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Old 18th February 2012, 03:22 PM   #11
ianc13 is offline ianc13  United Kingdom
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Hi,

I actually didn't mount the large transistors directly on the board itself. I run some wire from the board to the FETs. My heat sinks were all ready tapped for my F5 so this was the path of least resistance.

It is possible to run short wires without too much issue with oscillation. In this build I am actually using slightly longer runs of wire (due to the existing tapped holes) but am having no oscillation problems.

Ian
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Old 20th February 2012, 12:37 AM   #12
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Hi Ian,

Thanks for the info. I will most likely do the same. Saves a lot of problem figuring out the assembly.

Oon

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Old 29th February 2012, 10:10 AM   #13
ianc13 is offline ianc13  United Kingdom
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So, I finally finished wiring up the F2J with the LEDs and added a electrostatic shield to the transformer. I wish I had the foresight to get the transformer company to fit the shield, that would have been much, much easier!

Some photos of the inside.
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Old 1st March 2012, 07:08 PM   #14
Tea-Bag is offline Tea-Bag  United States
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My F2J soundstage bests the F5 (IMO). I build it using as cheap as parts as I had around and it sounds amazing. I am stuffing another PD board and getting some better parts to see if actually sounds any better.

The new parts are low PPM Mills resistors, PRP signal resistors, 10Uf Auricaps for input ,Mudorf New 10,000uf E-caps for the output.

I use 25R Mills-MRA-12 on the output running into a 15R Lowther PM5T with copper VC.

Last edited by Tea-Bag; 1st March 2012 at 07:38 PM.
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Old 1st March 2012, 08:31 PM   #15
ianc13 is offline ianc13  United Kingdom
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I was lucky enough to have some more 'exotic' parts in my parts bin from some previous valve projects, so I had a load of Elna Silmic IIs, Russian surplus teflon caps and some bigger Russian surplus polystyrene caps. Needless to say they all got used.

I can't compare my F2J to any other version, but it beats my F5 (that it replaced) on my single driver speakers hands down. The F5 was no slouch either.

The mids and highs compare with my PX25 single ended mono blocks and the bass on the F2J just blows them away.
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Old 5th March 2012, 04:22 PM   #16
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I am thinking of using this cap at the output of the F2J. A 490uF PP cap maybe bypassed by something of higher quality such as a mundorf M-cap. I believed it is probably not one of the best cap but I believe better than an electrolytic. I don't really need the bass, since I am using it for my fullrange (I have a separate amp for the woofers).

Any thoughts on this?

Oon

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Old 5th March 2012, 04:49 PM   #17
Tea-Bag is offline Tea-Bag  United States
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Oon, I only use my F2 for 200hz up, after electric x-over.
I use only 200uf of Elna Silimics now.
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Old 5th March 2012, 10:21 PM   #18
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@Tea-Bag

Just got my R100's in the mail. Thanks for the great service!
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Old 6th March 2012, 12:28 AM   #19
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Oh yeah. Forgot to mention that. Received your transistors last week. Looks great. Now just need to round up the rest of the components.

Oon

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Old 6th March 2012, 07:42 AM   #20
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Quote:
Originally Posted by oon_the_kid View Post
I am thinking of using this cap at the output of the F2J. A 490uF PP cap maybe bypassed by something of higher quality such as a mundorf M-cap. I believed it is probably not one of the best cap but I believe better than an electrolytic. I don't really need the bass, since I am using it for my fullrange (I have a separate amp for the woofers).

Any thoughts on this?

Oon

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Just realised my earlier post is missing the link. The polyproplene Cap I want o use is this one.

CORNELL DUBILIER|947C491K801CBMS|CAPACITOR, 490UF, 800V, DC LINK | element14 Singapore

Weighs a kilo, i've never heard of a cap this heavy and huge, doesn't seem to cost to much for its value so why not give it a shot.

Oon
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