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Ampeg SVT -3 Pro Voltage conversion

rupertpeters

Commercial User
Nov 11, 2024
1
0
Hi all i have a customer who has brought in a SVT 3 pro for a valve replacement and voltage conversion which in my younger days used to be quite simple.... valve replacement and service (cleanup) all good but when i changed the configeration to the transformer as discribed in this diagram my Test lamp iec tester (basically a 25watt bulb in series from the mains 240v the lamp shon to its max where it shouldnt, it shou glow dull, meaning a direct short.
now im puzzeld. can any one shed any light as to what i may be doing wrong?
svt expot.PNG
 
What happens when you disconnect the secondaries from the transformer?

There may be other problems in addition to the voltage change.