jea48
Responses from jea48
| 3 preamps with transformer hum, DC on the line? The isolation transformer (a Tripp Lite IS350) did not change anything.Sbrownnw,If you can't send it back, you might try feeding youroppo BDP-93 player from it.Back to your preamp..... What do you have that thing setting on? Would that be working ... | |
| 3 preamps with transformer hum, DC on the line? An isolation transformer will not pass DC voltage. If that were the case the output transformer of a tube amp would not prevent the high B+ DC voltage, that is fed through the primary winding of the xfmr to the plate of the power tube, from passin... | |
| Did I blow my tube amp? One of the youtube video had a Manley Stingray connected to power, no input signal, and NO speakers connected.Not sure why the guy did that......Manual does not say to do it that way. I did the same. After the biasing is done, I connected the spe... | |
| 3 preamps with transformer hum, DC on the line? The power amp consumes 850 watts. Would the one you found be powerful enough for both the preamp and amp?04-05-12: SbrownnwNo...... For a power amp that consumes 850 watts I would not want to use an xfmr rated any smaller than 2.5KVA, 2500Va / wat... | |
| 3 preamps with transformer hum, DC on the line? .... a business park or two down the road and a retail strip mall village at the entrance of the development. 04-05-12: SbrownnwI would think the businesses would have to be fed from the same utility transformer as your house. Down the road they a... | |
| 3 preamps with transformer hum, DC on the line? When you pulled the top cover off the preamp did you notice the power transformer? I assume it is a toroidal. Correct?Have you noticed the mechanical hum being louder or quieter during different times of the day?Try the preamp late at night.... Af... | |
| 3 preamps with transformer hum, DC on the line? DC on an AC power line is highly unlikely unless you live in the third world.04-04-12: Dhl93449Not true. You can easily check this with a DVM. Just set it to DC volts and put it across the line.04-04-12: Dhl93449Not true.Are the transformers overh... | |
| Annoying Hum SOLVED 04-03-12: ChadnlizYou dont need any added filter if you have a correct earth ground, your provider can fix a faulty ground for free.I agree proper grounding is important. And I would urge everyone with CATV to make sure the CATV cable grounding bl... | |
| Tube biasing question please Soniqmike,You want to set the bias voltage per the manufacture's specs of the amp.Here is a good explanation by Herman.05-18-11: Herman"The bias sets the point where the tube idles. When you apply a music signal the amount of current increases and... | |
| Tube biasing question please Soniqmike,Just guessing tubes "A" probably were in the amp a few years and bias was reset a few times.Tubes "B" low hours and probably would test like new.It is a good idea when ever replacing power tubes, that have a fair amount of hours on them,... | |
| Annoying Hum SOLVED Al,It wasn't me back in 2003....Thanks for the kind words.Jim | |
| Ground Cheater plug or.... The hum remains even if the ICs are disconnected from the amp.GrimaceGrimace,I agree with everything Al said.I would add if the sound heard is truly a hum the problem could be a bad electrolytic cap/s in the power supply.An oscilloscope connected ... | |
| Dedicated Line for my home theatre newbie I did watch him install the wire and did notice when he went to hook up the wires to the panels he seemed to remove a lot of the yellow sheilding to allow for the copper ground to be hooked up.The outer yellow jacket is not a shield. It is just an... | |
| Help on Electronic Problem Unfortunately, a gas fitter is usually not equipped or experienced with electrical noise issues affecting audio gear. Really not an electrician's realm either. 03-23-12: NgjockeyAs a rule plumbers do not install fireplaces, a sheet metal worker do... | |
| Dedicated Line for my home theatre newbie I was thinking of Romex 10/2 wire but the electrician is saying that is too big for my panel and he suggests 12/2. Does this sound right?LOL, that's funny, LOL..... Too big for the panel.I would have at least 2 dedicated branch circuit lines insta... |