Eden Valvetech VT-300A User manual

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Valvetech VT-300A
All Tube Bass Guitar Amplifier
Users Manual
EDEN
The Standard in BassSound
Draft Copy: 1-20-2000

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Congratulations on your purchase of this unique all tube amplifier. The VT-
300 was designed for those who love the great vintage tone and gentle
acoustic color of the old tube amplifiers. This is a hand crafted amplifier
built with modern construction techniques and reliable printed circuits by
people who care about sound and quality.
Thank you for choosing Eden. Please take the time to read this manual and
to send in your warranty card.
CAUTION
To reduce the risk of electrical shock, do not expose this unit to rain or
moisture. Do not defeat the ground or polarization of the power plug. Do not
operate the unit near sources of excessive heat. Do not obstruct the
ventilation openings.
Your ears are your most important piece of equipment. Unfortunately, they
cannot be replaced as easily as your other gear. Please take the following
warning seriously.
This product, when used in conjunction with a sound source and
loudspeakers or headphones, may be capable of producing sound levels that
could cause permanent hearing loss. DO NOT operate at high volume levels
or at a level that is uncomfortable. DO NOT place your ears next to the
speakers. If you experience any discomfort or ringing in the ears or suspect
hearing loss, you should consult a health care professional.
Please complete for your records
Date of purchase:______________________
Model:______________________________
Serial Number:________________________
Dealer:______________________________

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Front Panel Features
Input Jacks
Designed to accept a standard ¼” mono phone plug. The Passive jack is for
use with low output Basses and passive Basses. The active jack is for higher
output Basses with active electronics.
Overdrive Control
This switch shifts the amplifier into an ultra hi gain mode, suitable for a
wide range of sound textures from clean to fat and all the way to saturated.
With exact control through out the entire range. This works in conjunction
with the gain control. The higher the gain control is set the more distortion
can be generated. This function is also on the foot switch.
Gain Control
This sets the channel gain for the system and lets you match the output level
of your instrument to the amplifier. In the overload mode the gain control
setting determines the amount of overload available.
Multi Q Equalizer
The Multi Q Equalizer circuit uses a four band parametric E.Q.. It has preset
centers, and fixed Qs or bandwidths that vary with center frequency. This is
a very user friendly set up. You can tune in your sound in very quickly
using this simple system. The center frequency spacing follows the natural
content of the music and fits with the instrument very well.
Master Tone Controls
The Master Bass and Treble controls are provided for very fast E.Q. of the
system. They also combine with the Multi Q for even more tone shading.
These are Hi Fi type shelving filters and effect a broad range of tone.

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Master Level Control
This controls the final drive to the amplifier. Use this to control your stage
level. About mid point on the control should be normal for most playing
situations.
Compressor Active light
This indicates the activity of the compressor. When the LED lights up the
compressor is functioning.
Compressor/Limiter On/Off switch
This is located on the back panel of the original series and on the foot switch
in the (A) series currently in production.
This turns the Compressor limiter on and off to he final output stage of the
amplifier.
Damping Selector
This unique feature is on the foot switch of the current (A) model. It allows
the amplifier to be very flexible. In the low setting you get normal vacuum
tube damping response. That is an open round soft low end that works well
with 4 string Basses and traditional tones. In the hi position you get a tighter
more defined sound suitable for slapping and more modern playing styles.
Standby
This switch sets the amplifier in the standby mode. The filaments stay
powered up but the hi voltage to the output tubes is removed so that they can
not operate. This extends the life of the tube and allows for less stress during
start up and power down.
Mains On/Off
This turns the main power to the amplifier on and off.

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Back Panel Features
AC Power Inlet
This is the main AC connection point. It is an IEC type inlet and also serves
as the fuse carrier. Replace the fuse only with the same type and size as the
original.
FX Loop
This loop is located post the tone controls and sit just prior to the amplifier
input.
Tuner Output
This provides a full time output for connection to a tuner.
Direct Recording Output
The direct recording output is fully balanced and has the ground lifted as the
standard configuration. It is configured for both pre and post tone with the
provided switch. The output level can be adjusted with the level control
positioned next to the pre/post switch.
Speaker Impedance Selector
This switch should be selected to match the impedance of the enclosure.
Note: This should be done with the Amplifier turned off.
Speaker Output Connectors
Connect the loudspeaker here. Connect the speaker before turning on the
amplifier. Do not disconnect the speaker while the power is on.

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Cooling System
This unit uses a continuous flow cooling system that is always in operation
when the power is on to the amplifier.
Output Tubes
Your unit comes from the factory set up and fully run in for 6550 type
output tubes. Optional EL-34 outputs can also be fitted to your unit. This
requires that the bias be reset to match the selected tube type. Replacement
tubes that match your output tubes are available from the factory. Look up
the number on you output tubes and ask- for the same code number. You can
generally replace on or two numerically matched tubes without re-biasing
the amplifier. A full replacement set should always be re-biased by a
qualified technician. Good quality matched output tubes will have better
output power and longer service life than a poorly matched set will have.
Service
If you have a question about the operation of your unit, or a service problem
with your unit please call us at the factory () or at technical support (847-
949-0444) and we will be happy to help you.
Your unit has a two year warranty with the exception of the tubes. The tubes
are warranted for 90 days from date of purchase.
Eden Electronics Inc.
P. O. Box 338
310 first St.
Montrose, MN 55363
612-675-3650
612-675-3651 fax
[e-mail]
http://www.eden-electronics.com