6DJ8 ECC88 6922 AMPEREX BUGLE-BOY FAMOUS RARE HOLLAND MATCHED PAIR TUBES 1964 (# 297402096968 ). NOS ECC88 6DJ8. The Δ 4 BUGLE-BOY Heerlen production is particularly sought after for its combination of warmth and resolution.
6DJ8 ECC88 6922 AMPEREX BUGLE-BOY FAMOUS RARE HOLLAND MATCHED PAIR TUBES 1964 (# 297402096968 ). NOS ECC88 6DJ8. The Δ 4 BUGLE-BOY Heerlen production is particularly sought after for its combination of warmth and resolution.