On 25/01/2016 22:13, Gareth Magennis wrote:
Hi,

this is really annoying, but a good opportunity to learn something useful.

I have an old Urei Power Amp that needs its DPDT 10A speaker output
relay replacing.
It's annoying because the relay fitted has a totally non conventional
pin configuration, so the usual generic cheap replacement is going to
involve drilling holes in the PCB and isolating pads and using glue and
stuff because some solder pads will have to go etc.

So I thought about maybe using Solid State relays, which should be
physically smaller and lighter, and could be mounted in little patches
of available free space.


I've never seen a solid state relay in a Power Amp. Maybe there's a
good reason for that - AC transmission, Inductive loads, back emf etc.
A quick look at Farnell shows you don't generally get DPDT ones, so you
need 2 for a stereo amp, and they are not that cheap.


Any experience welcome.



Cheers,


Gareth.




hard wiring a big relay or two, to wherever there is space in the amp?
its not as though it is switching RF