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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.
FRENZEL TUBE AMPS
FRENZEL TUBE AMPSFRENZEL TUBE AMPS
FRENZEL TUBE AMPS
Owners Manual
JF-B45 SBB
“Super Bassman Bluesbreaker”
Guitar Tube Amplifier
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.
FRENZEL JF- B45 SBB "Super Bassman Bluesbreaker"
The FRENZEL JF-B45 "Super Bassman Bluesbreaker" was "INSPIRED" by the two of the greatest amps ever
built...the Fender Bassman 5F6A and the Marshall JTM45 Bluesbreaker.....but it has more power...and a lot more
features.
FEATURES:
Input Jacks isolated from chassis for low noise, eddy currents, and hum.
DC on preamp and driver filaments for low noise and hum.
Star ground system to reduce induced current chassis noise.
Normal and Bright inputs with separate Gain controls . Normal Input voiced for the unique smooth 60's warm tones of
the Fender Bassman or Bright Input voiced for the great Marshall Bluesbreaker high mid tones....or you can use an AB-Y
switch and create your own distinct tones.
Classic 60's style 3-BAND TONE STACK for extended flexibility in shaping your tone.
MASTER level control so you can crank the GAIN's up and overdrive the preamp without overdriving the output tubes.
Classic Type JTM45 Style Presence control .
Unique NNFB "Edge" switch on the PRESENCE control that transforms the power amp section into a No-Negative-
Feedback style amp for more open, less compressed tones.
Class AB fixed biased 6L6's in the output for more power, fantastic headroom....and smooth blues saturation
sounds...or if you like to experiment, you can use KT66's, KT77'S, KT88’s, 5881's, 6550’s or EL34’s for different tones.
No bias adjustment required.
Laser Etched Faceplate
Weight: 35 lbs.
Power Output : 50 watts
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.
Dual Speaker Jacks - Speaker Impedance Selector 4 - 8 - 16 ohms
Dual 5AR4 rectifier's for optimum pick attack and sag...or you can use 5U4’s or Solid State Plug-In for different amounts
of sag.
Extra long (10') three prong grounded power cord.
STANDBY switch to turn off the high voltage during warm-up.
Rock solid point-to-point hand wiring using only the best of parts...low noise tubular polypropylenes caps, metal film
resistors, ceramic sockets, Switchcraft jacks...etc.
Sweet vintage clean to classic overdrive tones with three different types of distortion depending on whether you are
overdriving the preamp, output... or both!
Tube compliment: The amp comes with (3)12AX7, (2) 6L6, (2) 5AR4, but you can substitute 12AT7's or 12AU7's in the
preamp and driver for different tones and overdrive sounds. You can also substitute 5881's, KT66's, KT77’s,KT88's,
6550's, or EL34's in the output stage for different sounds. No bias adjustment required.
FRONT PANEL:
- NORMAL INPUT
- BRIGHT INPUT
- NORMAL GAIN
- BRIGHT GAIN
- BASS
- MIDDLE
- TREBLE
- MASTER
- PRESENCE with NNFB PULL SWITCH
- STANDBY SWITCH
- PILOT LIGHT
- POWER SWITCH
REAR PANEL:
- POWER CORD
- POWER PRIMARY FUSE
- DUAL SPEAKER OUT JACKS
- SPEAKER IMPEDANCE SWITCH 4 - 8 - 16 OHM
User’s Operation Guide:
FRONT PANEL CONTROLS:
NORMAL INPUT – input for NORMAL(Fender) preamp.
BRIGHT INPUT – input for BRIGHT(Marshall) preamp.
NORMAL GAIN – sets the volume and the point at which overdrive distortion is produced by the NORMAL
preamp. Set at ¼ for initial setting.
BRIGHT 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.
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.
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 that a scratchy noise is normal as the Presence control is adjusted. This is caused by the DC
cathode current running through the contacts. It only occurs when the control is adjusted and does 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.
REVERB – adjusts the Reverb level. (Only on amps with the reverb option.)
POWER SWITCH – turns power ON to filaments of tubes. Pilot lamp will light up when switch is turned to ON
(up) position.
STANDBY SWITCH – turns ON high voltage to tubes. Allow tubes to warm up 3- 5 minutes before turning to ON
(up) position. This protects tubes and lengthens tube life. Turn to OFF position (down) when amp temporarily
not in use.
REAR PANEL CONTROLS:
SPEAKER JACKs – connects output of amp to speakers. Jacks are wired in parallel.
IMPEDANCE SELECTOR – selects the output impedance for the speaker to 4 – 8 -16 ohms. Set the switch to
match the impedance of the speaker.
FUSE - protects the power supply. Use a 3 amp SLO-BLO type fuse.
POWER CORD – connects amp to electrical outlet. The power cord is a three prong grounded cord. Always plug
into a grounded outlet to prevent electrical shock. The line voltage is shown over the power cord bushing. Be
sure that the voltage matches your line voltage.
TUBE LAYOUT CHART
=
V3
V2
V1
12AX7 12AX7 12AX7
V4 V5
6L6 6L6
V6 V7
5AR4 5AR4
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