Question about Fet/valve preamp

rotarius · « **on:** 11 Nov 2005, 03:05 am »

Hello, I have an older FET/valve hybrid pre with a phono section. I don't have a TT so I was wondering if I could just remove the 2 tubes of the phono section. This little thing runs pretty hot with the 4 tubes, hence the question.

Darius

avahifi_lj · « **Reply #1 on:** 11 Nov 2005, 02:02 pm »

Hi:

I don't recommend removing the tubes in older FetValve preamps as the power supply is balanced for all of the tubes and Fets in both circuits.

Larry

avahifi · « **Reply #2 on:** 14 Nov 2005, 01:49 pm »

do not run older Fet Valve amplifiers with tubes removed as that can cause the power supply voltages to go too high and possibly cause circuit damage.

Frank Van Alstine