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71A BALLOON ENVELOPE TRIODE BY TRAIL BLAZER = UX171A = CX371A = CX71A = UX-71A = ER71A = ER171A = AC4 = X-171A = 471A = T71A = MX171A = 171A = 171AC = SX171A
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71A BALLOON ENVELOPE TRIODE BY TRAIL BLAZER = UX171A = CX371A = CX71A = UX-71A = ER71A = ER171A = AC4 = X-171A = 471A = T71A = MX171A = 171A = 171AC = SX171A 71A BALLOON ENVELOPE TRIODE BY TRAIL BLAZER = UX171A = CX371A = CX71A = UX-71A = ER71A = ER171A = AC4 = X-171A = 471A = T71A = MX171A = 171A = 171AC = SX171A 71A BALLOON ENVELOPE TRIODE BY TRAIL BLAZER = UX171A = CX371A = CX71A = UX-71A = ER71A = ER171A = AC4 = X-171A = 471A = T71A = MX171A = 171A = 171AC = SX171A 71A BALLOON ENVELOPE TRIODE BY TRAIL BLAZER = UX171A = CX371A = CX71A = UX-71A = ER71A = ER171A = AC4 = X-171A = 471A = T71A = MX171A = 171A = 171AC = SX171A

71A BALLOON ENVELOPE TRIODE BY TRAIL BLAZER = UX171A = CX371A = CX71A = UX-71A = ER71A = ER171A = AC4 = X-171A = 471A = T71A = MX171A = 171A = 171AC = SX171A

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71A ,BALLOON ENVELOPE, TRIODE, BY, TRAIL BLAZER, UX171A, CX371A,  CX71A, UX-71A,  ER71A ,  ER171A, AC4,  X-171A, 471A,  T71A, MX171A,  171A,  171AC,  SX171A.  Early 1920's, progenitor of the 45 valve, capable of 1W Single Ended and a fine performer, UX4 based.

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