Date: Mon, 18 Apr 2016 19:19:35 -0700
From: Clark Turner <Clark@ClarkTurnerTuning.com>
To: amps@contesting.com
Subject: [Amps] Dual 3-1000Z amp problem
I just finished my Dual 3-1000Z GG amplifier. I have an odd issue now
that I cant seem to figure out. The amp will do 2KW with 40 watts of
drive on 80 meters. Additional drive does not add any power out. 100
watts input does 2kW out. The Input SWR is low at 1.2 to 1. The plate
current DOES increase, But there is no additional output.
I had this amp running before with 4-1000 and 3-1000s and some of you
remember, I turned the roller inductor on accident when I was trying to
reach for the load turns counter. That toasted the plate choke. I
replaced that choke and while I was in the amp, I installed RF parts
RFC30 chokes instead of the HB ones. I was having high input on 80 so I
changed them out. That is fixed but I now have this new issue.
Any idea where to go? This condition exists on 40 and 80. 2KW easy.
But then it wont make more.
## what wattemter are u using ? what is the ant, or is this a dummy load ?
If plate current rises, and no increase in PO, ur PD would be sky high.
Does ur grid current also rise ? Is either the tune or load cap maxed out
on 80 or 40m? Is it a PI or PI-L on 80 + 40M ? U sure u have the
tank coil taps in the correct place?
## a 3-1000Z is rated for 6 kv. You should be able to make stupid power
on any band.
## OK, so the issue is only on 80+40m. But its good on all other bands.
How much does it put out on the other bands ??
## I have seen a few cases of bad slugs on bird wattmeters, but that is rare.
Jim VE7RF
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