Just an update on the fuse problem I had with the amp, paid another $120 on a isolation transformer with build in InRush soft start circuit to use it with the Tube Amp, no more blown fuse for 7 days already, two blown fuses already cost more than $120. the gain in sonic difference well worth it.
why do hi-end fuses keep blowing, while std don't?
I've had my McIntosh MC275 for several years running flawlesly. Up until last Nov I was using stock KT88 and rolled small tubes and had a Hi-Fi Tunning fuse without issues.
In Nov-13 I upgraded the KT-88 to Psvane black bottles measuring 60mA plate current. A few power-ons after I rolled the tubes, I turned on the amp to let it warm up, but returned to a blown fuse. I thought a tube might be bad so used a std fuse, but never had a problem again.
Two months ago I bought a new high-end fuse, replaced it, and soon thereafter the same happened: blown fuse. I replaced it with a std fuse again, which is still running.
So I want to upgrade the fuse, but chances are if I use the 2A fuse it will happen again. Yet I don't want to use a higher value fuse. I'm thinking the Psvanes might be drawing significantly more current than the stock KT88 and the Hi-Fi Tunning fuse might have a tighter spec, driving said fuses to fail while the std ones survive. Would you agree?
Suggestions as to how to resolve this?
thanks much!
In Nov-13 I upgraded the KT-88 to Psvane black bottles measuring 60mA plate current. A few power-ons after I rolled the tubes, I turned on the amp to let it warm up, but returned to a blown fuse. I thought a tube might be bad so used a std fuse, but never had a problem again.
Two months ago I bought a new high-end fuse, replaced it, and soon thereafter the same happened: blown fuse. I replaced it with a std fuse again, which is still running.
So I want to upgrade the fuse, but chances are if I use the 2A fuse it will happen again. Yet I don't want to use a higher value fuse. I'm thinking the Psvanes might be drawing significantly more current than the stock KT88 and the Hi-Fi Tunning fuse might have a tighter spec, driving said fuses to fail while the std ones survive. Would you agree?
Suggestions as to how to resolve this?
thanks much!
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- 53 posts total
I bought it from them Tortech,
https://www.tortech.com.au/product-category/isolation/ it is available on ebay.com.au ISO600VA. My tube amp is only 6 months old, manufacturer will no commend on third party hifi fuses and fuse manufacturers will say anything either. After googling few hours Isolation Transformer came up few times and found out Tortech has a soft start circuit to to limit inrush current problem. Actually I turn on the ISO600 before I turn on Tube Amp. |
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- 53 posts total