- Joined
- Oct 19, 2018
- Messages
- 3
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Hi All!
Been reading lots of threads on here lately and the vast amount of info shared by the members is impressive!
I recently acquired a 400 and knowing the limits of my talents decided to take it to get serviced and looked over before even powering it up.
The 400 looks nearly perfect on the outside but knowing the age of it, I exercised some self control and skipped firing it up and giving it a listen.
It's still being serviced/tested but a couple of quick questions I have:
Will or won't a fast blow inline fuse protect speakers if the amp suffers and dumps DC on the outputs?
The 400 manual I found says to fuse the speakers and some folks say it will save your speakers and others say don't bother as the speaker saved the fuse.
I'd like to hook up a pair of easy driving JBL 8 ohm vintage speakers and not worry that the woofer will be smoked. Replacement drivers aren't unobtainable but they aren't what I'd call cheap.
The typical fast blow fuses seems a little slow to react though. I've seen 200% ratings for 120 seconds. Maybe I'm wrong but that 2 minutes probably seems like a lifetime to a driver getting hit with DC.
I don't plan to push the amp/speakers hard so I'm thinking somewhere in the range of a 1.5-2 amp fuse for the content and output I'm looking for.
This pair won't see any 20hz bass drops either. I have other setups for that kind of music.
I found these faster acting fuses and wondered what the members here would have to say
http://www.littelfuse.com/~/media/e...ses/littelfuse_fuse_251_253_datasheet.pdf.pdf
Another question I had, How does a stock 400 (no upgrades) sound with modern pre amps? I have some vintage pre amps that I'd like to A/B compare on the 400 after they're serviced but for now it'll have to be modern stuff.
Long read, but I'd appreciate any thoughts.
Been reading lots of threads on here lately and the vast amount of info shared by the members is impressive!
I recently acquired a 400 and knowing the limits of my talents decided to take it to get serviced and looked over before even powering it up.
The 400 looks nearly perfect on the outside but knowing the age of it, I exercised some self control and skipped firing it up and giving it a listen.
It's still being serviced/tested but a couple of quick questions I have:
Will or won't a fast blow inline fuse protect speakers if the amp suffers and dumps DC on the outputs?
The 400 manual I found says to fuse the speakers and some folks say it will save your speakers and others say don't bother as the speaker saved the fuse.
I'd like to hook up a pair of easy driving JBL 8 ohm vintage speakers and not worry that the woofer will be smoked. Replacement drivers aren't unobtainable but they aren't what I'd call cheap.
The typical fast blow fuses seems a little slow to react though. I've seen 200% ratings for 120 seconds. Maybe I'm wrong but that 2 minutes probably seems like a lifetime to a driver getting hit with DC.
I don't plan to push the amp/speakers hard so I'm thinking somewhere in the range of a 1.5-2 amp fuse for the content and output I'm looking for.
This pair won't see any 20hz bass drops either. I have other setups for that kind of music.
I found these faster acting fuses and wondered what the members here would have to say
http://www.littelfuse.com/~/media/e...ses/littelfuse_fuse_251_253_datasheet.pdf.pdf
Another question I had, How does a stock 400 (no upgrades) sound with modern pre amps? I have some vintage pre amps that I'd like to A/B compare on the 400 after they're serviced but for now it'll have to be modern stuff.
Long read, but I'd appreciate any thoughts.
