1. We would like to remind our members that this is a privately owned, run and supported forum. You are here at the invitation and discretion of the owners. As such, rules and standards of conduct will be applied that help keep this forum functioning as the owners desire. These include, but are not limited to, removing content and even access to the forum.

    Please give yourself a refresher on the forum rules you agreed to follow when you signed up.
    Dismiss Notice

Fractal Audio AMP models: 65 Bassguy and Dweezil's B-man ('65 Blackface Fender Bassman, AB165)

Discussion in 'Axe-Fx II Discussion' started by yek, Feb 26, 2016.

  1. #1 yek, Feb 26, 2016
    Last edited: Aug 15, 2016
    yek

    yek
    Expand Collapse
    Moderator
    Moderator

    Joined:
    Sep 30, 2009
    Messages:
    20,903
    Likes Received:
    24,702
    Location:
    The Netherlands
    * EDIT: Up-to-date information is available in Yek's Guide to the Fractal Audio Amplifier Models *
    [​IMG]

    65 Bassguy: based on ’65 Fender Blackface Bassman (AB165 circuit)

    Dweezil's B-man: based on '65 Fender Bassman (AB165), Bass channel, modded by Blankenship


    We already discussed the ’59 Tweed Bassman. This version of the Bassman is a very different animal, which dates from the blackface/CBS period. Note: Fractal Audio modeled Dweezil Zappa’s personal amp.

    The Blackface Fenders were produced between 1964 and 1967. Pre-CBS blackface Fenders are in high demand, and not as expensive as the Tweed and Brownfaces. The blackface name originates from the black tolex and controls panel. More information.​

    The ’65’s AB165 circuit is dirtier and “nastier” than the previously discussed version of the Bassman ('59 Tweed). The AB165 gets Fender into Marshall territory. If I’m not mistaken this particular amp is an early ”CBS”-era model. That’s when CBS owned Fender (and in the opinion of many wasted a lot of great Fender circuit designs). That’s why the AB165 is not regarded as a true blackface amp by some. But it's still a great amp, just listen to Tyler Grund's clip below, or the model. More background information here and here and here.

    Cliff:

    The 65 Bassguy was matched to a 65 Bassman that Dweezil sent me. It's a vicious amp that sounds more like a Plexi than a Fender. It's the infamous AB165 circuit which is very crunchy and bright and does not sound like your typical Fender. I was told it is stock. Definitely not your father's Bassman. Has a pissed-off Marshall vibe to it."

    (Qauntum 3) "It's Dweezil's Blankenship modified Bassman. Dweezil's Bassman has two channels like a regular Bassman. The Normal channel is "normal" and corresponds to the 65 Bassguy Nrml model. The Bass Instrument channel is modified and that's the basis for the new model (Dweezil's B-man). It has a boatload of gain and sounds more like a Plexi than a Fender."​

    The AB165 puts out 50 watts through two 6L6 tubes. Cliff:

    AB165 uses 7025 preamp tubes (which are relabeled 12AX7). The phase inverter, however, is a 12AT7. The secret to the AB165 is the summing stage. It uses a inverting summing amp to sum the Normal and Bass inputs. This stage clips, because of all the local negative feedback, quite hard."

    It has two channels: “Bass instrument” and “Normal”. Fractal Audio gives us three models of this amp: 65 Bassguy Normal, 65 Bassguy Bass and Dweezil's B-man. The last one is based on the Bass channel, modded by Blankenship.

    The Normal channel has a Bright switch, which is enabled in the Normal model. There’s no model of both channels jumpered.

    The original AB165's controls are: Treble, Bass, Volume Bright and Volume Normal, and the already mentioned Bright switch. In the model the Presence parameter is maxed, because the real amp has a fixed Presence setting inside. There’s no Middle tone control, so keep this at “5” in the model for authenticity. No Master Volume either, so keep the Master control in the model dimed.

