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Old 22nd November 2014, 12:14 AM   #1
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Default F5

i had a little current adjustment on my F5. well. a little is from 0.8A to 1A pr Device. and a dual device amp. damn. it will sound more relax
now it is a 2 pair, 1A pr pair 24Vdc amp. alot like the F5turbo v1. offsett stays about 0.01 to 0.1V. temp is easy 45-50C on the sinks. no more. oh. the sinks are 10.080" 6" USA heatsinks. 2 pr side. now its about 2A pr side. the f5 is good with this

now its been a week.
from 1.7A to 2.6A. the amp is a lot more lelaxed. a smoother sound. but the temp did not rise to much
those heatsink USA profiles are very good.
as it it is: 53c and 24c room temp. so. 29c above.

Last edited by AudioSan; 30th November 2014 at 02:25 AM.
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Old 30th November 2014, 02:51 AM   #2
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well. i did get to test those USA heatsinks. i have 2 10.080" 6" pr ch. and i i am now running 2.7A at +/-23VDC. thats 124W pr side. and the sinks are below 30c above ambiant at everyting but optimum
so a 250W monoblock is realy NO problem. what so ever.
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Old 30th November 2014, 05:07 AM   #3
Halair is offline Halair  Norway
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Details please Inquirying mind want to know...
(I am about to start my own F5 once parts start to trickle in...)
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Old 30th November 2014, 05:33 AM   #4
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Old 1st December 2014, 11:13 AM   #5
Halair is offline Halair  Norway
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Intet mottatt
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Old 1st December 2014, 07:04 PM   #6
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Location: austria, kottingbrunn
Maybe you will post FFTs showing the distortion spectrum at different bias levels?

Best Regards,
James
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Old 2nd December 2014, 11:18 AM   #7
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Quote:
Originally Posted by james watt View Post
Maybe you will post FFTs showing the distortion spectrum at different bias levels?

Best Regards,
James
if i only could.
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Old 2nd December 2014, 04:44 PM   #8
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Join Date: May 2005
Location: austria, kottingbrunn
But its very simple on non bridged amps. You need only:
Fullduplex soundcard on your PC
Download ARTA from artalabs.hr
(You can use this software without registration for free)
Dummy load resistor

The ARTA manual shows how to connect.

Best Regards,
James
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Old 3rd December 2014, 08:10 AM   #9
AndrewT is offline AndrewT  Scotland
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describe your method so that those with the same hardware can implement.
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regards Andrew T.
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Old 3rd December 2014, 07:14 PM   #10
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Default Distortion measurement using ARTA

AudioSan and AndrewT, I know you are one of the most skilled members here. I followed several threads since years and learned a lot from your posts (and sometimes funny discussions).
Having this in mind, I will try to explain:

Hardware:
Compaq 610 Laptop
TERRATEC DMX6FireUSB Soundcard

Software:
Windows 7
ARTA from ARTA Software

Wiring:
wiring.JPG

For R2 I use a 10k poti. This helps to adjust the input level for the soundcard in order to stay around 0dBFS. The attentuation in dB is not important to know.
For RL (Dummy Load) I use 4.1R/100W Resistor on a heat sink.
And I didnīt use the diodes, but you have to be carefull when testing at high output levels!
A DMM is used to measure the Voltage across the RL. This is needed to know at what level of amp output power the measurement is done.

The best way to learn how to use ARTA for this measurement please refer to the ARTA user manual, section 2, Spectrum analyzer.

This is an example of my F5Turbo_V3 at 2.4A Bias, at 5,66Vrms in 4,1ohm which gives 7,8Wrms:
Bild5.jpg

Please donīt hesitate to ask more detailed questions.
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Best Regards, James Watt.
Liquid cooled Aleph-X; F5Turbo_V3 Monoblocks
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