While I'm not quite sure what is going on for Tom, I'm pretty sure he is 
referring to the T/R relays in the amp, not any sort of protection 
circuit relay.  Since he did buy the amp used, it is remotely possible 
it has an optional grid protection  circuit installed, but I would 
really doubt it.  I don't think there are any relays on that board and 
you would have to  flip the standby switch off and on to reset it and 
get output from the amp after a trip.

73, Steve KW3A

On 3/10/2014 6:52 AM, Tom Behler wrote:
> Butch:
>
>
>
> Well, I'll have to look at the book, but I find that it occasionally
> happens.
>
>
>
> Yesterday, for the 20-meter net, I kept the input power to 60 watts, and
> carefully adjusted the ALC, and had no problem.
>
>
>
> Tom Behler: KB8TYJ
>
>
>
>
>
> -----Original Message-----
>
> From: For blind ham radio operators [mailto:[log in to unmask]]
>
> On Behalf Of Butch Bussen
>
> Sent: Sunday, March 09, 2014 10:15 PM
>
> To: [log in to unmask]
>
> Subject: Re: need to find a replacement radio
>
>
>
> Why would the relays trip?  I didn't think that amp had that kind of
> protection circuit.  I ran my 590 at 100 watts driving my solid state metron
> and never had any issues.
>
> 73
>
> Butch
>
> WA0VJR
>
> Node 3148
>
> Wallace, ks.
>
>
>
>
>
> BTW, it had no alc hook up.
>
> 73
>
> Butch
>
> WA0VJR
>
> Node 3148
>
> Wallace, ks.
>
>
>
>
>
>
>