hagtech
Responses from hagtech
| Recommendations for MM Phono ~ Tube or Solid State Don't be fooled by the low cost, my CORNET MM is high performance and plays nicely with SUT because input capacitance is under 10pF. | |
| Suggestions for phono preamp for LOMC's Don't forget to consider my TRUMPET MC. https://positive-feedback.com/reviews/hardware-reviews/hagerman-audio-labs-trumpet-mc-phono-stage/ | |
| Hum mystery to me | |
| Hagerman Piccolo Zero: New transimpedance head amp @rauliruegas My apologies. I thought you were saying cartridge is not pumping out current when used with transimpedance stage. | |
| Higher Impedance MC Carts on Transimpedance Stages? Input impedance of my transimpedance stage is a function of opamp gain. Let's say we have a 100 ohm feedback resistor and an output voltage of 1V. That means input current is 10mA. Forward open loop-gain of opamp in question happens to be 85dB at ... | |
| Hagerman Piccolo Zero: New transimpedance head amp @mulveling - Thank you for the kind words and posting results of your experimentation. I ran the calculations and input impedance of PICCOLO ZERO comes in at about 0.02 ohms at 1kHz. This is purely dependent on the gain/frequency characteristic of... | |
| Higher Impedance MC Carts on Transimpedance Stages? Similarly, the gain you will need from transimpedance stage (assuming it's like an SUT into MM phono) is given by: G = 5R / V; where R is cartridge resistance (plus tonearm wire) and V is cartridge output in mV. For example, an 0.3mV cartridge w... | |
| Higher Impedance MC Carts on Transimpedance Stages? I know it may feel counter-intuitive, but what is happening here is a sacrifice between output amplitude (maximum current) and bandwidth. | |
| Higher Impedance MC Carts on Transimpedance Stages? There is no real contribution from phonostage, since it appears as a dead short, we are talking transimpedance, right? Nevertheless, first order bandwidth rolloff is from L/R ratio of cart (and tonearm wire). Think current, not voltage. | |
| Burn your power cables in PROPERLY with Haglabs Frycorder I like the part where even his wife can hear it. Isn't that the ultimate test? | |
| Higher Impedance MC Carts on Transimpedance Stages? I worked this out. Bandwidth is where current is half of maximum. This occurs when impedance from cart inductance equals cart resistance. If the bandwidth is acceptable, cart will run fine. Bandwidth is given as: f = R/(6.3*L); Or you can use t... | |
| phono stage help please. My Bugle MC might fit the bill? | |
| recommendation for phono pre amp and mc cartridge, around 1000$ each A bit over budget, but my Trumpet MC phonostage will work with any MC cart you end up selecting. | |
| Cable Break In for the Naysayers Good post @ozzy. A lot of the ASR folk state (with apparent absolute authority) that if you can’t measure it, you can’t hear it. I’d like to know approximately which year this started. Was it true a hundred or two hundred years ago? In 1924, we h... | |
| Burn your power cables in PROPERLY with Haglabs Frycorder @agisthos Thank you for the kind words and testimonial. Cable break-in is one of those things you just need to try for yourself. Easy to do, and I offer a 30-day trial period, so you can return device if it does nothing for you. From what I’ve de... |