Aria 6P14 makeover.

audio1st · 30th March 2007, 09:46 PM

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..

Wavebourn · 30th March 2007, 10:02 PM

The pot is AC balance, for maximum of 2'nd order distortion cancellation.

Nice drawing!

What software did you use?

audio1st · 30th March 2007, 10:40 PM

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...

Wavebourn · 30th March 2007, 10:51 PM

Are you going to restyle it for training purposes, or it don't satisfy you sonically?

d2134 · 31st March 2007, 12:56 AM

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?

Svein_B · 31st March 2007, 06:18 AM

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.

audio1st · 12th April 2007, 03:23 PM

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..

audio1st · 12th April 2007, 03:24 PM

The finished diagram..

30th March 2007, 10:02 PM	#2
Wavebourn diyAudio Member Join Date: Sep 2006 Location: Pleasant Hill, CA	The pot is AC balance, for maximum of 2'nd order distortion cancellation. Nice drawing! What software did you use? __________________ The devil is not so terrible as his mathematical model! Wavebourn: We Create Creativity!

30th March 2007, 10:51 PM	#4
Wavebourn diyAudio Member Join Date: Sep 2006 Location: Pleasant Hill, CA	Are you going to restyle it for training purposes, or it don't satisfy you sonically? __________________ The devil is not so terrible as his mathematical model! Wavebourn: We Create Creativity!

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31st March 2007, 12:56 AM	#5
d2134 diyAudio Member Join Date: Mar 2007	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?

31st March 2007, 06:18 AM	#6
Svein_B diyAudio Member Join Date: Oct 2005	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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