Don Sach's pre amp

@highstream Wish I could comment more about preamp options, but the DS pre is my first. Prior had run DAC direct from the PWD and DSD. Like you said, adding in a preamp is really a huge improvement. Counterintuitive as it may be. My reading did convince me that any relatively simple preamp circuit either based on 6SN7s or DHTs would be optimum. I suspect many of the simple 6SN7 pres (Supratek, the DS kit, deHavilland, etc.) would all be excellent and more similar than different.

Also, just checked my pre's height and it looks to be under 8" tall with tubes (and some vibration control).  A little hard to check inside the cabinet.

Has anyone tried Grant Fidelity's Treasure Globe 6SN7-SE?

Maybe ask Don Sachs if he's tried them?

for the record the circuit used in the SP-14 is a direct copy of John Broskie‘s Aikido as published in the Tubecad Journal. This circuit has since been used by Don Allen. No credit has been given to Mr Broskie for using his design by either constructor.