All the above are correct, I would like to add that a lot of noise is can be generated by the power supply. In such power supply there is the infamous capacitors that go weak and tend to 'dry' up, thus allowing the line frquency (X2) to not be filterd out as the designed. Check with Leonard at Audio Research, this preamp is a very quality piece and will give great to excellent results when operating as designed. Hope this helps.
Why is my Audio Research SP6-b noisy?
I have an Audio Research SP6b pre-amp and it is very noisy-has a very loud hiss.I do have it hooked to a very large
pair of altec lansing VOT horn loaded speakers.I have used
4-5 amps and it stills has the hiss.Is this normal?
I know the horns amplify the hiss because when I hooked it
up to my klipsch speakers it was not as noticable.
Any suggestions.I just replaced the tubes.It does it with
the new tubes and old tubes.Go figure.
Anyone else have this problem?
89vett
pair of altec lansing VOT horn loaded speakers.I have used
4-5 amps and it stills has the hiss.Is this normal?
I know the horns amplify the hiss because when I hooked it
up to my klipsch speakers it was not as noticable.
Any suggestions.I just replaced the tubes.It does it with
the new tubes and old tubes.Go figure.
Anyone else have this problem?
89vett