ROG "Flipster" Bass amp sim ..

MartyMart · January 12, 2006, 04:16:20 PM

... My Bass was getting jealous of all the gtr "toy's" so it needed a present !
I normally record it via a Tech 21 Bass DI, which is fabulous .... so ....
The flipster sounded interesting and would offer another tone for bass recording.
I built it with all J201's, biased to between 5.5 and 6v
Added a 1uf poly input cap ( had some noise/hash without) and to Q1 used a 68k and 4M7 to ground.
I have run out of 1M pots, so changed the tone control to a Big Muff setup, which works rather well !
nice and flat at 12 o'clock and bass boost left/treble boost right of centre.
It has a great sound, with a nice amount of "grit" when the pregain is dialed up.
It works well with the condor too, though I have to add a bit of low end back in from my desk EQ.
All in all, well worth building and it will get used next week for some bass recording.
Perhaps I'll post a clip then
Another "thumbs up" for the ROG amp sim guru's

MM.

MartyMart · January 12, 2006, 07:09:54 PM

I wasn't very "specific" earlier and was pushed for time ....
Anyone who's interested in a good Bass preamp should build this, I find
it has a really good "Amp" sound to it, seems to put some "air" and "depth" to the
bass, either in front of an amp/cab or the condor cab sim.
The "grit" when used subtly is lovely ...
Very pleased with it, 9/10 ..... this will get used a LOT !

MM.

Bernardduur · January 13, 2006, 04:44:56 AM

I know!! I finally fixed mine (turned out I was making a short circuit through three layers of ductape).....

Oh, and the gain pot was broken

Now I need some experimenting, but I really like this one.

MartyMart · January 13, 2006, 05:09:42 AM

That's great, I'm pleased that you've got it working

I had to "re-flow" the solder on the 1M gain pot, it was cutting out a little
all fine now .
I'm VERY pleased with this little amp sim ..

MM.

nelson · January 13, 2006, 05:21:26 AM

I am using it as a solid state bass preamp.I have the board populated etc, just need to make the power amp.

nofretsplz · February 01, 2006, 08:04:11 PM

Martymart, how quiet is the Flipster (noise, hiss, etc.) compared to the Sansamp? By way of reference, my Bass DI gets audible hiss when any of the pots are turned past 1 or 2 o'clock.

I happened on a '67 B-15-N a few years ago, but I usually play in venues that don't allow amps.

Runoffgroove's sound sample of the Flipster pretty much nails the B-15 sound!

Also, does anyone happen to remember whether these transistorss can handle a bigger power supply, like +-15V or something? I'm hoping to build a version with as low a noise floor as possible.

Nofretsplz

Bernardduur · February 02, 2006, 03:41:03 AM

I am running mine on 18V.... bias around the 15V or so.....

I am planning to build a tube version of it soon (well, just the normal preamp so my SS amp has a tube preamp)

nofretsplz · February 02, 2006, 08:56:07 AM

That will be fun! The only problem I have with my B-15 is that the preamp tubes are 6SL7...the only good 6SL7's are NOS at $25 each. If you can make a 12AX7 version, that would rock.

Bernardduur · February 02, 2006, 09:01:58 AM

Will see....

First a vacation

nofretsplz · February 04, 2006, 01:02:42 AM

BTW, does anyone know how the Flipster is in terms of hiss/noise?

I pulled up the spec sheets on the transistors involved, and they all can take up to +-25V on the rails. I'm mainly looking for the clean sound, not actual overdrive. Come to think of it, my B-15 never actually gets into real overdrive territory (distortion)...just reeely warm tube sound.

MartyMart · February 05, 2006, 12:16:36 PM

sorry for the delay .... been away
It's VERY quiet ... virtualy no noise at all unless all controls are flat out !

MM.

Bernardduur · February 05, 2006, 12:53:44 PM

Yep!

I have one problem: when the gain is set too high I have a terrible bleed through when the pedal is off. The bleed is a high pitched "whine". Anyone knows a remedy??? It is true Bypass

tazwolf · February 05, 2006, 02:16:23 PM

I'm currently building a flipster.
I am thinking of using a DRV134 balanced line
driver chip to be able to output straight to a mixer.
I'm thinking of feeding the output of the Flipster after the
vol pot.

Heres a datasheet for the drv
http://focus.ti.com/docs/prod/folders/print/drv134.html

I'm not going to be using it as a stomp pedal but as a DI
for my bass.

I'm thinking of powering it with a 9v wallwart feeding 9v to the flip and
a voltage divider to provide +- 4.5 for the DRV chip.

Can anybody see any problems?

/taz

B Tremblay · February 05, 2006, 03:26:13 PM

Quote from: Bernardduur on February 05, 2006, 12:53:44 PM
I have one problem: when the gain is set too high I have a terrible bleed through when the pedal is off. The bleed is a high pitched "whine". Anyone knows a remedy??? It is true Bypass

Re-wire the switch to ground the circuit input when bypassed.

Bernardduur · February 05, 2006, 04:51:08 PM

OK, thanks!

nofretsplz · February 05, 2006, 10:26:02 PM

"It's VERY quiet ... virtualy no noise at all unless all controls are flat out !"

Wow...more quiet than your Tech 21 Bass DI, yes? If it's at least that quiet, I can use it! I'm not too interested in flat-out settings, either. Just a bit of warmth and EQ will be just fine.

News:

ROG "Flipster" Bass amp sim ..