[Amps] SB-220 6M conversion

[Artek Manuals]

Roger

1)See Item #3 in original post !!
2) 3KV under load ???
3) What are you using to measure power out ?
4)What did you use the to measure the plate voltage? The meter on SB220 
or some other source?

Dave
NR1DX




On 6/6/2020 1:28 AM, Roger - W7TZ wrote:
> My recently purchased conversion has a tuned input where the band 
> selector was. 3kv plates, 50w input gets me ~1kw out.
>
> 73, Roger
> W7TZ
> CN83ia
>
>
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>
> On Fri, Jun 5, 2020 at 8:47 PM Artek Manuals <Manuals at artekmanuals.com 
> <mailto:Manuals at artekmanuals.com>> wrote:
>
>     Agree in principle..QSK on 6M not that important
>
>     Dave
>     NR1DX
>
>     On 6/5/2020 11:30 PM, Jim wrote:
>     > Good article except for tearing out the original relay. Not
>     necessary,
>     > unless you want to use QSK or hate the sound of loud relays
>     (like I do).
>     >
>     >
>     > Thanks
>     > 73
>     > Jim W7RY
>     >
>     > On 6/5/2020 10:24 PM, Adrian wrote:
>     >> Have you seen this one Steve ?� ;
>     >>
>     >> http://www.arrl.org/files/file/Technology/QST_Apr_2008_p38-40.pdf
>     >>
>     >>
>     >> On 6/6/20 1:10 pm, Artek Manuals 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>
>     >>>
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>     -- 
>     Dave
>     Manuals at ArtekManuals.com
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>
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-- 
Dave
Manuals at ArtekManuals.com
www.ArtekManuals.com