thimmy118 Posted September 13, 2017 Share Posted September 13, 2017 I am looking at purchasing some suitable fuses for my Audio Researh VSI75 amp as back ups. On the back of the amp, next to the fuse, it reads: 5A Fuse Slo-blo T4A (230V). I have trying to dechipher this cryptic writing. Which is the correct amperage - 5A or 4A? There are no fuse rated 230v that I can find in Australia and the existing tube has an imprint T4AL 250V. So am I right in saying that I must buy a fuse that has the same inscription? Or rated 4A not 5A. Totally confused. Any advice? Link to comment Share on other sites More sharing options...
rocky500 Posted September 13, 2017 Share Posted September 13, 2017 Just looked online at a pic and it looks like if you on 120V (eg. USA) at the mains then you use 5 Amp. If you are connecting to 230V (Aust) then you use a 4 Amp fuse. Link to comment Share on other sites More sharing options...
thimmy118 Posted September 13, 2017 Author Share Posted September 13, 2017 Makes absolute sense after I had another look at the back of my amp. Thanks Rocky. Link to comment Share on other sites More sharing options...
Addicted to music Posted September 13, 2017 Share Posted September 13, 2017 If it continues to blow a 4A slow blow, it's time to have it checked out! That 4A slow blow should never blow under normal operation as specified by the manufacturer. Link to comment Share on other sites More sharing options...
ray4410 Posted September 14, 2017 Share Posted September 14, 2017 you can purchase 250v 5amp slowblow fuses from rs components online(littelfuses)as recommended by primaluna valve amps,no postage charges and next day delivery have ordered from them several times excellent service. Link to comment Share on other sites More sharing options...
thimmy118 Posted September 14, 2017 Author Share Posted September 14, 2017 I called Synergy Audio Visual today to assist with decrypting the writings on the back of the amp. They confirmed that the amp uses a 5A fuse and the type of fused used is a T4A. Yes, it would be wise to have the amp checked out if the fuse continues to blow, and that was the advice Synergy Audio Visual gave. The slo-blow fuse is supposed to blow if the current exceed 250V continuously and greater than 5 amp or something to that effect. Link to comment Share on other sites More sharing options...
thimmy118 Posted September 14, 2017 Author Share Posted September 14, 2017 Thanks for the tip ray4410. There is another shop call Elements14 which I had a look. They sell Schurter and Littelfuse too. Link to comment Share on other sites More sharing options...
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