Phaedrus Audio PHAB User Manual Download

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User Manual for

PHAB - tube microphone preamp'

PHAME - tube instrument preamp'

PHI - tube DI box

This manual is also available as a pdf download, Go to:

www.phaedrus-audio.com

Summary of Contents for PHAB

Page 1: ...Ph drus Audio Ltd 2011 All rights reserved User Manual for PHAB tube microphone preamp PHAME tube instrument preamp PHI tube DI box This manual is also available as a pdf download Go to www phaedrus a...

Page 2: ...oduce the quality and character of classic equipment but in a modern highly reliable and cost effective way Chapter 1 Background The Ph drus Audio PHAB PHAME and PHI products came about because two re...

Page 3: ...ned from the common source of Mullard s reference audio designs and thereby sharing a common heritage with the REDD amplifiers was developed We called this amplifier the Phaedrus PHILHARMONIC literall...

Page 4: ...oduct designed for a wide range of applications from live use to the recording studio Partnered with the PHAB it provides a solution for almost any instrumental or vocal preamp application Constructio...

Page 5: ...ww phaedrus audio com or by contacting sales phaedrus audio com Ph drus Audio Ltd warrants that the equipment it manufactures shall be free from defects in material and workmanship for a period of one...

Page 6: ...e above by a further year A mise jour service includes a complete inspection re valve re tube and the implementation of any engineering updates as well as a re test to performance specification If ext...

Page 7: ...The PHAB and PHAME preamplifiers and the PHI DI Box should NEVER be connected to the external power supply or in any other way energised when the case is opened and or the circuit board is accessible...

Page 8: ...nstalled in Ph drus Audio s products during assembly are selected to give the best possible performance We offer versions of all products with NOS rather than current production valves But these must...

Page 9: ...ed That said the lifetime of a valve tube is largely determined by the lifetime of its cathode emission and the small signal valves tubes used in the PHAB PHAME and PHI use oxide cathodes which can pr...

Page 10: ...olely designed with sound quality in mind can transform the quality of your recorded signals That is the aim of the Ph drus Audio PHAB tube microphone preamplifier to offer just such a no compromise m...

Page 11: ...itry the pass band of the Ph drus Audio PHAB preamplifier is extended in both the bass and extra high frequency ranges Due to this unwanted very low frequencies due to traffic or air conditioning rumb...

Page 12: ...that there are so many plug in effects and amplifier emulations which run as software on the computer host All that is required when working this way is to get a natural signal into the computer s an...

Page 13: ...and therefore greater inductance sound considerably more chunky or fatter than standard pick ups It s the major reason why cables really do sound different fatter cables because of their lower capaci...

Page 14: ...create a ground loop in a correctly wired studio However connection to an earthed or grounded guitar amplifier can cause a circulating current should pin 1 of the output XLR be earthed grounded elsew...

Page 15: ...equipment aligned to EBU EBU R64 1992 standard and 14dBFS on equipment aligned to SMPTE RP155 as illustrated On a broadcast standard PPM peaks should be set to read 6 on the BBC scale or 8 on the Eur...

Page 16: ...rument with the very high input impedance such as it sees when plugged into a valve amp see Voicing and the valve amplifier section above This is the role of the Ph drus Audio PHI DI Box The dual valv...

Page 17: ...ul to be able to DI not the output from the instrument but the signal which drives the loudspeaker This signal is not modified by the cabinet but it does have at least the character of the amplifier i...

Page 18: ...result is a fizzy over bright signal very different from that heard from the loudspeaker The reason for this is that the loudspeaker and cabinet act together to form an asymmetrical band pass filter...

Page 19: ...be very susceptible to electrostatically induced mains interference The tell tale signs here are a high level audio buzz rather than a hum on the output signal and the phenomenon that the instrument p...

Page 20: ...stic is particularly valuable in ensuring a low impedance drive to the output transformer The output stage directly feeds the output step down transformer The output is balanced and earth free A modes...

Page 21: ...y low current and is biased by a separately derived bias supply This ensures a high and consistent input impedance The second stage is DC coupled to the first and runs in a higher quiescent current co...

Page 22: ...40Hz 4VU 0dBu gain 40dB Noise 120dB referred to input Power supply 12V AC Power consumption 8 Watts Phantom Supply 48V DC up to 5mA PHAME Specification Circuit configuration 3 valve vacuum tube design...

Page 23: ...s being declared The manufacturer hereby declares that the products identified above comply with the protection requirements of the EMC directive and with the principal elements of the safety objectiv...

Page 24: ...n test Pass Fail Distortion test Pass Fail PAD test Pass Fail Frequency response test HF 3dB extension Pass Fail Frequency response test LF 3dB extension Pass Fail Phantom 48 supply test Pass Fail N A...