Yamaha Vintage Yamaha C-50 Natural Sound Stereo Control Pre-Amplifier Fully Tested Buy-Now Price: $225.0Market: eBay Post navigation EICO # EL-84 / 6BQ5 AMPLIFIER VACUUM TUBE / TESTED On B&K 625Elac debut B5 View Comments 3 weeks ago Related Posts VINTAGE Yamaha RX-V995 Black Natural Sound 5.1 Channel AV Receiver Yamaha RX-V480 Natural Sound Receiver 220 W Works Yamaha A-520 Natural Sound Stereo Amplifier TESTED