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Guitar Version

Dual Channel, Four Inputs

Class A/B Design, 40-Watts RMS Output

1-12AY7, 2-12AX7, 2-6L6GC's, 1-GZ34, 4 - 10" Combo or 2 - 10" Combo

Jensen P12Q Alnico Speakers.


Special Edition Price:   $1,599.00 (Vintage voiced for Guitar with four Jensen C10Q speakers), or


$1,895.00 Alnico (Vintage voiced for Guitar with four Jensen P10Q's), or


$2,495.00 (Alnico BlackBirds rated at 100watts each for extreme clean headroom)




Bass Version

Dual Channel, Four Inputs

Class A/B Design, 50-Watts RMS Output

1-12AY7, 2-12AX7, 2-6L6GC's, 1-Solid State Rectifier/Copper Cap, 4 - 10" Combo or 2 - 10" Combo

 Four - Jensen Bass "Punch" Ceramic Speakers


Special Edition Price:   $1,995.00 (Voiced for BASS with four JENSEN "Punch" Bass Speakers)




Our 5F6A TWEED BASSMAN is based upon the original 1959, Bassman® 5F6A amplifier.  Many say that this amp design is where it all started and where it all ended!  The 5F6A is by far, the most famous tube amplifier of all time.  This is the same amp with superimposed modifications that Jim Marshall incorporated into the JTM45, Bluesbreaker and Plexi amps.   

The 5F6A employs a Cathode Follower circuit design for the least possible hum in a tube amp and a long-tail phase inverter as the most efficient manner of  driving a duet of 6L6GC's for 40 watts output (guitar version) and 50 watts output (bass only version).  The amp uses a 12AY7 first preamp for clean headroom with a dual-triode 12AX7 pre-amp tube to follow and a 12AX7 driver.   There are two "Normal" inputs and two "Bright" inputs. 

We build two versions of the 5F6A amplifier.  One version is based on the original 5F6A and is designed for the guitar.  Here, the first two preams are joined with a shared 250uf cathode bias capacitor and there are dual input jacks for the normal and bright channels.  The second jack on each channel is -3DB's.  This is an excellent channel for P9's or any other pickups with high output.  Tele's and humbuckers seem to prefer the 1st input jack but also benefit with greater headroom on input #2.  Thought the guitar can use either set of input jacks, most prefer the "Bright" channel, with the exception of those seeking low end growl!  We increase the power supply filtering to eliminate hum and allow for reserve power in the lower register.  We use four "period correct" Jensen P12Q Alnico speakers for the half-stack.

Our "Bass Only" version is customized and specially voiced for the Bass Guitar, though we have still left the "Bright" channel fully functional for the guitar.  With this version, we replace the tube rectifier with a solid state rectifier raising the operating voltages and the output power throughout the amplifier.  Here, we dramatically increase the power supply filtering to produce a tight low end and provide the reserve current necessary to drive the bass speakers to full output.  Wit this version, we split the cathode caps on the first preamp so the Bass preamp has its own voicing and is separated from the guitar input jacks.  The bass channel has a 250uf bypass capacitor while the guitar channel utilizes the standard value 25uf capcitor.  We use four Weber "heavy" 10FH Ceramic speakers each with 60 once magnets for this half-stack.  The bass only version  weighs in at 5lbs heavier as a result of the addtional speaker weight.

Both versions can be built as a 4 X10" half-stack or special 2 X 10" mini-Bassman for those who desire a smaller cabinet size and less weight.  The Classic 5F6A puts out approximately 40 watts while the Bass version puts out 50 watts. Controls are Normal Volume, Bright Volume, Treble, Mid, Bass and Presence.  Vintage "chicken-head" knobs are on the deck.  Both size cabs are constructed with solid finger jointed pine.  The 5F6A Bassman can be ordered in the traditional Tweed with Oxblood grill and Brown Dogbone handle, or you may select any color combination you like from our choice of colors below.  As with all FireBelly amplifiers, the '59 Bassman is hand built using a vintage fiber tag board with each component hand soldered one component at a time.  The tag board is raised above the chassis floor to eliminate vibration and allow for air circulation around the components.   Filtering is accomplished with F&T German electrolytic capacitors.  The tone caps are Mallory M150 coupling capacitors and silver micas.  These amps produces an extraordinary amoung of clean headroom and break-up and compression occur at just the right sweet spot.  With the Classic version, because a tube rectifier is used, finger sensitive "sag" is also available.  With the customized Bass only version, sag is eliminated through the use of a solid state rectifier and greatly enhanced power supply filtering.   The bass version is also designed to provide the maximum amount of clean headroom pushing the compression zone to the top of the volume control.  The '59 5F6A Bassman is a powerful tone machine, whether voiced for the Guitar or Bass.  The '59 BASSMAN is Dripping with Tone!







Shipping charges will be added to the above prices.



Other Models and Information


PR3512SE SERIES AMP (35 watts)

DL2212SE SERIES AMP (22 watts)

VB3510SE SERIES AMP (40 watts)

TWEED1955SE SERIES AMP (4-6 watts)

SINGLE STROKE TWEED AMP (10 or 12 watts)

5E3 1955 TWEED DELUXE (15- watts)

5F6A '59 BASSMAN SERIES AMP (40-50 watts)


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For more information, please CALL 310-701-1950 or send an Email.



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