Echoplex EP-2 Regeneration Issue

Hi Folks,

Wondering if you have any insights on my Echoplex problem. This is an early-version EP-2, no Sound-On-Sound. The issue is that it won't go into regeneration. The "Echo Repeat" circuit feeding V2B looks admirably simple, and I doubt the issue is a bad 1 Meg resistor Any other places you'd check?

Many thanks!
 

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> I doubt the issue is a bad 1 Meg resistor

Or R6?

Seems easy enough to tack a 470k from top of pot to V2B grid. If that causes mega-regen then the culprits are obvious and can just all be replaced.