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I used this trick on my two x 3-1000z amplifier. I cut and wound a flat coil and placed it as you suggested. Higher frequencies gained a ton of power. Before my C1 cap was always min.

C

HEC? (high energy? corp) has? detailed? current? vs? freq? info).

For? 10-10? YC-156? amps,? use? 4 x? HT-57's.? ?200 pf? are? the? go? to? standard.? ?The? 200? pf? HT-57? will? easily? handle 15A? @ 32 mhz.?

800? pf? is? ample,? even? for? 160m.??

The? YC-156? ends? up? being? aprx? 52 pf? from? anode? to? chassis,? once? bolted? to? chassis.? ?The? tube? provides most? of the? tune? C...with the? tune? cap? being? a small adjustable? padder? in? parallel.? Problem? is, the plate? block? cap? is between? the? anode and the? tune? cap.? Since? the? tube? C has? most? of the? RF? current? flowing? through? it...vs? the? tune? cap,? all? that anode to? grid? Current? now? has? to? also? pass through the? plate? block? cap? assy.? ?That's? where? the plate block? caps? are? stressed...? on? 10m ...and? upper? bands.?

Install a strap? coil? between? plate? block? cap assy? and the tune cap..to? reduce? plate? load? Z.? Then a PI? net? with a normal? loaded? Q can? be? used.? You? can? see? that? effect? asap? when? playing? with the? GM3SEK? PI spreadsheet.

I? posted a pix? of buddy's? 80-10? YC-156? amp? under the? photo? page.? ?The? 160m? monoband? YC-156? also? uses 4 x? HT-57's...also? 200? pf? each,? 800 pf? total.??

Jim? VE7RF

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