7308 E188CC CV4108 CV4110 CV4109 premium grade tubes are rated for higher voltage and dissipation (250V/2.0W versus 220V/1.8W for E88CC/6922 and 130V/1.8W for 6DJ8/ECC88). Designed for longer life, low noise and lower microphonics, these can be used for all ECC88/6DJ8 and E88CC/6922 applications. Also check PCC88 7DJ8 Category.
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