Call Rogue and find out which small tubes are in the gain stage, this would affect the hiss in the speakers the most. Then do as TVAD & Rodman99999 suggested and call either upscale audio, Brent Jesse, Jim McShane or Vintage tube services and get Phono grade tubes. Any brand of tube will lower your hiss in your speakers as long as they are low noise phono grade.
Tube Amp Noise with Klipsch Cornwall II
I just bought a pair of Klipsch Cornwall IIs for my Rogue Cronus integrate amp to replace a pair Spendor S3/5 SEs. Wow - bigger speakers are amazing. BUT now there is hiss coming through both speakers which can be heard 10 feet away - at all settings, even with volume all the way down.
The tube set is:
4 KT77s - which Rogue had made
3 - Electro Harmonix 12AU7s
2 Sovtek 12AX7LPS
Can anyone suggest how to lower my amp noise floor so I can enjoy these speakers?
The tube set is:
4 KT77s - which Rogue had made
3 - Electro Harmonix 12AU7s
2 Sovtek 12AX7LPS
Can anyone suggest how to lower my amp noise floor so I can enjoy these speakers?