john_tracy
Responses from john_tracy
| Cartridge impedance loading question Running a typical MC cart. with a load of 47K is kind of like driving your car without shock absorbers. The inductance of the cart. in combination with the load capacitance forms a resonance circuit. With a 47K load and typical values for inductan... | |
| recommended phono preamp for $2500? Recent review of the K&K Maxed Out | |
| Nottingham Ace Spacedeck Tweaks I tried moving the motor to the front of my Hyperspace. The difference I heard was subtle at best. Slightly more bass definition and more cohesion in the sound stage. Not sure yet if it's enough change to make up for the loss in ergonomics. It doe... | |
| Cary or Conrad Johnson phono preamp? Or the new K&K Trio if the Maxed Out is out of your budget range. | |
| Zany measurements and theories Pressure is force/unit of area. For a phono stylus the force is small but the contact area is very, very small. Result, high pressure.For another example,consider ice skates. Ice occupies more volume that liquid water, hence high pressure lowers t... | |
| diy tube amplifier kit How much output power do you require? | |
| Eliminating hum In reference to amps with a resistor between the circuit ground and chassis ground (usually with a parallel film cap to AC ground the circuit to the chassis), that resistor can be replaced with a inrush thermistor. That way the desired DC impedanc... | |
| Going old school God knows that I am no expert on this subject, but it is my understanding that you will want a mono cart. with a spherical profile stylus and a phono pre that has the many different equalization curves used during the 78rpm era and a good and adju... | |
| Do wooden arms warp You are going to have to make many assumptions to do this calculation. First the heat Q being dumped into the diamond stylus is at the same time being dissipated by the stylus assembly to its surroundings. This will involve the temp. difference be... | |
| Nottingham Ace Spacedeck Tweaks If you do decide to go for a PS unit, instead of the Wave Mechanic I would suggest the new PS from K&K Audio. It will require rewiring of the motor pod but that is relatively simple. This PS supply has separate outputs for each of the two fiel... | |
| LCR phono stages we know about Lewm, the bypass cap is only necessary for the single ended version. The differential LTP version of course does not need a bypass for the cathode CCS as the signal passes from cathode to cathode directly. I have a complete schematic for the beta ... | |
| LCR phono stages we know about You need a cathode bypass cap for the same reason you need one in an ordinary single ended triode circuit. The tube for the sake of analysis can be viewed as an AC signal generator whose output is Eg*u were Eg is the signal voltage presented to th... | |
| LCR phono stages we know about Yes you can have a LTP differential stage with a current source tail and current source plate loads. I have one. The trick is the shunt resistor. It bleeds excess current from the plate load CCS to ground and establishes the plate voltage at the s... | |
| LCR phono stages we know about If you load the input stage cascode with an active current source you can effectively achieve an infinite output impedance. This allows you switch the RIAA series resistor from a series connection to a shunt connection. No issue with RIAA response... | |
| LCR phono stages we know about " is that it places only an inductor in series with the system, which has very low DC resistance compared to the resistor MANDATED in RC type RIAA "My point in posting was to highlight the fact that not all RC RIAA implementations require that hig... |