selected power tubes, old Style 6L6WGC-STR, pair (RT812-OS)
selected power tubes, old Style 6L6WGC-STR, quartet (RT814-OS)
selected power tubes PSVANE EL84, pair (PS-EL84-MP)
selected power tubes PSVANE EL84, quartet (PS-EL84-MQ)
selected power tubes, sextet (RT886)
selected preamp tube PSVANE ECC83, matched for symmetry (PS-ECC83-SYM)
