[Elecraft] K3 SSB on 40M

[Nick Henwood]

Can't get proper output on 40M SSB. Rig works fine on all other bands. On 40M gives full output on CW but when switched to SSB although the Comp and ALC readings are OK (i.e.as for all other bands) but there is very little RF output. Can't think of anything which is specific to 40M which I have switched on or off. Any ideas please (I don't use SSB much!)?
73 Nick G3RWF