Yes, there was to the Predriver board. The Transmit Exciter is a completely different board. Both Predriver version are covered in the service manual.
73
-Jim
NU0C
On Fri, 10 Mar 2023 19:21:18 +0000
"Rob Sherwood" <rob@...> wrote:
Decades ago on a mobile trip from CO to ME my TR-7 quit transmitting. I was in Ohio so Drake replaced the driver board. I think there was a significant upgrade to the replacement board. Rob, NC0B
On Mar 10, 2023, at 11:21 AM, Jim Shorney <jimNU0C@...> wrote:
?
I suspect the difference is largely cosmetic. Drake started using boards with solder mask in later years. These will have a green coloring while earlier boards are bare tinned copper. A surf of eBay offerings confirms this. Other than the solder mask and packaging of some components they look pretty much the same.
73
-Jim
NU0C
On Fri, 10 Mar 2023 06:34:46 -0800
"Dave Cutts via groups.io" <g4faw@...> wrote:
Thanks Rob,any idea where I can get details of it? my manual only shows one version, Its very similar...
Thanks Dave G4FAW
Jim Shorney