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Blown fuse and its soldering to a PCB

I need competent advice:

I purchased a new amplifier (Dared MP-60, made in China). It is cheap and rather good sounding, but its left side got dead (left-side tubes stopped glowing) when I replaced the stock 5881 tubes with RFT EL-34 (everything was OK for 30 min. but next morning, when I was switching it on, the problem appeared), though it was permitted by the user manual and was authorized by the seller.

When I opened the cover, I saw four 125V 8A fuses covered with opaque plastic cases. The fuses have leads soldered to the PCB. We measured them and indeed one was blown.

What is strange that the seller says "you can use unsoldered fuse, but there is no place to place a unsoldered fuse on the PCB". I asked for explanations ("Does it mean that the whole PCB must be changed or that the unsoldered fuse should be replaced by another fuse which should be soldered to the PCB?, and she said "Yes, there is no place to place the unsoldered fuse on the PCB, it means the whole PCB must be changed".

Is this PCB a single-use dummy (if it is possible in principle)? How can it be that the blown fuse must be unsoldered but the new fuse cannot be soldered to the same place in the PCB?
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Showing 1 response by fluxus

fluxus's avatar
fluxus
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Hi,
I have your same amplifier, branded Fatman iTube 252, and just the other day I turned it on and half of the tubes weren't glowing, with one channel being off.

I am using it with some RFT EL34, Melz russian 6sn7-ish, siemens 12ax7.

I suspect it may be your same problem, one of the fuses (or more) being blown.

How did you finally risolve your problem? Do you have any tip to give me? I haven't open my amp yet.

If you even have old pictures you want to share, feel free :))

After you fixed (hopefully) your amp, did it last long without problems, or you did you ran into blown fuses or other issues again?

Thank you!
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