Eastham
More Class-A than ever!
So my 620 has now started coming out of protection to early causing a negative spike at the speaker terminals, it happens from a cold start after it's been off for a while or if I turn the receiver off then back on after a second.
When it comes out of protection normally it takes around 3.5s for the relay to close when it opens to early it takes around a second to 1.5s to close.
Voltages at TR809 are as follows:
Base: 21v while relay is open, 12.5v after the relay closes
Collector: 0v while relay is open, 13.22 after the relay closes
Emitter: 21.5v while relay is open, 13.28v after the relay closes
Any ideas what I should check?
When it comes out of protection normally it takes around 3.5s for the relay to close when it opens to early it takes around a second to 1.5s to close.
Voltages at TR809 are as follows:
Base: 21v while relay is open, 12.5v after the relay closes
Collector: 0v while relay is open, 13.22 after the relay closes
Emitter: 21.5v while relay is open, 13.28v after the relay closes
Any ideas what I should check?