[GregC]

I have a Dodd inline tube buffer for sale.  This has a mute circuit for when you turn it on, a bypass switch so you can have the unit turned off and bypass the buffer circuit, Mundorf Silver in Oil caps, and a new old stock 6H30-DR super tube (with very low hours).  This can sit between a component such as a phono stage where you can engage the tube buffer if you want, or it can sit between a solid state preamp and the the amps so you can choose to engage the tube buffer or bypass it based on your listening preference at the time.  This runs off a CTEK charger and a PS-12120F2 12 volt 12 amp battery.  The tube sound is subtle but noticeable.

Here are pictures of the actual tube buffer for sale.