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Aphex Dominator II 720 Trouble
Old 4 weeks ago
  #1
Here for the gear
 

Aphex Dominator II 720 Trouble

Howdy,
About two years ago I bought a used Aphex Dominator II 720 off ebay for <$200.
Never functioned properly.
Recently I reached out to Audio Rehab in Burbank, CA about it.
They said send it in, with $65 deposit for inspection.
What I ended up doing is buying a DIFFERENT Aphex 720 off craigslist for $100.
#2 DOES NOT FUNCTION PROPERLY...

However this time it seems manageable...

One channel is louder than the other. About 6db on the vu meters.
I read the manual and opened the case to fine adjust the pcb gains.
These adjustments yielded an equal level when the unit is engaged.
However the unit still is 6db uneven when in bypass.
I suspect this is the reason for some distortion appearing.
I suspect one channel is being limited 6db hotter.

What the heck can this be? Should I trace and compare the two channels from the beginning inputs? Perhaps a xlr input plug is bad?

Wish I could have one that works at some point, even if it takes combining two... ugh
Old 4 weeks ago
  #2
Lives for gear
Sounds like an issue with the balancing.
Old 4 weeks ago
  #3
Lives for gear
Like phase cancellation on your balanced in or out.
Like the + and the - of the balanced signal should be moving opposite Each other. If one is reversed, then they live the same and are in phase, and the volume gets reduced. By 3 or 6db iirc.

Hope this helps!
Old 4 weeks ago
  #4
If -6 db in bypass you have a faulty relay.
Old 4 weeks ago
  #5
Here for the gear
 

The very first thing I noticed was the one channel +6db louder.

I think tweaking the one channel louder was not the true fix.

In order to get levelseven while engaged, it took a gain boost on ch 1, plus a gain reduction on ch 2.

I'm here now again with the box open, and I am going to keep snooping around for strange voltages.

Gonna start from the signal cable forward....

Thanks to everyone for the input lord knows i need it
Old 4 weeks ago
  #6
Lives for gear
Quote:
Originally Posted by Jim Williams View Post
If -6 db in bypass you have a faulty relay.
Listen to this guy, swap the relay, he knows what he’s saying!
Old 4 weeks ago
  #7
Here for the gear
 

So ive dismantled both units and realized that they indeed have subtle differences.

Original unit A has small damage, hole on the main board where c405L, and c406L once existed.

So I am utilizing the Main board from unit B which has no visible damage.

Also, the smaller modules (?) have different chips (?) lol
between unit A and unit B.
TL074CN vs LF347N

I suppose the newer looking TL074cn are better. They appear non oem.

That's where I am at.... not a clue lol
Old 4 weeks ago
  #8
Lives for gear
Post some pictures of the insides!
Old 4 weeks ago
  #9
Here for the gear
 

I tried but apparently I am not allowed to insert IMG links in my posts.
Prolly because I never post... bummer
Old 4 weeks ago
  #10
Here for the gear
 

Quote:
Originally Posted by enginefire View Post
Post some pictures of the insides!
gimme an email and i can send em if you like...
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