F5 Turbo Builders Thread

[noSmoking]

Hi Buzz,
Been catching up/reading all the threads,lol. and those things were mentioned,But AudioSan says clear skies,so I'll know soon, going to break for alittle while,let yall know soon,

 

[AudioSan]

no. Q5/6 is coscode transistors an the beta boards that i have it is wrong marking. but thats no problem
yes i know. but it's better to hand tap it when it's not a hole all the way thrue

 

[buzzforb]

Hi Buzz,
Been catching up/reading all the threads,lol. and those things were mentioned,But AudioSan says clear skies,so I'll know soon, going to break for alittle while,let yall know soon,

Just speaking of safest way. I took the fire it up route. Smoke is part of the fun.

 

[Renron]

Thank you AudioSan. I just ran across a post #365 from Buzz describing the XA160.5 and more Fets with lower bias. No matter how many times I read a thread, I always find something new.

 

[AudioSan]

i did fire up my front-end today. just to make sure the cascode section is working. and it does.
with 25V rails i got 7.4V on J-fets drain relative to Gnd. R25/26 is 10K R27/28 is 4.75K

 

[buzzforb]

Brock numbers give you good preset range. First official V3. I hope you like it

 

[a.wayne]

Hey,

You guys are distracting buzz, who was on a mission to let us know how a 4 pr 5T would work ....

 

[buzzforb]

And I am so thankful.

 

[nrg2009]

I have my fingers crossed that someone will come through with an F5Tv2 in a 5U chassis from the store as a dual channel amp. I know that at least someone has thought about that setup.. it must be..

 

[buzzforb]

The 5u chassis will handle the heat from a V2. Might eve. Get away with v3 at half bias and no diodes. They will sound different.

 

[AudioSan]

Hey,

You guys are distracting buzz, who was on a mission to let us know how a 4 pr 5T would work ....

well. i'm about 8 drill's and tap's away and some transistor soldering.

 

[a.wayne]

Ahhh San steps up... dats big power Audiosan, sure you can handle it ...

 

[AudioSan]

some F5 turbo heatsinks 33Kg. and rectifier bridges mounted on sinks.

 

[Zen Mod]

33kg

 

[AudioSan]

yepp 11Kg pr chassis. 2 turbo V3 monoblocks. and 1 turbo V2 stereo amp.

 

[dazed2]

NICE!
Where are those heatsinks from? and how big are they?

 

[AudioSan]

it is 10.080" profiles from heatsinksUSA. 6" long.

 

[GentryBa]

hi there!

any possibility for a stereo f5t with 530VA / 30V r-core transformer?
maybe for V2 its enough power?
30VAC should gave me over 40VDC- would that be ok?

Thanks!
Best regards,
Matthias

 

[Zen Mod]

30Vac - once , or twice ?

 

[AudioSan]

hi there!

any possibility for a stereo f5t with 530VA / 30V r-core transformer?
maybe for V2 its enough power?
30VAC should gave me over 40VDC- would that be ok?

Thanks!
Best regards,
Matthias

2x30V transformer?
lets crunch some numbers. +/40V and 1.6A bias will give you a dissipation of 125W pr ch. and that is maximum for your transformer.
that will give you: (1.6A*2)*(1.6A*2)*8/2= 40W class A at 8ohm.
with +/-40V rails it will give you about 85W class A/B at 8ohm.
you will also need to cascode the input fets.