spark1
Lunatic Member
whoops .sorry i missed that part .
So I guess there was user error after all.
whoops .sorry i missed that part .
What was that issue then?
I must have responded before your edit. I don't suppose you had a chance to check the bias before replacing anything?
Just trying to figure out whether this was a pre-existing problem or not.I certainly had the chance, but did not do so. AK is full of admonitions about the risks of faulty bias pots to NSA amps, and the need to replace them preemptively...which is what I did. I saw no reason to check bias beforehand, since I knew I would be starting from zero/near zero with the new pots.
did you disconnect speaker out wires before they go into the broken switch ? and did you check emitter resistors resistance yet ?
OK, here is a new piece of information. I emailed the fellow I got the amp from, who picked it up at an estate sale.
As background - when I bought the amp, he said that it was working, and then showed that to be the case by playing it with an ipod as the source and headphones for output. He also mentioned that he had to replace the larger fuse on the power board when he first got it.
In the email I just got from him, he says that he took it to his friend who does repair work. The friend apparently found the blown fuse, and also told him the bias was "not right" on one channel, but that this was nothing to worry about. I think that's the extent of the history we're going to get (prior to my ownership).