LaChapell Audio 500DT User Manual

Contents

LaChapell Audio 500DT User Manual Manual pdf 5 page image

LACHAPELL AUDIO 500DT 3LACHAPELL AUDIO MODEL 500DTThe LaChapell Audio 500DT is a 500 series microphone preamp that features two separatetopologies or amplification paths. When the blend knob is fully to the TUBE side, the signal willpass through a transformer before being amplified by a TrueTube™ powered 12AX7 vacuum tube.TrueTube is LaChapell Audio’s proprietary method of supplying a full 250V to the vacuum tube soyou get loads of clean tube gain.When the blend knob is turned fully to the OPAMP side, the signal passes directly to a solid statepreamplifier. This input is transformerless and will provide clean gain with exceptionally low noisePlacing the blend control anywhere between the two extremes will “blend” the two topologies for awide variety of tonal options.BEFORE YOU GET STARTEDPlease read the information below before you install and use the LaChapell Audio 500DT.• UNPACKING: Inspect thoroughly. Although we take extreme care at final assembly andpacking, things can happen during transit. It is very important that you contact Digital AudioLabs if there is anything broken or damaged upon receipt of package. Included in everypackage should be: (1) packet of mounting screws, (1) registration card. It is a good idea foryou to retain the packaging (box & foam case) in case there is a need to return the unit forservice or repair at a later date.• SERVICE/REPAIR - WARNING: The user should NOT attempt to service this unit in any way, dueto the risk of electrical shock and the presence of potentially lethal voltages inside the 500DT.It is recommended that tube replacement be performed only when necessary by technicallycompetent individuals.Tube replacement: Turn power supply off and remove 500DT from the chassis, wait fiveminutes to allow the vacuum tube to cool before attempting to remove it. Using yourfingers, apply a slight circular/rotating motion as you pull it away from the socket. It isimportant to replace the tube with the same type. When a replacement tube is installeddouble check that you’ve inserted the correct tubes into the 500DT’s tube socket BEFOREpowering up. WARNING: Warranty may be rendered void if tubes other than thoselisted above have been used at any time.SAFETY PRECAUTIONS• Always provide adequate ventilation by allowing the top vents of your 500 series power supplychassis to remain unobscured. Due to the vacuum tube and the internal secondary power supply,the 500DT will get warm, blocking or defeating any existing vent is not recommended.• Never position the power supply directly above heat generating sources such as a poweramplifier.• Always provide a source to ground (earth.) Never under any conditions should a power cord thathas the third prong for ground missing or defeated be used with the power supply.• Do not place the 500DT in an area where there is a potential for fluids to fall, spill into or comein contact with the 500DT. If you notice fluids or moisture present inside the 500DT DO NOTturn power on! Contact Digital Audio Labs for direction.• The 500DT should only be used with power supply frames that have a >180ma rating per bay.