Hi! In a few weeks, I plan on purchasing a VTA SP 14. I have an AVA Fet Valve 400R amplifier. The 400r has an input impedance of 1M ohms. I need to know the perfect coupling size cap for optimal performance with the SP 14. Any help would be very much appreciated.

1M ohm = 1000k if that helps

The 400R runs class A up to about 20W/channel.

Rated power is 225 W/Channel into 8 ohms, more into 4 ohms.

The voltage gain of AVA power amps is about 25

It takes 2V to drive the 400R to full power

The amps also have a very high input impedance so they are easy loads for a preamp to drive.

The input impedance is 1 megohm, it's a triode input

according to Frank

1M ohm = 1000k if that helps

The 400R runs class A up to about 20W/channel.

Rated power is 225 W/Channel into 8 ohms, more into 4 ohms.

The voltage gain of AVA power amps is about 25

It takes 2V to drive the 400R to full power

The amps also have a very high input impedance so they are easy loads for a preamp to drive.

The input impedance is 1 megohm, it's a triode input

according to Frank

Last edited by bscp on Sun Feb 24, 2019 10:46 pm; edited 1 time in total (Reason for editing : explanantion)