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A couple tell tail signs:

73.78.200.105

In Reply to: RE: Question of the week posted by suekraft on July 26, 2018 at 21:29:47

In general:
Class A:
- Heavy due to robust power supply required for continuous high power draw.
- Case or heatsinks very warm to hot just sitting idle after an hour.
- If you measure it's power consumption at the AC outlet a Class A amp will be drawing a significant amount of power (Watts) even if it's just sitting there idle not playing music. Could be as high as 100 Watts or upwards of several hundred Watts at the AC outlet depending on the power output rating of the amp.
Class D:
- Most Class D amps are relatively lightweight with the exception of those that use a linear power supply and/or unnecessarily massive casework. Most Class D amps use switching power supplies.
- Case should be cool to barely warm to the touch whether sitting idle or playing music for an hour.
- If you measure it's power consumption at the AC outlet a Class D amp will be drawing a very small amount of power (Watts) sitting idle and not playing music, probably under 10 - 20 Watts
One easy way to tell is to use a AC Watt meter:

AC Usage / Wattmeter (Open in New Window)

Edits: 07/27/18

Follow Ups:

RE: McCormack DNA-1 - jaynemo 06:52:23 07/27/18 (5)
As one example, Class A, left on 24/7, draws about as much power as a 100W light bulb and stays relatively warm to the touch. With central air that has been on since May and a pool filter running almost 24/7, there is nothing "green" about my house!
- RE: McCormack DNA-1 - Caucasian Blackplate 08:24:40 07/27/18 (4)
  The DNA-1 is neither a class A nor a class D amplifier.
  - RE: McCormack DNA-1 - jaynemo 08:31:25 07/27/18 (3)
    I thought it was a Class A, thanks for pointing that out...Its currently at SMc for the GS-18 upgrade including a new Plitron X-former. I was looking for a high current SS amp to drive a pair of German Physiks Borderland MK1's that needs high current and the combination is excellent!
    - It's A/B - Awe-d-o-file 13:15:55 07/27/18 (1)
      Like the CJ SS amps. Made in the same building
      
      ET
      
      "If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936
      - DNA-1 (not in production for decades) was made in CA, not in a CJ facility. nt - Rick W 12:58:45 07/28/18 (0)
        
        In Reply to: RE: It's A/B posted by Awe-d-o-file on July 27, 2018 at 13:15:55
        
        nt
    - RE: McCormack DNA-1 - Caucasian Blackplate 11:53:09 07/27/18 (0)
      Yeah, that amp will push plenty of current if you need it.
      
      It's very rare to see a class A solid state amp that's stable with a 2 ohm load (unless the output is transformer coupled)

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