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Old 30th March 2007, 09:46 PM   #1
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Default Aria 6P14 makeover.

Hi, I am new to tube amps and have bought a cheap Chinese amp as somewhere to start. I have been listening to it for a couple of weeks and I'm very pleased with the sound.

What I don't like is the nasty pcb that everything is mounted onto and would like to junk the board and hard-wire it. I have managed to draw most of the cct after a start from a cct that MOAMPS drew some time back.

What I would like to know is, what the (20k I think) trimmer from pin 7 to ground of the input valves is for and how to measure its effect?
Any other (non obscene) comments for any of the other parts in the cct would be most appreciated..cheers..
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Old 30th March 2007, 10:02 PM   #2
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The pot is AC balance, for maximum of 2'nd order distortion cancellation.

Nice drawing!

What software did you use?

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Old 30th March 2007, 10:40 PM   #3
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Quote:
Originally posted by Wavebourn
The pot is AC balance, for maximum of 2'nd order distortion cancellation.

Nice drawing!

What software did you use?


OK, so you would need an oscilloscope to set that?

I used express PCB (free) but had to draw the valves. (could not use eagle at all)..

A picture of the inside, I expect the large capacitors I fitted are showing my non understanding (ignorance) of tube amps...
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Old 30th March 2007, 10:51 PM   #4
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Are you going to restyle it for training purposes, or it don't satisfy you sonically?
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Old 31st March 2007, 12:56 AM   #5
d2134 is offline d2134  Romania
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Hi, audio1st

I have a question: is it a poor quality PCB or you like more point-to-point wire?
I'm curiouse to see a picture of the original PCB, can you post one?
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Old 31st March 2007, 06:18 AM   #6
Svein_B is offline Svein_B  Norway
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This Aria Mini is almost identical to the Yarland FV-34C III described in a previous thread (incl. diagram) here

I agree that the small PCB make modifications more than a little difficult.

SveinB.
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Old 12th April 2007, 03:23 PM   #7
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Makeover finished, hardest part was removing the last bit of hum.
The 330ohm resistor where the feedback connects to, had to be earthed via the pot ground. My thanks to SY for his earth suggestion on another thread that allows me to connect the case to a safety earth without causing ground loop hum...PS sounds great..
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Old 12th April 2007, 03:24 PM   #8
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The finished diagram..
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Old 28th June 2012, 11:12 PM   #9
maton00 is offline maton00  Mexico
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do you used a output transformer like the one in the Yarland FV-34C III?(specs)
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