[Amps] AL-811H how do you neutralize a set of 572s in this amp?

[Tom Tishken KD4WOV AAV4DX]

Hello Everyone,
  I am not familiar with this amp, but another ham owns this amp. He had 811a tubes in it. He wants to run the 572b tubes. he installed the 572b but it is very very easy to set off into Osc. on 15, 12 and 10 meters.
  Is there any way to adjust the neutralization with this amp? If not what would be the best way to add it?

de KD4WOV Tom

De Tom Tishken
KD4WOV Ham Radio
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