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3 amp Slow Blow is according to the operation manual p.4 : « LINE FUSE The Fifty/Fifty is protected by a 3 amp fuse when operating on 100 - 120 V. AC. Should the fuse blow, replace it with a Slo-Blo fuse of the same amperage. » Here’s tests I have done so far, no input, volume ctrl at 0 ...

Do I have to do these tests in Standby mode or do I have to pass from standby to ON with a load box in each channel output ? The test I have done previously with all the tubes removed was only in standby mode, never pass in all operation for this test, should I also redo it by running in full...

Hi Dom Thanks for the safety advise ! I will refresh my procedure, it’s been a couple years since I opened a tube amp. Yes the amp power up (in standby) with all its tubes removed (power and preamp) Visually everything seems to be fine inside. (See picture)

Hi I’m new in the forum, I’m a owner of several Mesa amps and I’m very proud to be part of this community. However I have an issue with one of my pride and joy amp, the Fifty Fifty stereo rack that I use for Wet-Dry-Wet setup. Last week the fuse blowed and then I change it (3 amp Slow Blow)...