Avoid drilling extra holes and making changes to the chassis and pcbs by all means. This will decrease the value of your amp since you will not be able to restore it to the original state anymore. Make sure to take pictures of the original state of the amp, so you are able to restore the amp back to a working state. In the Ampage threads and at
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the PlexiPalace BBS I found some people recommending to bias Oranges at 32-34 mA. Amperex recommends about 35 Ma`s per tube, but 30-33 if your plate voltage is over 560V. Frequently occurring in the US: the PT is not suited for todays Mains voltages. That is why the tubes get plate voltages that are way too high. The amp doesn`t operate at the voltages it was meant to. This may cause early wearing out of tubes. There is also some arcing risk in Oranges which is certainly not improved by these higher voltages. Solution No standby switch on vintage versions: since Oranges use SS rectifiers this is certainly one of their weak points. Some people insist on adding a standby switch, others say it`s part of the vintage charm not to have it. Fuses blowing in the US: the voltage ratings on the back of the amps are for UK mains voltages (220-240Volts). Evidently the power consumption of the amp is the same no matter on what mains voltage it is running. Since power consumption equals mains voltage times drawn current, fuses in the US have to be rated higher than in the UK. 2. Orange also sells the AD140 PTs as replacements for the 120s; they are a bit larger but are offered by Orange as excellent replacements for the 120W OTs. 3. Axiom Transformers/Mercury Magnetics sells replacement transformers fro Orange amps and also rewinds original transformers. Check the size of the Axiom/Mercury transformers, they are said to quite large. 4....
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.....
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