F5 Turbo Builders Thread - Page 63

AudioSan · 8th December 2012, 03:46 AM

Quote:

Originally Posted by Variac

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?

Variac · 04:14 AM

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...

dazed2 · 8th December 2012, 04:23 AM

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?

AudioSan · 8th December 2012, 05:52 AM

Quote:

Originally Posted by Variac

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

AudioSan · 06:04 AM

Quote:

Originally Posted by dazed2

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

dazed2 · 8th December 2012, 10:02 PM

Quote:

Originally Posted by AudioSan

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

buzzforb · 9th December 2012, 08:43 AM

Quote:

Originally Posted by dazed2

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.

a.wayne · 10th December 2012, 05:39 PM

I bet it is not as quite as your 4 Pr standard version .....

AudioSan · 10th December 2012, 05:58 PM

Quote:

Originally Posted by buzzforb

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

dazed2 · 06:20 PM

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.

8th December 2012, 04:04 AM	#622
Variac diyAudio Editor Join Date: Dec 2001 Location: San Francisco, USA	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... __________________ 2013 Burning Amp Festival announced: Sunday, October 6th in S.F. We need Volunteers & sign-up's for what you're bringing! Last edited by Variac; 8th December 2012 at 04:14 AM.

10th December 2012, 06:14 PM	#630
dazed2 diyAudio Member Join Date: Jun 2010 Location: Toronto	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 06:20 PM.

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8th December 2012, 04:23 AM	#623
dazed2 diyAudio Member Join Date: Jun 2010 Location: Toronto	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?

10th December 2012, 05:39 PM	#628
a.wayne diyAudio Member Join Date: May 2008 Location: Front Row Center	I bet it is not as quite as your 4 Pr standard version .....