PHAEDRUS AUDIO RS124 Phamulus Tube Compressor Mu Based Delta Emi

( Brand: Phaedrus Audio ), ( Model: PHAMULUS ), ( Type: Dynamic Range Processor ), ( Effect/enhancement: Compression/limiting ), ( Form Factor: Modular ), ( Number Of Channels: 1 ), ( Connectivity: Xlr In ), ( Features: Active ), ( Country/region Of Manufacture: United Kingdom )

Review PHAEDRUS AUDIO Phamulus Tube Compressor. Mu Based Delta Emi

The Phamulus Tube Compressor Phaedrus RS124, developed by Delta Audio and based on the classic EMI RS124 design, is a stunning piece of audio equipment that promises to elevate your recording and mixing sessions to new heights. This compressor is a faithful recreation of the legendary EMI RS124, a British-made device that gained renown for its distinctive sound and versatility in the 1960s and 1970s.

The Phamulus Tube Compressor Phaedrus RS124 features a hand-wired circuit, using high-quality components and vintage-style tubes to deliver an authentic sound that is rich, warm, and full-bodied. The unit comes equipped with a true RIAA EQ circuit, which provides a gentle high-frequency boost, contributing to the characteristic "British sound" that the EMI RS124 is famous for.

The compressor offers a variety of control options, including a ratio knob that allows you to adjust the amount of compression, from subtle leveling to aggressive squashing. The attack and release controls give you the flexibility to shape the timing of the compression, ensuring that your audio maintains its natural dynamics while still benefiting from the compression effect.

The Phamulus Tube Compressor Phaedrus RS124 also features a sidechain high-pass filter, allowing you to exclude low frequencies from the compression process. This can be particularly useful when dealing with bass-heavy sources, helping to prevent unwanted pumping or distortion.

The unit's output level control allows you to set the final output level of your compressed signal, while the bypass switch lets you easily compare the compressed and uncompressed versions of your audio. The Phamulus Tube Compressor Phaedrus RS124 is housed in a sturdy, metal chassis with a retro-inspired design, complete with a VU meter to provide visual feedback on the compression activity.

In summary, the Phamulus Tube Compressor Phaedrus RS124 is a high-quality, faithfully-recreated vintage compressor that offers a unique and characterful sound. Its versatile control options, coupled with its high-quality construction and components, make it an invaluable tool for any recording or mixing engineer seeking to add warmth, depth, and punch to their audio.

1. High-quality tube components: The Phaedrus RS124 uses high-quality tubes, which can provide a warm, rich sound with a natural feel.

2. Versatility: This compressor can be used for various applications, including vocals, drums, guitars, and bass. It also has a range of ratios and attack/release times, allowing for a wide range of compression styles.

3. Analog sound: The Phaedrus RS124 provides an analog sound that can add character and depth to your tracks, making them stand out in mixes.

4. Durable construction: The unit has a solid build and is designed to last for a long time.

1. Expensive: This compressor is a premium product and comes with a premium price tag.

2. Limited control options: While it has a range of ratios and attack/release times, the Phaedrus RS124 does not have a wide range of additional control options, such as sidechain filtering or external sidechain input.

3. Maintenance required: Tube-based compressors require regular maintenance to ensure they continue to perform at their best.

The Phamulus Tube Compressor Phaedrus RS124 is a high-quality compressor that can provide a warm, rich sound with a natural feel. It is versatile and can be used for various applications, making it a great option for professional studios and audio engineers. However, it is expensive and does not have a wide range of additional control options. If you are looking for a premium compressor and are willing to invest in the maintenance required, the Phaedrus RS124 is a great option. If you are on a budget or need more control options, you may want to consider alternative compressors.

If you are looking for a high-quality tube compressor and have the budget for it, the Phamulus Tube Compressor Phaedrus RS124 by Delta Audio EMI is a great option. It can provide a warm, rich sound with a natural feel and is versatile enough to be used for various applications. However, if you are on a budget or need more control options, you may want to consider alternative compressors.

Details:

Just like the RS124, this compressor would not be the first choice for vocals. In a radio set, the radio wave strength may vary due to reflections, obstacles this being especially true for mobile radios in cars and airplanes. Fortunately, newer magnetic materials meant a match to Alec specifications very closely in a smaller package. By arranging the RF carrier to work only over a proportion of the overall characteristic and sliding the incoming signal over the entire operating characteristic, it is possible with any valve to derive a measure of variable gain, as illustrated below.

Alternatively, with the switch depressed, the threshold preset control may be adjusted for greater flexibility. Compressors, limiters and limiting amplifiers compressors and limiters enjoy a fundamental similarity.

It is a modular, rack mount London series the circuit design of the ph drus Audio Phamulus is based upon this circuit. The essence of the Alec 436 circuit upon which the ph drus Audio Phamulus is based emi RS124 a famous, but rare, emi developed variant of the Alec Lansing 436 exists which included a modification to the input circuit to include a matched impedance attenuate and added an output attenuate both designed to operate at emi's quaint, 200 ohm interface standard.

This is illustrated here. The user operation of this equipment therefore largely relies on how hard the equipment is driven to alter the dynamic range of the incoming signal. The much vaulted emi RS124 at heart, a modified Alec emi's variable release user control has been adopted in the design of the ph drus Audio Phamulus such that the control allows for adjustable release times between.

The Phamulus is a delta mu tube compressor inspired by the Alec it can work and it's certainly a pleasure to drive. This action is damped by the time constant formed by r9, p2 and c4 which allows for some adjustment of the compressor's release time. It also incorporates the emi output attenuate essential in a modern studio because the Alec's output is so hot. However in older tube based units, such as the equipment the ph drus Audio Phamulus is based upon, these functions are combined in a gradual characteristic.

