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Old 2nd December 2009, 12:53 PM   #631
Salas is offline Salas  Greece
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Quote:
Originally Posted by woodturner-fran View Post
So that would seem like a reasonable amount of heat!!!!

Anyway, next step is adding in the lightspeed.
I hope that you will take time to evaluate any impact of the much higher CCS current before you change attenuator technology and things will not be equal to judge anymore. Its an interesting point to know if sparing any more energy is inviting at all on performance grounds.
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Old 2nd December 2009, 12:58 PM   #632
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Originally Posted by Salas View Post
I hope that you will take time to evaluate any impact of the much higher CCS current before you change attenuator technology and things will not be equal to judge anymore. Its an interesting point to know if sparing any more energy is inviting at all on performance grounds.
this is the problem with absolute troubleshooting/swapping and understanding change.

I often don't want to crack it open take it half apart only to make one change. That's often unrealistic. At least for me.
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Old 2nd December 2009, 01:01 PM   #633
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Well to tell the truth, so far I have been concentrating on "smoothing" this build out. So other details have been lost a bit.

What I will do now is listen for a while and then revert back to the 68//68 config as per the BOM. It will be very interesting to hear a difference if any.


BTW, the other thing that changed in my setup is that I went from 2 x separate 12V 25va transformers to one 120VA 15 transformer. If you remember the voltage on the 12v was only coming out at 11V unloaded.


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Old 2nd December 2009, 01:02 PM   #634
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Exactly why the building thread is very useful. A few thoughts and paths explored by some pioneers in some reasonable step by step manner and then we will all have a shortcuts map.
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Old 2nd December 2009, 01:55 PM   #635
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I posted a while back that at first I was very put off by the sound of the DCB1. Didnt like it and was hesitant to post anything like that on the thread as others were enjoying it. However after listening for a week or so all of a sudden I HEARD it change, right there before my ears everything smoothed out and this high frequency harshness that had been on top of all extended mid to higher frequency tones disappeared. It was a very quick change and very obvious and also very unexpected. I have no idea if it was resistors or caps or jfets burning in but something changed as a result of being used for a certain period of time.
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Old 2nd December 2009, 02:49 PM   #636
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OK, thats interesting too.

I think I should just live with this for a while and wait and see. I don't want to go making changes now that are complicated by other factors ..... might lead to wrong conclusions



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Old 2nd December 2009, 08:50 PM   #637
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I think that anyone that believes components need burn in is completely deluded.

All properly designed circuits should perform to specification within a few seconds and reach their best compromise of performance targets when the optimum design temperatures have been achieved, probably within 30minutes from a cold start up.

Changes that occur days and/or weeks after initial start up and testing must be due to changes in the components. The major culprit for this change is likely to be old stock electrolytic capacitors. The oxide film degrades rapidly after production. The manufacturers specify in detail the reforming that must be done to allow their caps to be specification checked in the factory. After they have been transported around the world and sat on the wholesalers shelves and then at the retailers shelves and finally on the DIYer's shelf, how can an electrolytic perform to specification if it is not reformed to the manufacturer's specification?

I have been promoting this culture for years, but the deluded stick to their beliefs.
You could call it deluded, I call it burn in. Reforming could also be called burn in.

Fact is that a lot of gear does not sound optimal when powered on first. You can test that yourself too by building 2 identical circuits. Then power one on and leave it on for a week. After that week just switch on the second one and compare them A-B ( blind ) after one minute...
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Old 2nd December 2009, 09:00 PM   #638
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I think the thread going on a tangent. One that really ain't too helpful.
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Old 2nd December 2009, 09:36 PM   #639
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I agree, maybe the mods can be asked to close this thread ? The "building" thread is more appropriate.
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Old 2nd December 2009, 09:53 PM   #640
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But this is the building thread. Tech or experiment should be here. The GB thread don't need to have any presentations of build or anything tech anymore. We can simply move any new, build targeted post from there here if it occurs by mistake.
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