Frenzel Tube Amplifiers
www.frenzeltubeamps.com
2012 Copyright by Frenzel Tube Amplifiers. All rights reserved. All designs, technical data, pictures, and information are
copyrighted and may not be reproduced without the permission of Frenzel Tube Amplifiers.
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3. POWER ATTENUATOR - Built-in power attenuator provides three power levels. 6 - 12 - 25 watts. Add $75.00
4.VINTAGE STEEL CAGE - steel perforated cage provides protection for tubes and maximum ventilation for long
tube life. Includes "easy to carry" Fender style strap handle. Add $100.00 .
5. 240 VOLT POWER TRANSFORMER - for operation outside the USA. Add $40.00
6. CUSTOM TOLEX HEAD CABS, COMBO CABS AND SPEAKERS - Please see our CABINETS
page for more details.
User’s Operation Guide:
FRONT PANEL CONTROLS:
F INPUT (Normal) – input for Fpreamp.
M INPUT (Bright) – input for M preamp.
F GAIN – sets the volume and the point at which overdrive distortion is produced by the NORMAL preamp. Set at
¼ for initial setting.
M GAIN – sets the volume and the point at which overdrive distortion is produced by the BRIGHT preamp. Set at
¼ for initial setting.
MASTER – sets the maximum volume of the amp and the point at which the output tubes saturate. The higher the
setting on the MASTER, the sooner the output tubes will saturate rate and produce output tube overdrive
distortion. Set at ½ for initial setting. Use the GAIN to adjust the volume level and preamp overdrive. As the GAIN
is increased the preamp will begin to produce preamp overdrive distortion. Turn the MASTER up for output tube
overdrive distortion. By adjusting the settings on the GAIN and MASTER you can set your desired amount
CLEAN and OVERDRIVE tones.
TONE STACK – is a three band Bass, Middle, and Treble tone filter. The controls are interactive in shaping the
tone. You will need to experiment to find the best setting for your playing requirements. Initial settings for all
three controls is the ½ position
BASS – attenuates the Bass frequencies from 10hz – 100hz as it is turned down.
MIDDLE – is a 500 hz notch filter that dampens the middle frequencies. As you turn the control down it deepens
the notch.
TREBLE – attenuates the high frequency tones from 1000hz - 15000hz. As it is turned down, the MIDDLE control
will have less effect.
PRESENCE – – boosts the high frequency range and gives the amp more bright punch. Set at ½ for initial
setting. ( Please Note: a scratchy noise is normal when adjusting the PRESENCE control. This is caused by the
DC current running through the control contacts. It only occurs while adjusting the control and will not affect the
operation of the amp. )
EDGE PULL SWITCH – when pulled out will turn off the negative feedback in the amp which produces a boost in
the volume and a more dynamic less compressed tone.
POWER STANDBY ON SWITCH – In the STANDBY position the power is turned on to filaments of tubes. Pilot
lamp will light up when switch is turned STANDBY position. Allow tubes to warm up 3- 5 minutes before turning
to ON position. This protects tubes and lengthens tube life. Turn to STANDBY position when amp is temporarily
not in use.
REAR PANEL CONTROLS:
EFFECTS LOOP – is a passive insertion point between the preamp and the power amplifier. The SEND jack is the
output of the preamp. The RETURN jack is the input to the power amp. For normal operation these two jacks are
connected together by a push/pull switch on the SEND LEVEL. To use the EFFECTS LOOP, pull the switch out
on theSEND LEVEL control. This will open the loop and allows you to insert an effects unit into the jacks. The
SEND LEVEL controls the output level of the SEND jack and can be used to adjust the level to meet the
