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Old 28th July 2009, 08:27 PM   #1
diyAudio Member
Join Date: Jul 2009
Question How Set up Aria Mini 6P14?

i have this tube amp from two year.
i made a little upgrades: tube changed, paper oil capacitors, etc...
Now i have a problem, how can i set up step by step the 4 trimmer on pcb side?
i have oscilloscope, the classic 1khz software generator and multimeter.
Please help me

ps: i'm sorry for my poor english... i was the teacher nightmare...
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Old 28th July 2009, 10:08 PM   #2
diyAudio Member
Join Date: Jul 2009
Default i forgot schematic

i forgot schematic...
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Old 29th July 2009, 12:12 AM   #3
Gordy is offline Gordy  United Kingdom
diyAudio Member
Join Date: Nov 2006
I will try to help. I am not experienced with Push-pull, but let's have a go...

1. The trimmer pot located between pin 7 (of the 6N3) and ground: this seems to adjust the positive / negative symmetry of the output.

So, locate the trimmer of one channel, place a load on the output of the amp, feed in a test signal (example 1000 Hz sine wave at 0.250 Volts) at the input (of that channel), monitor the output of the amp using the oscilloscope, adjust this trimmer for + / - symmetry of the output either side of zero.

Repeat on the other channel.

2. The trimmer pot at the input: this sets the overall level of the channel.

So, locate the trimmer, place a load on the output of the amp, feed in a test signal to the input of the Left channel. Record the output signal level. Feed in a test signal to the input of the Right channel. Adjust the trimmer so that the Right channel has the same level as the recorded level of the Left channel.

I hope someone with more experience of Push-pull amps can confirm this. : )
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