hifi engine

Amber Series 70 Pre Amp and Power Amp

Does anyone have a manual for this pre amp that I bought in the early 80s? I think it's a series 70 but I don't see that on the amp itself. I bought it at the same time I bought the Amber series 70 power amp, so I'm just assuming it's also a series 70 pre amp. The fuse on the pre amp broke and I'm not sure what to replace it with. The writing on the broken fuse looks like Bussman AGD 1/4 but it's hard to see. Not sure where I can buy a replacement fuse.



Re: Amber Series 70 Pre Amp and Power Amp

I don't think Buss ever made an AGD series fuse. What is the length of the fuse? The 1/4 would mean the amperage; whether it's slow blow or fast blow would not be that important.

Re: Amber Series 70 Pre Amp and Power Amp

I checked more closely. Actually, it's AGC 1/4 amp. It looks to be ! 1/4" by 1/4".

Re: Amber Series 70 Pre Amp and Power Amp

AGC would be 1.25 inches long; standard fast blow. This is a common fuse; if you can't find them locally then eBay should have them.

Re: Amber Series 70 Pre Amp and Power Amp

I've purchased a new fuse but can't insert it into the fuse holder. The base of the broken fuse is stuck in the fuse holder and I can't get it out. Similar to the base of a light bulb staying stuck in the light bulb holder after the bulb breaks. Anyone know how I can get the base from the broken fuse out? Tweezers haven't worked. Appreciate any good ideas.

Re: Amber Series 70 Pre Amp and Power Amp

Needle nose pliers maybe. The metal used in fuses is fairly thin; you can get a small screwdriver and bend down one side then grab it.

Re: Amber Series 70 Pre Amp and Power Amp

Thanks. Tried pliers, tweezers and tiny screwdriver, and nothing seems to work. May have to buy a new fuse cap somewhere.

Re: Amber Series 70 Pre Amp and Power Amp

For removing stuck glass fuse end-caps in barrel type holders , I use a self-tapping machine screw. The blunt, tapered end fits inside the cap such that threading into the metal twists the cap inside holder. This usually breaks loose even the most stubborn units and does not damage fuse holder. Rarely is much force needed, though using screwdriver or pliers on the screw is acceptable to obtain better grip on the surfaces. When installing new fuse, I use some dielectric grease to assure sticking problem does not recur.

Re: Amber Series 70 Pre Amp and Power Amp

It worked! Great suggestion.Thanks.

Re: Amber Series 70 Pre Amp and Power Amp

Thanks! I am going to try this.

Re: Amber Series 70 Pre Amp and Power Amp

Thanks!