[Amps] Ameritron and Steppir

[Todd Ruby]

I have an ameritron al 1200 and a 4 el steppir. They both preform 
beautifully except for one curious thing. On 20 I can not get more than 
600w output with 100w of exciter power. On a dummy load I get the full 
1.5 kw with 100w of exciter power. SWR is flat and I have no trouble 
getting 1.5 kw on other bands with as little as 55 watts on 17m

I would appreciate any ideas to help me solve this puzzle

tnx



73
de
todd
WB2ZAB