F5m kit

[Mikerodrig27]

Excited to hear your impressions regarding the Stasis amp when you get it wrapped up.

 

[Holzarbeiter]

I can still lift heavy things with relative ease

Bone cancer has dropped me off a cliff.

If that was you, Pass' point model? At BurningAmp You are Superman!

SissySit and Stasis.

Zen products?

 

[6L6]

Stasis is old-school Nelson, from the Threshold era.

Yes, SissySit is a Mighty ZenMod amp.

 

[Holzarbeiter]

Stasis is old-school Nelson, from the Threshold era.

Yes, SissySit is a Mighty ZenMod amp.

I will go to Zen's and look around to see if there are any specs. I assume Stasis boards won't be available.

Thanks...

 

[6L6]

Everything is available. The more advanced the project, the more you have to dig.

But nothing is hidden.

 

[Holzarbeiter]

the more you have to dig.

Finding it true. If boards are not available it will stop me. As there are too many amps in que. With same amount of speakers to build.

 

[william2001]

but current capability of "just" one pair per side, somewhat meeh

don't use force, use a bigger hammer

What is the maximum dissipation we would dare to push a single (TO-247) device? (assuming "perfect" mounting and ample heatsink)

 

[Zen Mod]

50

 

[tonyEE]

I agree.

I can still lift heavy things with relative ease, the next fun amps will be SissySit and Stasis.

I've spec'd the aluminum deluxe chassis.... the 4U SissySIT feels pretty light. Even the 5U, with handles front and back LOOK heavy but are actually rather light.

Surprisingly, the steel Rawson chassis are heavier, yet more compact.

 

[Allan]

Thanks Nelson for yet another great project, chomping at the bit over this one!

 

[andynor]

What is the maximum dissipation we would dare to push a single (TO-247) device? (assuming "perfect" mounting and ample heatsink)

I ran my Aleph J Zen in a 5U for two years @ 46 watts per device. Keratherm and torqued @ 0.9nm as per the mighty ones recipe. No issues, ran like a dream but of course hot. My BA-3 is biased a bit higher, dissipating around 125 watts per channel / 0A9/21watts per device in a 5U. I like it hot. The BA-3 really excels with more Iq, imo/ime. The front end especially has a lot of extra potential given more Iq, imo/e (off topic but wth).

 

[andynor]

I can still lift heavy things with relative ease

No surprise there. 6L6 «lifts» aeroplanes on a daily basis

 

[Zen Mod]

@ 0.9nm as per the mighty ones recipe.

Mighty Pa's

I recommend a nice wide washer on top.

The TO247 case has good support at the hole, and you
just want to avoid cranking down too hard. We use
torque wrenches set at 8 inch-pounds.

 

[andynor]

You have your Pa, I have mine

 

[Zen Mod]

 

[ItsAllInMyHead]

The 150s should be at 1.1 Nm, but I like 1.2 to really make them sing. Forget Iq... it's the mounting torque.

Those puny ones can be at 0.9; they can't handle the pressure.

Salt to taste for your favorite recipe.

 

[Zen Mod]

as long it's controlled, no big difference and both 0.9 and 1.1Nm are good

though, with Keratherm (squishy, case leaning) 0.9 is my choice, with mica you can go 1.1

 

[Toys4Boys]

Coupe of questions;
1. Is Keratherm worthwhile for the F5M
2. For those without a torque driver any suggestions as to how to best gauge torque?

 

[ItsAllInMyHead]

as long it's controlled, no big difference and both 0.9 and 1.1Nm are good

though, with Keratherm (squishy, case leaning) 0.9 is my choice, with mica you can go 1.1

For clarity... I was just poking fun. Hope that was clear with the and Agreed re: above.

Me... I am finely calibrated to a skosh over finger tight. Works well.

 

[6L6]

Me... I am finely calibrated to a skosh over finger tight. Works well.

As long as you remember to use a split washer between the screw and the fender washer, that’s going to be a decent torque amount. There is a lot of thermal expansion/contraction in the mosfets as they heat and cool, and the split washer is very important to keeping everything attached properly.