Kevin Gilmore Dynalo Headphone Amplifier custom made by Felitsa Audio. Balanced inputs only. Felitsa Audio has been known for high quality machine work, but some quality control issues with internal parts. I had a repair person gone over all the parts compared to the Dynalo specifications and the amp has been working perfectly ever since. Class A warm sound with clarity from balanced inputs. VU meter only works when turning up the volume at high levels. Bonus open grate cover optional for extra ventilation. Thank you for looking.

Kevin Gilmore Dynalo Headphone Amplifier custom made by Felitsa Audio. Balanced inputs only. Felitsa Audio has been known for high quality machine work, but some quality control issues with internal parts. I had a repair person gone over all the parts compared to the Dynalo specifications and the amp has been working perfectly ever since. Class A warm sound with clarity from balanced inputs. VU meter only works when turning up the volume at high levels. Bonus open grate cover optional for extra ventilation. Thank you for looking.

Technical Details (copied from Headamp from wayback): I am selling a piece of history :) You are looking at one of the very first commercial creations of Justin of Headamp. This amp, along with Gilmore lite, put Headamp on the map. This amp was the predecessor to Headamp GS-1, which itself was the predecessor to GSX Mini. As shown in the schematic, the open loop gain of the amplifer is about 35. Even with the feedback removed, the THD is less than .01%. That's important because the more linear an amplifier is without feedback, the more the THD, IM and TIM distortions are reduced to unmeasurable levels with feedback added. Stage 1 is a dual FET fully-differential fully-balanced front-end. The idling current is 2mA total per dual FET (1mA per FET) and 4mA for the complete front-end stage which consists of both dual FETs. The dual FETs generate the bias which runs the second stage, and keeps it and the resulting output section in class A at all times. The FETs are ultra low noise dual units specifically designed for audio uses. The total voltage gain of the first stage is 50. Stage 2 is the driver stage. It is a standard class A voltage amplifier - in this case used as a voltage shifter. The voltage gain is 0.5 and the idling current 4.3mA. The push-pull class A output stage is a series of paralleled emitter follower, current buffers. The voltage gain is 0.9 and the current gain is 75. The idling current is 15mA per transistor (or 60mA for the 8 transistors off the +16VDC rail and 60mA for the 8 transistors off the -16VDC rail). The servo circuit is new: most of the servo designs (Mark Levinson and Krell, for example) put the output of the DC servo back into the - leg of the amplifier. I just do not like this. That puts the noise and non-linearities of the opamp inside the audio loop. [The amp's] servo feeds back to the current sources for the dual FETs in stage 1. Like all servos, it is an integrator. Due to the large (relatively) integration capacitor and the 1 meg resistor, the frequency of this filter is 0.05 Hz. With even a decent opamp, the servo's noise is in the tens of microvolts, and does not affect the operation of the current sources significantly. The servo opamp in this amplifier measures the DC at the output, if any, integrates it and applies it to the midpoint of the two LEDs. The LEDs do have a slight change in voltage with respect to current, about 3 or 4%, and that is enough to make the servo work. The ultra-regulation of the power supply shown above is so over the top and unnecessary that most, if not all, people with this amplifier would not even notice the difference. However there are a number of benefits to this design. First it's a dual tracking design. Because the open loop gain of the amp is low, its common mode rejection due to the power supply is not great. However if both the + and - voltage rails move up and down the same amount, there is no bias drift. Because of the pre-regulators, the total line/load variations are under 0.0001%. The fast capactors allow the power supply to react rapidly and in a controlled manner with highly reactive loads like the Grados. The opamp outputs are active in both directions; they can push or pull to keep the power supply at exactly the right point. The power supply design was an attempt to come up with the absolutely best power supply I could. It is even quieter than batteries. Here are a few reviews of the Gilmore V2-SE headphone amplifier: http://www4.head-fi.org/forums/showthread.php?&threadid=40425 http://www4.head-fi.org/forums/showthread.php?&threadid=34487 Topology: Kevin Gilmore Dynalo Volume: 24-step DACT attenuator Input: 3 RCA Output: 2 SE headphone out Gain selection: Yes Pre-amp out: Yes (it has both active and passive pre-amp out. The passive preamp will bypass the amplification circuit; so you are essentially adding a volume control to your source) Loop out: Yes

For sale is an excellent condition HeadAmp Gilmore Lite Mk2. This is the newest revision with upgrade main board. size is tiny but the sound is fantastic. power supply is a linear inline brick that is superior to the original linear PSU. The pre amp out is also great. One of the best headphone amp under 1000$. Can drive almost all headphone at ease with class A amplification. Youll get what you see in the picture. No manual or other accessories will be included. Thank you for watching.

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