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Old 13th September 2008, 05:45 PM   #1781
stein2 is offline stein2  Serbia
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I have just turned off the second channel. I don't think I should go into much detail but both channels started up without blowing the 3A fuse on the 500VA toroid transformer. I tested both channels separately. The results are pretty much similar. Loaded rails voltage stands still at 21.5VDC, DC on output 0.000VDC at 2V position on the multimeter while both source resistors have around 6.2VDC across them. That is for both channels. Input J-fets (170/74) are matched, nothing else is. I will still need to put both PSU sections and amps with heatsinks together and build some kind of box around them, but I deliberately placed the heatsinks on their back to get the worst possible heat releasing capacity and measured (again, the same on all four output devices) 65 degrees C on the plastic housing of the transistor, 50-51C 10mm from the transistor (on the heatsink) and about 40-45C on the edges of the heatsink. The 25W 0.22resistors in the filter and the 2.2K resistors remain cold (not ice cold, though). both amps were on the table for about three and a half hour and the temperatures and voltages remained pretty much constant/stable after the first 30 minutes. The maximum DC variation on the output went to 0.005V for short time (couple of seconds) and slided back. At the same time, the voltage across the source resistors did change at benign levels, from .599 up to max .620 in extremes. I am very pleased to say it all went very smooth from the very first moment. I hope it will serve my ESLs with the same stability to my complete pleasure. So, if anyone is reading this, I must also say that this was my very first attempt to build an amplifier that requires adjustment and also my very first attempt to build a solid state amplifier that works in Class A. Mister Nelson Pass, thank you for designing this amplifier and sharing it with DIYers, thanks to Zen Mod for intensive support and not turning the phone off, Mr. Borko who provided the design for PCBs and my lucky star for not letting me start a fire in our living room...
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Old 13th September 2008, 05:48 PM   #1782
stein2 is offline stein2  Serbia
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and the voltages... Left is DC on output, right V across source resistor.
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Old 13th September 2008, 05:54 PM   #1783
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by stein2
I have just..................................

Quote:
Originally posted by stein2
and the voltages....................

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Old 13th September 2008, 06:02 PM   #1784
stein2 is offline stein2  Serbia
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Old 13th September 2008, 06:08 PM   #1785
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Default hi!



Regards zeoN_Rider
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Old 13th September 2008, 09:14 PM   #1786
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Keep going stein.
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Old 14th September 2008, 09:45 AM   #1787
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by spavleski
Keep going stein.



I just hope that his Hungarian is as good as his English
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Old 14th September 2008, 09:48 AM   #1788
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I just hope that instrument on the left is connected as it should be............... . ...............Ok, that was a JOKE. I'll stop it here. Hope the sound of F5 will pay off the effort of completing F5 in 10 days including hard work and stress.
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Old 14th September 2008, 10:14 AM   #1789
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by spavleski
I just hope that instrument on the left is connected as it should be............... . ...............Ok, that was a JOKE. I'll stop it here. Hope the sound of F5 will pay off the effort of completing F5 in 10 days including hard work and stress.

yup , that's even more decent work - including his illness (minor problems with lungs) ;

fortunately , that's just temporary ....... not like permanent short circuit between headphones , which is certainly bigger issue for our friend Stein



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Old 14th September 2008, 11:26 AM   #1790
stein2 is offline stein2  Serbia
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Quote:
Originally posted by Zen Mod





I just hope that his Hungarian is as good as his English

I can, at least read und fersten alles von diese seite:

www.ret.hu

Can you?

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