Var mu compressors the Alec Lansing 436 and the emi RS124 the most famous classic tube based compressors are of the var mu family in which advantage is taken of technology developed for automatic gain control AFC for radio equipment. All valves tubes have a power law transfer characteristic. Output attenuate one criticism often leveled at the Alec 436 is that its output level is very hot making it difficult to interface with other equipment.

The compression control signal itself remains inaudible because it is applied equally to both input valves whereas the music signal is applied differential in other words, the common mode control signal is cancelled out in the differential amplifier. The compressor characteristics as shipped are illustrated in the figure below. In this circumstance, the filtered AFC control voltage taken after the detector is large and this is so arranged to slide the input signal to the left hand portion of the curve in the figure above. The solution to the problem came in the shape of a post detector, filter circuit with a time constant long enough that it removed all the Audio modulation and left just an overall dc voltage value dependent on the average amplitude of the RF carrier.

In a limiter, the knee of the compression curve the threshold is set way up the transfer function, after which a very high degree of compression is imparted on the input signal. But its real forte is on guitars for which emi always used it. Audio valves are sharp cut off types which means that the VG IA characteristic is made as linear as possible.

Entirely based on the emi RS124. If the signal level drops, initially, the volume of the signal drops too. This is a valid criticism and the emi engineers wisely added an output attenuate to the Alec chassis for the RS124. Except as the basis for compressors.

So important was this development in radio sets, that radio valves are especially designed to maximise the curvature of the transfer characteristic, these types of vales being known as var mu valves the mu relating to the coefficient of gain. How was the variable gain accomplished the answer lies in the inherent non linearity of the valve tube which is deliberately exploited in radio valves to offer the AFC function. The circuitry is identical, although the transformers are custom designed in allow it to fit into the chassis module.

Suppose that for the moment the radio set is receiving a strong signal. With amplitude modulation am radio, this is problematic, because a change in the signal strength causes a change in detected output and thereby reproduced volume and this is very disturbing to the listener.

The ph drus Audio Phamulus is based upon the classic design of the Alec Lansing 436c compression amplifier. But, in a fraction of a second the usual control delay is about 1/4 of a second, the AFC control voltage falls and biases the operating range of the valve to the right of the characteristic, thereby restoring the RF level, and with it, the recovered Audio. This was a major problem with early wireless sets and a solution was eagerly researched. By applying low level drive by means of reducing the drive via the input attenuate this equipment will only impart a gentle compression characteristic.

That is to say that a given change in grid voltage does not result in an equal change in anode current over the operating range of the valve. All ph drus Audio products are hand built in the UK the entire unit was retro fitted with an emi designed escutcheon which disguised its Alec heritage.

This is one of the reasons why radio valves make poor devices for Audio applications. The circuit works like this large negative signal peaks on the anodes of the push pull output stage v2 cause double diode v3 to conduct and drag down the bias volts to the input stage v1.

The only difference between a volume compressor and an AFC circuit is that in the case of the former it is the Audio signal itself which is rectified and used as the control signal, rather than the modulated carrier. Most modern compressors provide controls to adjust both compression threshold and ratio, so it is logical to speak of these units as compressor limiters because they can function as either. The Phamulus also incorporates a controlled impedance attenuate at a fixed 10db attenuation, delectable by a front panel push switch. The level threshold, at which the compression action is required, is adjustable too by means of the simple expedient of biasing the cathodes of the double diode v3 with a constant bias derived from the slider of p3.

The alternative to remote cut off valve is a sharp cut off device. The compression action is obtained because, as signal peaks depress the bias volts on v1, the stage slides further down the input valve's curved VG k IA characteristic the required voltage change for a given change in anode current is reduced and the stage gain is lowered. The Phamulus has all the modifications to the Alec 436 that were incorporated in the RS124, including most importantly, from an artistic point of view, a variable release time user control recovery in emi speak. The Phamulus front panel note that the ph drus Audio Phamulus also features a front panel push switch which enables quick selection between a factory set threshold level compressor position, and a variable threshold level via the right hand preset, labelled limiter position.

This signal was then used to adjust the gain of the radio frequency or intermediate frequency amplifiers prior to detection. Alec Lansing 436c the Alec Lansing 436c compressor amplifier above dates from the nineteen sixties. 1 sec much faster than the original Alec and In a compressor, a lower degree of compression ratio is imparted at a lower threshold.

Another term for var mu is remote cut off which describes the fact that the cut off point for the valve the negative voltage at which the anode current ceases, is made as remote as possible from 0v, thereby prolonging the curvature of the VG IA characteristic. The dynamic response of the Phamulus is illustrated in the below. Adjusting the threshold preset gives a family of characteristics between these two extremes. This greatly increased the scope of the compressor's duties beyond what the original Alec could do and to which has been attributed some Beatles' magic.

Ph drus Audio is a boutique manufacturer of hand build and custom, tube and discrete solid state equipment inspired from British designs of the nineteen sixties.

specifications signalprocessorgo:

• brand: Phaedrus Audio
• model: Phamulus
• type: Dynamic Range Processor
• effect/enhancement: Compression/limiting
• form factor: Modular
• number of channels: 1
• connectivity: Xlr In
• features: Active
• country/region of manufacture: United Kingdom

Ratings:

1. Perfect! Peanut Butter & Jelly right! 03-06-15
2. Fast delivery, works great, thanks you very much. 02-20-15
3. Fast shipping! 02-27-15
4. Very Nice Thank you 02-12-15
5. Fast shipping, carefully packaged. Would buy again. 02-23-15

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• condition: New
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