[Spectral Balance Control repair / replacement]

Quote

Frank, Thanks for your reply. I've double checked the hex grub screws carefully. I have two pairs of LST IIs and have been able to attach the control knob on three of the four speakers after having changed the grille fabric. Just to rule out the potential that the grub screws might be worn on the spectrum control that isn't working properly, I've just received two sets of the screws from Vintage-AR. (Very luck to have the resources they provide.) I checked the nut securing the spectrum control to the cabinet . It appeared tight. I was able to tighten it a bit further but it had no affect on the operation of the control switch. Is it possible to access the control unit by removing the woofer and removing the securing nut? I'm hoping that might allow me to determine whether damage has been done to the control unit. I'm cautious about doing so as I'm hoping to avoid repairing the spectrum control and a woofer! I appreciate your knowledge and advice!

 

[Spectral Balance Control repair / replacement]

One of my LST II speakers has a spectral balance control that simply spins when turned rather than stopping at each of the three settings. Is there an way of repairing the control or replacing it? This is my first posting and I'll be grateful for any assistance you can offer. Thank you!