Audio GD HE-1 XLR 10 tube Pre from Underwood HI FI....It has it's own Regenerative Power Supply that makes it's own power from the outlet...none of the units you list have this technology...Game changer for 2 channel SQ.........$5,000 Read the Part Time Audiophile review.....The best under $12K he's ever reviewed !
PREAMPLIFIER UPGRADE QUESTION
My system consists of the following:
1. Martin Logan Impressions 11A
2. Rogue RP-1 preamplifier
3. Lumin U@ mini streamer with Chord Qutest DAC.
4. Bryston 4B3 Cubed power amplifier
I just purchased the Bryston amplifier and it has brought my speakers to life. From dull and listless to vibrant and alive.
I would like to upgrade my preamp and my three choices are as follows:
1. Rogue Audio RP-9-tubes
2. Bryston BR-19 which is fully balanced.
3. Conrad Johnson ET6 or ET6SE
My cables are Cardas Clear Cygnus
Any thoughts or suggestions would be appreciated.