licoricepizza
Responses from licoricepizza
| Shorting Plugs and Non-shorting Plugs - Wothwhile? Disconnecting the preamp, and temporarily relocating is the only thing I haven't tried. I thought I had cured the problem, too, by leaving the preamp on, suggesting that the problem was thermal in nature. But no. One of the things that makes this ... | |
| Shorting Plugs and Non-shorting Plugs - Wothwhile? Actually, no, I haven't listened to the amp alone. I did,however, listen to the preamp alone (with headphones, and everything else unplugged), and I still got the hum. That, for me anyways, rules everything but the preamp. Believe me when I say I'... | |
| Live with A Hum vs. Buy An Outboard Phono Stage Mapman,Actually, I don't need the amp on to play the stereo, I can use headphones! With the amp powered off, and using 'phones, I heard the hum. After about 1.5 hours, the preamp must have warmed up enough to kill the hum, because it did go away. ... | |
| Live with A Hum vs. Buy An Outboard Phono Stage An Update - which I hope is final.The hum doesn't appear to be grounding related. Instead, it appears to be thermal in nature. If I turn off the amp, but leave the preamp powered up, there doesn't seem to a problem. For 2 days in a row now, there'... | |
| Live with A Hum vs. Buy An Outboard Phono Stage After looking at the website, I'm wondering if I can anything like that at Home Depot, or Lowes. | |
| Live with A Hum vs. Buy An Outboard Phono Stage The only moving of the preamp has been to move it to a separate shelf by itself (no discernible difference). When I connected different amp, they were about 3' apart. No difference then either.This morning, I put a metal widow screen behind the st... | |
| Live with A Hum vs. Buy An Outboard Phono Stage When I separated the amp and preamp (twice now), they are currently separated by a shelf, and a CD player. They used to be right on top of one another. The 1st time was when I tried to eliminate the amp by connecting my old Carver M-500T. It buzze... | |
| Live with A Hum vs. Buy An Outboard Phono Stage Newbee,I shorted the ICs by jamming a piece of tinfoil into a cheapo pair of ICs (very high tech), and then putting that IC into the phono inputs of the preamp, which is a NAD 1155, which is solid state. I'd like to go tubes, but I can't afford it... | |
| Live with A Hum vs. Buy An Outboard Phono Stage I thought that the problem may be thermal, that's why it lessens to a degree when the preamp/combo are left on for a while. Now, I have the preamp on a separate shelf. The amp can no longer provide a measure of heat. Maybe a heating pad on the pre... | |
| Live with A Hum vs. Buy An Outboard Phono Stage Newbee,The phono input even hums when no phono is even there. After seeing that, I tried the shorted interconnects. When I got no hum then, I proved that the preamp wasn't at fault. I haven't been able to identify an extraneous source, so I wrestl... | |
| Measuring A Capacitor An update - This morning, the hum had returned, so I retraced my doings of the day. It turns out that the cause of the hum wasn't plug orientation, like I first thought. But rather, it was airborne RF interference caused by my amp. As long as ther... | |
| Measuring A Capacitor The hum is finally gone! The ultimate fix was a simple one. All I had to do was flip the preamp plug 180 degrees. I thought I had already done that. Live, and learn I guess. Now I have about 5,000 LPs that are waiting to get played... You all know... | |
| Measuring A Capacitor Here's what I did: I used shorted RCA cables on the phono input - no discernible hum. Then I used tin foil (as a shield) between the phono cable and the power amp power cable - hum still present. Then I went wild with the tin foil, and put a few 2... | |
| Measuring A Capacitor OK, I did the shorted IC exercise, and there was no hum. What does that tell me? | |
| Measuring A Capacitor The buzzing noise is at 60Hz (my guess), and is pretty loud (volume dependent). I know it's there, so I get bothered by it's presence. |