My VAX4000 (probably 30 years old) went up in a puff of blue smoke. I dismantled it and found the capacitor on the circuit board had pretty much exploded, though I could still read the part no: PME271M. I ordered this one as a replacement and was amazed to find it had very similar markings, in fact it was almost identical - just not exploded ! Fitted it, reassembled and the VAX is now working fine again.