th December 2012, 11:02 PM   #626
dazed2 is offline dazed2  Canada
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Originally Posted by AudioSan View Post
in theory it is
but that is all it is yet. and it will be a heck of a powerplant.
4 pair input J-fets. 16 pairs of outputs. and +/- 55-60V and you got a 300W class A amp
acctualy. you can rach the 500W class A mark at 8ohm

yep and my very own block heater for those cold winter nights
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Old 9th December 2012, 09:43 AM   #627
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Originally Posted by dazed2 View Post
Cool Variac! Can't wait !

I know someone here probably asked already, but is it relatively easy to convert it to a balanced system by crossing a few grounds?
Balanced is best wayy to get votage up without raising rails, taking advantage of available current.
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Old 10th December 2012, 06:39 PM   #628
a.wayne is offline a.wayne  United States
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I bet it is not as quite as your 4 Pr standard version .....
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Old 10th December 2012, 06:58 PM   #629
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Balanced is best wayy to get votage up without raising rails, taking advantage of available current.
yes. if you can get it working right and have current from hell and above. same with outputs. and maybe input J-fets
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Old 10th December 2012, 07:14 PM   #630
dazed2 is offline dazed2  Canada
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ok ok, I was just daydreaming about a balanced version.... have no real aspirations for it anymore.

Standard 4pr version it is, I think its enough power already and plenty quiet if it mimics the regular F5.

AudioSan, what are your source resistor values? With the rails that you have, if you run 3A bias you should be able to get close to 150W.
If you use 0r47 then overall, V=IR your total bias voltage should be 1.41V right?
Then each FET should run at only 0.35V bias.

Last edited by dazed2; 10th December 2012 at 07:20 PM.
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