About 65-70W to get 600W (no further increase at 80W)
Dave
NR1DX
On 6/5/2020 11:13 PM, Richard Solomon wrote:
How much drive for 600 out ?
73, Dick, W1KSZ
On Fri, Jun 5, 2020, 8:10 PM Artek Manuals <Manuals@artekmanuals.com
<mailto:Manuals@artekmanuals.com>> wrote:
I have enough HF amps here (four at last count) One of them is an
ancient SB-220 , so I thought what the heck I would "hack" it and
turn
it into a 6M single band. I have a folder� full of articles on how to
from the last 20 + years.
All done "physically" but try as I may I can not get more than about
600w out .
1) Two different tank circuits , one with a section of the original
10/15� coil from the SB220 and a 2nd one with a a piece of flat
copper
strap ...no difference
2) Changed the parasitic chokes
3) Tried� "T" input match. Pi input match , straight through ...no
difference
4) Plate voltage is 2400 unloaded and about 2050 loaded in CW position
5) Bias measures 6V
7) Has new Hardbach bias and diode and metering board
8) Older set of Eimac 3-500Z and newer set RF Parts 3-300ZG ...no
difference
What am I missing, ?
What else to try?
Dave
NR1DX
manuals@artekmanuals.com <mailto:manuals@artekmanuals.com>
-- Dave
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www.ArtekManuals.com <http://www.ArtekManuals.com>
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Dave
Manuals@ArtekManuals.com
www.ArtekManuals.com
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