Rob wrote:

Eeyore wrote:
TonyL wrote:

I've found a couple of HY60 amplifier modules in my junk box. I have a data
sheet which indicates a +/- 25v power supply voltage rails requirement but
no indication of current. Power into 8 ohms is 30W. If I put a power supply
together what sort of current should I be expecting to supply to each
module ? Presumably, a simple dual rail transformer/rectifier/electrolytic
type of supply would be OK ?

Yes.

You can work out the current for yourself of course, but then it varies
depending on whether you plan to drive it hard continuously or just play light
orchestral.

Do you think most off the shelf amplifiers are designed to be driven
hard continuously, and if not, how is the sound affected?

Professional ones like I design are.

The sound is affected in the worst case by its absence followed by a burning smell.


I still don't understand this 'all modern amplifiers sound the same'
thing - hence the question!

Well they don't. For a host of reasons, the simplest being that not all have as flat
a frequency response as others. Most valve amps' freq resp varies significantly with
load impedance dips and peaks (like speakers) due to relatively high output
impedance (it forms a filter) and would you expect an amp with 2% THD like some
audiophool SE tubed/valve ones to sound like an amp with 0.003% THD ?

Graham