Aria - AUM-1 Ultra Metal

Bernardduur · Post by **Bernardduur** » 08 Jul 2008, 19:56

Had one today under my hands...... nice little box that could deliver nice sounds

Discofreq entry

Schematic

Quite similar to the Boss HM-2

soulsonic · Post by **soulsonic** » 09 Jul 2008, 07:41

I love this circuit!

analogguru · Post by **analogguru** » 10 Jul 2008, 07:53

Sadly the schematic contains at least two mistakes:
1.) A missing 470k from the base of the input buffer to Vref.
2.) The 100k resistor at the last transistor of the EQ-section should connect to the base (instead of the collector) and the collector should connect to V+

And missing is the information if the trannies are -O, -Y, -GR or -BL types.

The diode at the base of the power-supply transistor is a zener diode with 9,1 V.

Anyway, thanks for the trace,
analogguru

Bernardduur · Post by **Bernardduur** » 10 Jul 2008, 12:25

analogguru wrote:Sadly the schematic contains at least two mistakes:
1.) A missing 470k from the base of the input buffer to Vref.
2.) The 100k resistor at the last transistor of the EQ-section should connect to the base (instead of the collector) and the collector should connect to V+

And missing is the information if the trannies are -O, -Y, -GR or -BL types.

The diode at the base of the power-supply transistor is a zener diode with 9,1 V.

Anyway, thanks for the trace,
analogguru

Thanks man!

I'll check em!

Edit:
You were right

I replaced the schematic with a new one. Transistors are of the GR type. Zener is 9.1V. Can't say much on the diodes other that they measure 0.646V (silicon diodes I guess; no markings on em) and 0.305V (germanium diodes I guess; again no markings).

seniorLoco · Post by **seniorLoco** » 11 Jul 2008, 01:53

Nice job B ....thanks!

mailoszyarr · Post by **mailoszyarr** » 10 Sep 2014, 18:51

Hi!
Link to schematic doesn't work. Can you give a new link?
Thanks,
Milosz

Bernardduur · Post by **Bernardduur** » 16 Sep 2014, 12:03

I'll send a copy to your mailadress and will post it again here!

287m · Post by **287m** » 25 Jan 2015, 16:51

hi Mr B

where the scheme? please, count me in

i want build this

Thanks very billion much. hehe

Franzki · Post by **Franzki** » 21 May 2015, 22:00

Would love to have the schematic as wel... bought an Aria ProII Ultra Metal pedal but want to figure out how the overdrive section works... I counted at least 6 diodes in the signal path...

Post by **modman** » 21 May 2015, 22:29

Sent a pm;

Could you please reup the schematic, attach or if you like to have a partition of the fsb server for ftp upload, lemme know. I think I already proposed this before..."

Bernardduur · Post by **Bernardduur** » 25 May 2015, 11:23

EddieTavares · Post by **EddieTavares** » 25 May 2015, 12:53

This is a Boss HM-2 with minor diference, OK?

I have one but I duno where it is. Its noisy and harshy, I tried to mod but after that it sounds more like a DS-1 nothing about the "metal".

Franzki · Post by **Franzki** » 29 May 2015, 00:50

I recently bought the Aria... It may not be a real `metal` distortion but I like the way the sound cleans up when I keep the volume low on my guitar. Unfortunately the distortion taper is not working well anymore in the lower regions... but running this pedal in a low gain mode would probably make it great for blues and rock overdrive.

soulsonic · Post by **soulsonic** » 29 May 2015, 01:17

Franzki wrote:I recently bought the Aria... It may not be a real `metal` distortion but I like the way the sound cleans up when I keep the volume low on my guitar. Unfortunately the distortion taper is not working well anymore in the lower regions... but running this pedal in a low gain mode would probably make it great for blues and rock overdrive.

I can't speak for the Aria, but the HM-2 has a really bad taper toward the bottom of the Gain control. From about 8 o'clock to 9:30-10:00, it jumps from almost low gain to almost maximum distortion and doesn't get very much more distorted the higher you turn it past that.
It does clean up very well, too, and I think the fuzzy edge of it gives it a unique tone for more of a fuzz than distortion sort of sound.

Manfred · Post by **Manfred** » 25 Jul 2016, 00:17

I have got a Ken Multi MUM-7 for repair, it is identical in construction with the Aria AUM-1.
I found out the types of clipping diodes as follows.
The Silizium diodes are all 1N914 and both Germanium diodes are 1N34A.

Aria - AUM-1 Ultra Metal [schematic]