[Amps] 144 MHz GS35B update

[N1BUG]

There we go. After reviewing pictures of several other amplifiers 
using this tube I removed one more turn from the coil on the tube 
side of the T match. Input SWR is 1:1 and the amp is making over 600 
watts out with 25 watts in. I plan to run it this way for a while 
before I go for the real QRO.

Paul


On 05/01/2017 02:40 PM, N1BUG wrote:
> I'm seeing more RF output with the new configuration, about 500W for
> somewhere around 25W drive. It appears I am going to have some fun
> getting the input SWR down but I guess everyone does. That's
> probably why there are so many slight variations on coil dimensions
> among the various plans.
>
> My first try with both coils having 5 turns 15mm ID, 20mm long
> resulted in minimum SWR of 3:1. My second try with 4 turns 15mm ID,
> 20mm long got it down to about 2.6:1. I am not sure whether to take
> another turn off both coils or perhaps just the one on the tube
> side. Many pictures of amps I have seen appeared to have less L on
> the tube side although I don't see this mentioned in any
> accompanying text.
>
> Paul