Mullard Magic: For All Your Vintage Valve and Radio Needs!
71A BALLOON ENVELOPE TRIODE BY TRAIL BLAZER = UX171A = CX371A = CX71A = UX-71A = ER71A = ER171A = AC4 = X-171A = 471A = T71A = MX171A = 171A = 171AC = SX171A