Re: [Amps] SB-220 6M conversion

[Artek Manuals <Manuals@ArtekManuals.com>]

Running in the CW position just to be on the safe side ( after all this 
amp is nearly 40 years old) Going easy on the power transformer. I can 
only get about 100 more watts in SSB position
Dave
NR1DX

On 6/6/2020 8:53 AM, Steve London wrote:
> Why are you running it in the CW position, instead of the SSB position ?
>
> 600 watts out in the CW position, with the HV you are seeing, doesn't 
> sound far off.
> 73,
> Steve, N2IC
>
> On 06/05/2020 09:10 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@artekmanuals.com
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--
Dave
Manuals@ArtekManuals.com
www.ArtekManuals.com


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