[Johnson] Start of New Year

[Al Parker]

Good New Year, David,
	Or maybe not quite good?  I can sympathise with you, I don't like the 
idea of working on my Inv 2000 either, but at least it's operating posn 
is in the shop, so tools and 240vac are right there.  But it's 
underneath a shelf, so not much work clearance o'head.
	Maybe your problem is simpler than you suspect.  Sounds to me like it 
could be just lack of drive to the final, since you just don't get any 
increase in idle current when you try.  Does the finals' grid current 
change when you vary the drive?
	I don't operate mine often enuf to remember things, but there is a 
mechanically operated switch between the driver section and the final 
amp secn so you can operate "barefoot".  Maybe that got moved?
	I hope it's something as simple as that.  Keep us posted.
73,

Al, W8UT
www.boatanchors.org
www.hammarlund.info

"There is nothing -- absolutely nothing -- half so much
worth doing as simply messing about in boats"
Ratty, to Mole

On 1/1/2015 9:25 AM, David C. Hallam wrote:
> I looks like I have a major project on my hands.  My Invader 2000 gave
> up yesterday and has no output.  My first guess is the amp output
> circuit.  The driver loads properly and the finals draw current as
> indicated on the grid, screen and plate meters.  But, there is no
> indication of output.  Plate voltage and the zero signal plate current
> are OK The antenna system is OK as the receiver works but I will check
> out the coax change over relay first.  Beyond that things get difficult.
>
> I do not have 240V at my garage workshop and the Invader is too heavy
> for me to move anyway.  Just had arthroscopic surgery on my shoulder. At
> 60+ lb for the transmitter and 100+ lb for the power supply I couldn't
> manage it anyway.  I have to completely tear down my operating desk and
> move test equipment in from the garage.  Not a happy start for the new
> year.
>
> David
> KW4DH
>