    Note that the range of the controls on this amp is 1 to 10, while the model's controls range 0 to 10. Here's a translation table, created by forum member Barhrecords.​

    Dweezil's modded Bassman has no tone stack.

    Cliff:

    "The actual amp has no tone stack so for maximum authenticity all tone controls would be at noon (but don't be afraid to tweak them). In the actual amp the Treble control is re-purposed as a Negative Feedback control. Experiment with different values of Negative Feedback. Lower values are looser."​

    The Bassman provides two inputs per channel. Fractal Audio models of Fender amps are always based on the input with the highest input level. To get the equivalent of using the lower input, set Input Trim to 0.500.

    Unlike the other Bassman, this Bassman was used with a 2x12 cabinet, with Jensen or Oxford 12” speakers. Find the 2x12” Fender stock cabs on this page. Marshall cabs also work well.

    A selection of videos on YouTube, including one from our forum member @Gamedojo (Tyler Grund).



     
  2. MesaGuitarGuy

    MesaGuitarGuy
    Expand Collapse
    Forum Addict

    Joined:
    Jan 21, 2011
    Messages:
    1,685
    Likes Received:
    1,283
    Location:
    Mesa AZ
    thanks yek!
     
  3. notalemming

    notalemming
    Expand Collapse
    Forum Addict

    Joined:
    Jan 25, 2012
    Messages:
    1,816
    Likes Received:
    805
    It's a cool amp but I wish there was a more typical blackface Bassman too. I had a 65 Bassman I liked it a lot. Much cleaner & warmer than the Axe model. Not to hijack the thread but is there another Fender model in the Axe that could get closer to the typical blackface Bassman? And thanks Yek for all the great info here & on the wiki!
     
  4. LeBigMac

    LeBigMac
    Expand Collapse
    Regular

    Joined:
    Oct 22, 2014
    Messages:
    65
    Likes Received:
    23
    thank you for doing this. very informativ and a good help for exploring the amps.
     
  5. VoteForPete

    VoteForPete
    Expand Collapse
    New here

    Joined:
    Feb 10, 2016
    Messages:
    3
    Likes Received:
    1
    Thanks for the great information!! It is great to read up on the amp models when I can't play them.
     
  6. Stratoblaster

    Stratoblaster
    Expand Collapse
    Fractal Fanatic

    Joined:
    Jun 21, 2009
    Messages:
    2,138
    Likes Received:
    1,158
    Location:
    Ontario, Canada
    I had one of these in the early 80's; bought it for $100 but it wasn't "a Marshall" so I flipped it for $65 when one of the tubes went wacky.

    ...always bummed that I didn't keep it; would love to have it now...
     
  7. soheil

    soheil
    Expand Collapse
    Forum Addict

    Joined:
    Oct 3, 2012
    Messages:
    1,427
    Likes Received:
    625
    Location:
    Iran
    Great threads. thank you yek.
     
  8. yek

    yek
    Expand Collapse
    Moderator
    Moderator

    Joined:
    Sep 30, 2009
    Messages:
    20,903
    Likes Received:
    24,702
    Location:
    The Netherlands
    Updated the OP, because of the addition of the "Dweezil's B-man" model.
     
  9. Josetxu

    Josetxu
    Expand Collapse
    Inspired

    Joined:
    Jul 15, 2014
    Messages:
    262
    Likes Received:
    135
    Location:
    Arroyo de la Encomienda (Spain)
    I've got a 1965 blackface bassman for a year and a half, it's an incredible amp. I'm willing to try Fractal's model when I receive my AX8 in the next weeks :D
     
  10. yek

    yek
    Expand Collapse
    Moderator
    Moderator

    Joined:
    Sep 30, 2009
    Messages:
    20,903
    Likes Received:
    24,702
    Location:
    The Netherlands
    Song by JvR (@Guitarjon) with the 65 Bassguy model.

     
    JOHNNYROCKIT and R.D. like this.

Share This Page