[LAU] Delta 66 woes

Dave Phillips dlphillips at woh.rr.com
Thu Dec 19 21:25:22 CET 2019

Hi Len,

On 12/19/2019 01:04 PM, Len Ovens wrote:
> On Thu, 19 Dec 2019, Dave Phillips wrote:
>> My audio device has been an M-Audio Delta 66 + Omni I/O breakout box 
>> that has served me well for many years. Alas, something is now 
>> causing a severe problem with it. When I turn the unit on in the 
>> morning the clip and input lights are solid red and green and remain 
>> so for up to five or more minutes before they go off. Adding to that, 
>> my portable room heater is now causing a terrible hum through my 
>> speakers. I tried another heater, got the same results.
>> So, is the problem likely the Delta card ? I have a replacement for 
>> it that I could swap out, but I thought I'd check with the experts 
>> first. Or should I get an electrician to check out the wiring in my 
>> room ?
> "clip and input lights are solid red and green" These lights are on 
> the omni I am guessing and so likely the problem is with that box 
> rather than the D66 card itself. Using mudita24 (not envy24control) on 
> the Analog Volume tab do you see high level in? (the level for the 
> input is in text just under the port name (ADC1-3) and can be reset 
> with the "Rest Peaks" button in the lower left corner) If there is no 
> level or -inf it shows "(off)". If you are seeing the same high level 
> right after turn on, try disconnecting the omni i/o and see if the 
> levels are now (after reset) "off". This test should show that the 
> problem is in the i/o box.
> The most likely thig to be wrong is a capacitor. With the i/o box open 
> find a larger cap probably close to where the power comes in and after 
> warm up try spraying this with some kind of "freeze spray" to see if 
> the problem comes back. replace tha cap that when chilled causes the 
> probalem to come back. Probably replace the power supply cap just 
> because... (higher value is ok)

Btw, the unit showed the same behavior when I plugged in a floor fan on 
the same line. And at this point it's misbehaving even when the room 
heater is turned off, so yes, I'm thinking that the Omni I/O is busted. 
Fortunately I have an older simple break-out connector for the card, 
I'll take a look at the box in the meanwhile.

Thanks for the tips, Len, I'll let you know what happens.

Best regards,


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