AUDIO RESEARCH D-76A

Let me suggest you either send it to ARC or to an authorized service facility. Since those are non-standard parts, and the fact that the unit runs at high voltage, I really do think you would be best served by getting it repaired by people who know all about the unit and ARC in particular.

I think the D-76A has a line fuse but not a screen fuse. Do we know if it has the right line fuse in it?

What is the V number of that 12AX7 tube and I will investigate it for you.

Well you could always send it to me as well if you are close to the west coast. Actually, I have refurbished quite a few D-76A's in my time and in fact when the amp is done, it sounds better then new. The reason is, all the filter caps are replaced with non-twist lock caps. The twist locks that came standard with that amp have high ESR (equivalent series resistance) not a good thing for a filter cap to have. Unfortunately, that was all that was available when that amp was manufactured. All the new caps have little adapters so they fit in the circuit board spaces for the twist locks. Also, there are a number of zener diodes used as voltage references, and those tend to drift over time. When the amp is finished, and retubed, it is one awesome sounding amp. Hopefully, one day, ARC will make a commemorative version of that amp as it's truly a classic. I keep pushing them to do it. I think it's time to ask them again. lol

I'm in L.A.

Bifwynne your amp is totally different then the D-76A. I would have to look at the D-76A to see if it's been 'messed' with before I can quote. Also the unit needs to be repaired before anything else can be done to it.

Your not going to get the answers you want talking to Calvin as he is the parts manager. Chris is the tech and he wont be able to really answer you because the unit is not in front of him. I can look and see what the fuse is supposed to be but that still wont solve your issue with the tube and the non standard ARC parts that were installed. It will have to go to someone for repair. You can send it to me or to ARC. Either way you will need a shipping carton if you don't have the original one for that amp. The boxes are not cheap but its the only way that amp will survive it's journey without damage.