gs5556
Responses from gs5556
| I hate to say it, but now I think maybe I like my amp in ultralinear mode versus triode UL mode is a pentode in "partial triode" mode. The screen and plate are operated at the same voltage and when the screen is tapped at the load (plate) it's triode mode and pentode mode when the screen is tapped at the B+ of the transformer. In bet... | |
| Issue with Krell KSA-250 What I would first start to look for: Check for DC at the wall outlet. Check if the transformer cover can be moved by hand, if so then look at the bolts holding down the cover. Remove the cover and see if the rubber or elastomer bushing is still ... | |
| Why tube rectification? Tube rectifiers develop a larger forward voltage drop than silicon rectifiers (up to 50 volts for the tube vs about 2 to 3 volts for the diodes) so that may have quite an effect on the amp as it will change the operating parameters. I would vote N... | |
| Pass Labs XA30.5 Fuse Issue/Question You should play the amplifier through another set of speakers before calling the seller or Pass. Tripping a mains fuse at higher playing volumes makes the Harbeths the prime suspect. | |
| Speaker wire impedance? Speaker impedance? Keep in mind the test leads on the DMM are not resistance-free and the DMM itself has a tolerance at different ohm readings, but usually don’t state or promise any tolerances when measuring below 500 ohms. Measurements in the milliohm ranges shoul... | |
| No More Fake Reviews - So Who’s Gonna Tell Us What To Buy? If a reviewer states that he was given or purchased the product at a discount then to me the manufacturer wrote the review. | |
| Are REL the most Musical Subs? I have a pair of S/510's with Tannoy Autograph Mini's in a near field setup (7 feet away) with the subs far removed from walls and corners. The integration with the Tannoys is perfectly seamless, even following their field of imaging and making th... | |
| DC Offset Issue in Don Sachs Preamp Definitely call Don. But before you do, disconnect all inputs into the preamp and cycle it on and off to rule out the signal source as the problem. Without a schematic it is difficult to guess what the problem is. | |
| Crucial TUBE question Did the tube glow at all? The pin configuration of a rectifier puts no voltage to the KT150 plate and does not complete the heater circuit. In other words a tube with no voltage to glow the base or the top. No glow means no power and therefore a d... | |
| Replacing Capacitors, I Don’t Wanna! I looked at a picture under the hood and I see those blue caps are the Vishay BC 135 series capacitors. Their lifespan is 250,000 hours at a 40C ambient. That's over 28 years if you do the maths. If the temperature inside the case is lower, say 30... | |
| Volume uneven from monoblocks with balanced setting, but not unbalanced. It appears the amplifier has either an open circuit or a short to ground at the XLR inverting (#3) pin. You can check this with a DMM . Place the probes across the #3 and #1 pins. If there is continuity, it's a short. If it's an open circuit (norm... | |
| Intermittent Left Channel Outage-- Older McIntosh System--Love my system appreciate Help! Once you disconnect the speaker cables from the amplifier input of the relay then the relay has nothing to switch. It won't make a difference, but the point here is not to troubleshoot just the relay but also the control circuit from the preamp t... | |
| Intermittent Left Channel Outage-- Older McIntosh System--Love my system appreciate Help! You have to start a process of elimination.... Did you disconnect the speakers from the control relay and connect the speaker cables directly to the amplifier? | |
| Looking for 5AR4 rectifier tube most like solid state The sonic signature of your preamp is mostly the 6SN7 tubes. Voltage sag is not an issue (I think) because those tubes maybe draw 5mA each idle and maybe swing to 10mA on full signal. So the highest plate current is about 80mA for all 8 tubes whic... | |
| Power consuption of an amplifier The transformer is a passive device, it literally passes voltage and current that is fed into it. A higher wattage transformer has thicker wires and is able to carry more current and therefore more power. If the transformer is undersized for the l... |