Please Read and express your feelings and opinions....

Thanks Al, I didn't know that older VAC amps have variable feedback.  

My 125 watt Class A/B tube amps also have variable global negative feedback at reportedly 4,6,8 and 10 db.  My similarly high efficiency speakers, unlike yours, have a difficult impedance curve with low impedance in the bass (3.2 ohms).  I set my feedback to 4 db, or minimum.  Until I improved my system with the SR fuses and Total Contact, I used to set it to 6 db for CDs and 4 db for LPs and 78s.  Now everything sounds open and tonally firm at 4 db.  

If I were to replace my amps, I would probably buy the VAC 200IQ.

@geoffkait 
Please, Geoff, enlighten the unwashed masses here as to what this "sufficiently advanced technology" is that appears to us as voodoo. 

@kosst_amojan

You mean you don't understand geoffonese? 😁

kosst_amojan
@geoffkait
Please, Geoff, enlighten the unwashed masses here as to what this "sufficiently advanced technology" is that appears to us as voodoo.

Oh, I dunno, costco, but I suspect in your case it could be just about anything that looks at you a little cross-eyed. 🙄

Pop quiz. Multiple choice. Oh boy, oh boy!

Which of the following are not woo?

a. Green Pen
b. Mpingo disc
c. Silver Rainbow Foil
d. Tice Clock
e. Intelligent Chip
f. Demagnetizing CDs

@geoffkait 

Wow... Ya got me there. School us, oh great and wise Geoff. Show us the errors of our measurement ways! Open our eyes to the 7th dimension and allow us to gaze upon your majestic madness!