7025WA TAD selected preamp tube (RT080) ECC83WA TAD selected preamp tube (RT008) 7025 TAD selected preamp tube (RT010) 12AX7AC TAD selected preamp tube (RT001) 7025S TAD selected preamp tube (RT011) 7025/E83CC TAD selected preamp tube 7025 / E83CC (RT030) ECC83Cz TAD selected preamp tube (RT003) ECC803S TAD selected preamp tube (RT033) 12AX7WAR TAD selected preamp tube (RT006) 12AY7 TAD selected preamp tube 12AY7 / 6072a (RT007) 12AY7HG TAD selected preamp tube 12AY7 / 6072a high grade (RT070) 5751 TAD selected preamp tube (RT009) 5751HG TAD selected preamp tube (RT090) 12AT7 TAD selected preamp tube 12AT7 / ECC81 (RT002) 12AU7 TAD selected preamp tube 12AU7 / ECC82 (RT005) 12AU7WA TAD selected preamp tube 12AU7WA / E82CC (RT065) 12BH7ASTR TAD selected preamp tube (RT043) 12DW7 TAD selected preamp tube 12DW7 / 7247 (RT044) EF86 TAD selected preamp tube EF86 / 6267 (RT-EF86) 6922 TAD selected preamp tube 6922 / E88CC (RT-6922) 6SN7GT TAD selected preamp tube (RT980) 6SL7GT TAD selected preamp tube (RT-6SL7)