I was thinking of using the Loudnes switch or the filter switch for it.
A switch can be used for bass circuit. But ......, how to disconnect treble control ?.
Dedicated to the restoration and preservation of all original Dynaco tube audio equipment - Customer support for Dynaco VTA tube amp kits, all Tubes4hifi.com products and all Dynakitparts.com products
Peter W. wrote:There is a gentleman named Mark Oppat (AKA the King of Kontrols)
Who may be able to fabricate a control that would accomplish the center-null function of the X-type tone control. He has the ability to make up parts from individual sections. And so might be able to cut the carbon ring in a typical control to create that null.
Worth asking. And if he can, he might get quite a bit of demand from this venue alone.