This was one of those reviews where time and circumstances conspired to allow a dual-test. I made the first contacts with Vacuum State, and Allen was eager to oblige. Combine this with a planned trip to Brittany and it was obvious that Geoff too would have a listen to the FVP. Eventually I got tied up rebuilding part of the house we just bought, a
Click here to download the full size of the above Circuit.
nd so the FVP first was sent off to France. These are Geoff`s findings. Note that Geoff used the FVP5A in high-gain mode (I did so in low gain mode), comparing to his own low-gain Audion preamp plus the Dynavector current-mode step-up device. So in case of the VSE pre, Geoff`s resident Dynavector DRT-1 cartridge saw a high 47k impedance, while driving the Dyna/Audion combo it saw the zero Ohms of the current input. Quite a difference. - Werner After having read Allen`s two books, the first on pre-amps, the second on cables, I was intrigued to see what happened when all this was put into practice. And so a month down the line I was presented with a large cardboard box by the deliveryman. Opening it all up revealed a much loved, modified and abused ( ) pre-amp, indeed the one that Allen uses himself to try out new ideas. In effect it was up to full FVP5 spec but the disconnected balance controls and jury rigged phono switch showed how it was a "mule". Cosmetically it looked like a 20 year-old integrated, not a state-of-the-art valve pre-amp, and I even had to remove the top cover as the extra valves would generate too much heat for the `old` slots. BUT I was expecting all this, Allen assured me that under the bonnet it was cutting edge and directly comparable with the production FVP5A. What did surprise me though was the weight. Generally hi-end amps are sold by the pound and here I had something that felt like a budget CD...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
characters left: