Use 4 Siemens in my LS-15. With infini cap upgrade and try DIY power cables. Now I am comparing this one to BAT VK30, which is pricer using 6 Jan Philip tubes now. I prefer LS-15's middle frequency over BAT. BAT has better bass control than LS-15. Siemens improve the high and low end, IMO.
Now, plan to keep LS-15 and sell BAT (both are very nice preamp's). I did not have 6 Siemens to put in BAT for a more complete comparison. But I am pretty happy the way LS-15's sound now and will keep it as now for some time.
Now, plan to keep LS-15 and sell BAT (both are very nice preamp's). I did not have 6 Siemens to put in BAT for a more complete comparison. But I am pretty happy the way LS-15's sound now and will keep it as now for some time.