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Old 10th November 2013, 10:26 AM   #41
Piersma is offline Piersma  Netherlands
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Default Ulti Amp problems

hi Jack,

Missed your last posting during the august holidays, sorry.
Did you resolve the problems by now?

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Old 11th November 2013, 06:58 AM   #42
JackV is offline JackV  Netherlands
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Default Measurement Ultiamp

Hi Piersma,

No problem, I hope you had a good holiday. I haven't had much time in the meantime also.
Regarding the Ultiamp project:
I've purchased some poti's to replace R13, R14, R15 and R27. In this way I hope to get the DC-settings in the correct range.
I've noticed that sometimes one channel doesn't produce any audio although the security PCB indicates everything is switched on and OK.

Do you have any suggestions? Do you have some detailed pictures of your modifications?


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Old 11th November 2013, 08:09 AM   #43
Piersma is offline Piersma  Netherlands
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Default Problems

hi Jack,

Check the idle current stability over at least one hour and see what happens, it might be the cause of the problem you mention. I would strongly suggest, as mentioned earlier in this threat, to use 0,1% resistors in the front end stage to resolve the DC offset.


Jack V please sent me a private message
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Old 10th December 2015, 05:59 PM   #44
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Any progress on Ultiamp im just curious about this.
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Old 10th January 2016, 05:03 PM   #45
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check out this thread:
Using Many Small Signal Transistors Paralleled in place of one output Transistor
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