AudioSan,
You know that your about to have a lot of builders coming on line. Sure hope you got some extra time
"wallet heat mass and weight for starter"
Seems unreasonable . Unobtainium!
100W Class A? sounds good to me!
3.6A ? It's gonna get hot. May have to add a small fan. Or change the subwoofer to a TRW-17
well. 3.6A will run cooler then 5.52A
build in some fans in the rack that blows air up thrue the sinks
AudioSan said he was goign to finish first. I am waiting on him. Truthfully, THe F5T is a COMPLETELY different sound than the F5, which I did not prefer. If the V3 version improves things as much as the V2, I might quit.
Ignore that. IT was said in moment of insanity. I am in fact not doing a V3, but instead a balanced V3, with a twist
Or chimney.well. 3.6A will run cooler then 5.52A
build in some fans in the rack that blows air up thrue the sinks
well. i can think of a copple of things. wallet heat mass and weight for starter
and to acctualy get 480W output you need some high voltage. about +/-90V.
2*90V*5.52A=994W dissipation pr ch at idle. and this is minimum
if you want to get say 100W class A at 4ohm, you need about 3.6A bias. and around +/-32V rails(fully loaded)
San,
Can you explain how you are calculating the power from 32v rails ...?
+/-32V rails give you about 29V P-P on the output.
29*29/4ohm=210W peak or 105W Rms.
for class A power:
3.6A*2=7.2A peak.
7.2*7.2*4ohm=207W peak or 103W Rms.
lots of outputs. yes. but no one have that amount of bias VS rail voltage
5.52A bias makes it good for over 480W class A power at 8ohm. but it is voltage limited at around 50W at 8ohm with +/-32V rails.
Audiosan, would you like to re-write that and try to get it right this time?
it is already right.
you do not have to calculate Rms factor first. if that's what your thinking of.
29*29/4/2=105W
29*0.707=20.5V
20.5*20.5/4=105W
same goes for bias.
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so what you say is, that one dont get this output from that rail voltage?
then it seams that you have to inform Nelson that his power calculations has been wrong all this years, as my numbers match his numbers.
from the F5turbo article:
The F5 TURBO V1
Increasing the power supply voltage is the obvious way to get more power out
of an F5. You can simply raise the supply rails to +/-32 Volts and get 50
watts into 8 ohms right away without other modification. 24 V AC secondaries
on the power transformer will do it. Don't forget to use higher voltage power
supply capacitors. Probably you should also upgrade R9 through R12 to 5
watt resistors. Depending on your heat sinking, you will probably want to
adjust the bias so that the power transistors don't run too hot.
Here you see the F5 without the limiters and with an additional set of output
devices. With adequate heat sinking, you can bias them to 1 amp each, for a
total of 2 amps, which will operate the circuit Class A well above 100 watts
peak into 8 ohms. You probably take the bias to 3 amps with enough sink.
Hi Guys,
I decided to look throught my transistors and see if the theory that a small copper part is not tinned near the body of a gen-u-wine part, well I have got parts from all over the globe,
Check the pic and see if you see what I saw,I will put them on the curve tester and see how they look.
Regards,
NS
I decided to look throught my transistors and see if the theory that a small copper part is not tinned near the body of a gen-u-wine part, well I have got parts from all over the globe,
Check the pic and see if you see what I saw,I will put them on the curve tester and see how they look.
Regards,
NS
On eBay, there are multiple sellers offering 2sk117gr with Idss of 14mA
well. thats a no brainer