[Amps] SB-220 6M conversion

[Artek Manuals]

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 at artekmanuals.com 
> <mailto:Manuals at 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 at artekmanuals.com <mailto:manuals at artekmanuals.com>
>
> -- Dave
> Manuals at ArtekManuals.com
> www.ArtekManuals.com <http://www.ArtekManuals.com>
>
>
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-- 
Dave
Manuals at ArtekManuals.com
www.ArtekManuals.com