Which slots?Ordered two low noise preamp tubes

[primeholy]

I been having lots of feedback on channel 3 in mark iv mode with the bright switch engaged. I ordered two preamp tubes to help with this, but which slots should I put them in?

 

[eudaimonia02912]

I'd start with V1 and V3. If that doesn't work, move V3 to V7.

 

[primeholy]

I'd start with V1 and V3. If that doesn't work, move V3 to V7.

Thanks!

 

[eudaimonia02912]

No problem. If this doesn't work, I'd try V5, then V4, then V6, in that order.