Author Topic: F-2b mods for my guitar (Read 139 times)

metfan838 · « **on:** October 27, 2010, 05:46:32 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 · « **Reply #1 on:** October 27, 2010, 06:12:14 PM »

Was the F-2b in his regular rig?
I remember reading it was used for the Leslie signal path.

David Houck · « **Reply #2 on:** October 27, 2010, 06:36:22 PM »

I don't know Elwood; but a quick google found this.

elwoodblue · « **Reply #3 on:** October 27, 2010, 06:51:02 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 · « **Reply #4 on:** October 27, 2010, 07:03:30 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 · « **Reply #5 on:** October 28, 2010, 07:05:04 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 · « **Reply #6 on:** October 28, 2010, 07:24:58 PM »

just googled gilmour alembic mods and got my answer. The tube was added as a cathode follower to lower impedence

elwoodblue · « **Reply #7 on:** October 28, 2010, 09:23:22 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 · « **Reply #8 on:** October 31, 2010, 05:36:01 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.