F-2b mods for my guitar

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Author Message metfan838 New Username: metfan838 Post Number: 1 Registered: 10-2010 Posted on Wednesday, October 27, 2010 - 5:46 pm:    I know Dave Gilmour uses the F-2b and has been for years. The gilmour web-site said they changed capacitor values to make it less bassy and added a preamp tube...any suggestions. elwoodblue Senior Member Username: elwoodblue Post Number: 1118 Registered: 6-2002 Posted on Wednesday, October 27, 2010 - 6:12 pm:    Was the F-2b in his regular rig? I remember reading it was used for the Leslie signal path. davehouck Moderator Username: davehouck Post Number: 9776 Registered: 5-2002 Posted on Wednesday, October 27, 2010 - 6:36 pm:    I don't know Elwood; but a quick google found this. elwoodblue Senior Member Username: elwoodblue Post Number: 1119 Registered: 6-2002 Posted on Wednesday, October 27, 2010 - 6:51 pm:    Thanks Dave, ...and Welcome Eric...good question, I wonder if the extra tube stage was added in the front, if so you might be able to simulate what Gilmour was getting by putting something like a BK tube driver before the F-2B. lbpesq Senior Member Username: lbpesq Post Number: 4623 Registered: 7-2004 Posted on Wednesday, October 27, 2010 - 7:03 pm:    I use an F-2B through a Mesa 50/50, along with a Demeter Real Tube Reverb and a SF-2 in my guitar rack rig. The F-2B works fine as a guitar preamp. In fact, IIRC, the F-2B is based on the Fender Dual Showman, a guitar amp. Bill, tgo metfan838 New Username: metfan838 Post Number: 2 Registered: 10-2010 Posted on Thursday, October 28, 2010 - 7:05 pm:    Thanks guys...I googled this topic for our and got many different opinions...It sounds great now but I just like to tweak on things metfan838 New Username: metfan838 Post Number: 3 Registered: 10-2010 Posted on Thursday, October 28, 2010 - 7:24 pm:    just googled gilmour alembic mods and got my answer. The tube was added as a cathode follower to lower impedence elwoodblue Senior Member Username: elwoodblue Post Number: 1120 Registered: 6-2002 Posted on Thursday, October 28, 2010 - 9:23 pm:    Cool, I see that mentioned in the thread here I see how a lower impedance would be good for Gilmour's rig considering how many pedals/processors might follow the F-2B. Half way down this page it mentions: "To optimize the unit for guitar, it was modified by adding an extra tube in the preamp section for a little more drive, lowering the impedance in the output and changing the capacitor in the bottom end to eliminate some of the lows to prevent “boominess” in closed-back cabinets." gtrguy Advanced Member Username: gtrguy Post Number: 319 Registered: 9-2004 Posted on Sunday, October 31, 2010 - 4:36 pm:    Mine is set up so you can easily cascade the first tube stage into the next, but it does not do anything exciting for me that way.