Dual Triode Grading System: All RAM Tube Works dual triodes are tested and graded using our proprietary tube testing computer developed by Roger A. Modjeski. The following grades are available in all dual triode types. Super Low Noise (SLN): Quite simply the industry’s quietest tube, suitable for the finest phono stages as well as any other critical application. Low Noise (LN): A superior tube especially tested for today’s quality line stages. Standard Grade (SG): Our most economical tube, yet still a product of selection. In fact, it easily outperforms the best tubes offered by other companies. 6CG7/6FQ7/6GU7 - Standard Grade $30.00 6CG7/6FQ7/6GU7 - Low Noise $40.00 6CG7/6FQ7/6GU7 - Super Low Noise $50.00 12BH7 - Standard Grade $30.00 12BH7 - Low Noise $40.00 12BH7 - Super Low Noise $50.00 6350 - Standard Grade [Currently out of stock] $30.00 6350 - Low Noise [Currently out of stock] $40.00 6350 - Super Low Noise [Currently out of stock] $50.00 7044 - Standard Grade $30.00 7044 - Low Noise $40.00 7044 - Super Low Noise $50.00 6BQ7 - Tested/Selected for Minimum Offset for RM-200s $37.50 6922 Super Low Noise V1 for RM-9 MK1 and MK2 $120.00 6922 Low Noise V1 for RM-9 MK1 and MK2 $90.00 6DJ8 Super Low Noise V1 for RM-9 MK1 and MK2 $90.00 6DJ8 Low Noise V1 for RM-9 MK1 and MK2 $70.00 Enhanced Minimum Offset Upgrade for RM9 V1 $15.00 Premium Minimum Offset Upgrade for RM9 V1 $30.00 6BQ7 For RM200 $50.00 Need assistance? Email tubeaudiostore@gmail.com or call 805-687-2236. Photography by VisionQuest Photography