Why do you want to change it when it's apparently healthy?
Can be almost anything, impossible to distinguish e.g. rectifier or zener diode, voltage and current rating. You might try to decode the marking, e.g. color rings, or analyze the circuit to determine the diode's role and expectable spec.
There are 4 identical diodes, but one is burnt. They are smd, this is a musical amplifier with two identical channels. There is no marking, no scheme...
Output Power / Channel: 15 Watt
(Philips DSS 370)
Yes, Diodes are connected around transistors of the end step of the amplifier.
They are connected in series, one against another, and then they have a resistance of 1000 kilos.
They have a resistance in series with them of 1000 k ?
By diodes connected around transistors, I meant they are connected right in parallel with the transistor, that is, from source to drain of each one of them, is this right ? What else do they have connected (electrically connected) to them ? The output inductor (if there is any) ?
It would be nice if you can sketch the surrounding circuitry. (does not need to be nice, a hand sketch is good)