Ron D. wrote:

Audio load: http://www.mcmelectronics.com/product/28-048
(No mention of tolerance)


** I use the same resistors for all amplifier bench testing.

Submerged in water, they can handle 1000W each.

Using a pair and a simple switching scheme gives 4, 8 and 16 ohms.


Scopes have a lot of errors.

** That's a a bit harsh.

Many analogue scopes manage 2% accuracy for time and amplitude & modern DSOs
have on-screen displays of the same parameters with better than 1% accuracy.

A DVM may work, but pay attention to frequency response.


** Most can be trusted to about 1kHz on sine waves.


..... Phil