ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
I recently purchased a pair of pentas (1's). They were demonstrated as working by the seller, I carefully loaded them and bought them home - a journey of 150 miles.
After setting them up I connected them to a Beogram 9000 - via RCA from pre-amp out as I don't have a Speakerlink cable. One speaker is working perfectly, the other is hissing like a snake. This starts immediately on start up and continues for a number of seconds after switch off. I've switched the wires round = same thing. I have also disconnected altogether and the hiss is exactly the same, suggesting to me that there is a problem is the amp itself.
I don't really want to tackle a complete recap at present as I really want to get these in place and get a feel for the physicality of them. In the longer run I am happy to tackle a more significant rebuild but a repair would be acceptable for now.
I am looking for any suggestions as to where to start. I have downloaded the manual, and would guess the power circuit to be likely. Any pointers gratefully received.
My first post!
Kneale
You wrote they were demonstrated as working before you transported them home. Did the seller also use the RCA input when he demonstrated them? Have you tried the amp-level input? Maybe a loose connection got broken in transport? Or you have a bad RCA connector? I'm not an expert, but seeing that they were working before transport, I doubt that a bad capacitor would be the cause of the hissing problem.
Thanks Brian. They were demonstrated using an amp level input. I also wondered about a loose connection from transport.
Having explored a little more the problem is intermittent. But even when "quiet" there is a subtle hiss from the speaker. Cynically with an intermittent problem I wondered whether he just hit luck with the demo! He was very B&O knowledgeable and truth is I doubt this.
I thought it unlikely to be the RCA connector because of the fact that the hiss is there even when no connection, and that it continues for a number of seconds when the speaker is switched off. It fluctuates when it is present. I don't have an easy way of testing amp level input - unless you have suggestions as to how to do that using the beocenter 9000?
Again - many thanks for any advice. Next plan (probably tomorrow depending upon work) is to dismantle and begin to explore.
kneale