2. amps-preamps
  3. 1301602265

AUDIO RESEARCH D-76A

I am new to this trade so bare with me if I ask dum questions.
I have a AUDIO RESEARCH D-76A power amp that I been using for few months now. as you probably know this amp has the most tubes than any other tube amp that I can remember. the middle of the amp are four 12AX7. I notice that one of the 12AX7 [middle top] are not lighting up nor hot. so I had all the sockets replace but still no light nor hot. I was told that its normal. how could it be? will this de-grade my sound? please enlighten me. I will appreciate any advice. thanks
torogi
hifigeek1
770 posts
 
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.
tbg
5,263 posts
 
Given the age of this amplifier, I would definitely have someone thoroughly check it out. It is not just a matter of the tubes. I had two of these amps in the early 1970s! I am surprised that you have not blown a fuse.
hifigeek1
770 posts
 
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?
tbg
5,263 posts
 
No, nor do we know who told him it didn't matter whether the tubes got hot, nor whether he heard any music, but I guess his using it means that.
torogi OP
6 posts
 
I'm not sure whats the deference between the line fuse in the screen fuse. all I know is that the D-76A has a line fuse. its rated at 6 A 250 V How do we find out weather its the right line fuse? surprisingly it never blew. I will try my third attempt tomorrow to call CALVIN at ARC to ask some of this questions.
More to discover