Howard,

There is a 7 pin din on the rear of the radio for amp connection.   The 
  relay in the amp is 12 vdc and low current.   Not familliar with your 
amp, but a lot of the older stuff used high voltages for keying. 
Proceed with caution.   There is also a menu in the radio that needs to 
be enabled to allow amp keying.

73, Steve KW3A

On 11/30/2014 1:59 PM, Tom Behler wrote:
> Howard:
>
> To be sure, you might want to get an ARB704 buffer box for this purpose.
>
> They are available from the usual ham equipment dealers for, I believe,
> around $50 or so.
>
> Just be sure you tell the dealer what you are trying to do, so they give you
> the correct interface cables.
>
> Tom Behler: KB8TYJ
>
>
>
>
> -----Original Message-----
> From: For blind ham radio operators [mailto:[log in to unmask]]
> On Behalf Of Howard Traxler
> Sent: Sunday, November 30, 2014 1:41 PM
> To: [log in to unmask]
> Subject: RF power amplifier with the TS-590
>
> Seems to me there's a connector on the back of the 590 for keying the =
> power amp.  Should one worry about current and/or voltage employed to = key
> the amp?  I have a Dentron Clipperton L that I'd like to use with = the 590.
> Maybe I should have an intermediate relay to key the amp, huh? =  Any ideas,
> please?
>
> The Other Howard, WA9RYF
>
>
>