Solid State Guitar Amp Forum | DIY Guitar Amplifiers

Solid State Amplifiers => Preamps and Effects => Topic started by: joecool85 on June 11, 2006, 07:56:11 PM

Title: Simple preamps are ok to me
Post by: joecool85 on June 11, 2006, 07:56:11 PM
I'm thinking about doing a simple preamp with a volume and a tone knob.  No EQ stack, just tone.  I think I could do a simple TL071 circuit to do it along with a tone setup from a big muff pi or something.
Title: Re: Simple preamps are ok to me
Post by: RDV on June 11, 2006, 08:55:32 PM
You could just do the volume recovery stage and tone from the BMP. I'd suggest a JFET buffer(4 hi imp in) then the Tone/recovery stage.

RDV
Title: Re: Simple preamps are ok to me
Post by: SECONDandBOWERY on June 11, 2006, 08:56:50 PM
Check out the 18watt Lite IIb volume/tone controlls.  Very simple and apparently, very effective.

18watt Lite IIb Schematic:
http://www.18watt.com/storage/18wattLite2b.gif

Here's a quote from a boutique builder after I asked him about his thoughts on the 18watt Lite IIb tone controll vs. a TMB:
Quote from: A boutique amp builder
I personally don't really like the TMB tonestack. There isn't anything dramatic in its correction I am missing in the one knob tonestack. But that's only me...

Rock'n'Roll,
--Andy
Title: Re: Simple preamps are ok to me
Post by: RDV on June 11, 2006, 09:14:55 PM
(http://fatboy.ssguitar.com/index.php?dir=schems/&file=BMP%20Pre.GIF)

Just an idea.

RDV
Title: Re: Simple preamps are ok to me
Post by: joecool85 on June 11, 2006, 09:30:36 PM
That's something I wouldn't mind trying right there...
Title: Re: Simple preamps are ok to me
Post by: RDV on June 11, 2006, 09:35:34 PM
(http://fatboy.ssguitar.com/index.php?dir=schems/&file=18%20Pre.GIF)

Another idea. I'd breadboard 1st though.

RDV
Title: Re: Simple preamps are ok to me
Post by: SECONDandBOWERY on June 11, 2006, 09:38:14 PM
Instead of just using the 18watt tone controll with the BMP output stage, i'd actually try to clone the 18watt preamp but just using two Jfets in parallel instead of the two tube triodes in parallel.

Rock'n'Roll,
--Andy
Title: Re: Simple preamps are ok to me
Post by: RDV on June 11, 2006, 09:39:04 PM
That's something I wouldn't mind trying right there...
The 18 watter tube? If so... me too!

RDV
Title: Re: Simple preamps are ok to me
Post by: RDV on June 11, 2006, 09:40:29 PM
Instead of just using the 18watt tone controll with the BMP output stage, i'd actually try to clone the 18watt preamp but just using two Jfets in parallel instead of the two tube triodes in parallel.
Be sure and post a schem when you get it working!

RDV
Title: Re: Simple preamps are ok to me
Post by: RDV on June 11, 2006, 10:08:04 PM
Instead of just using the 18watt tone controll with the BMP output stage, i'd actually try to clone the 18watt preamp but just using two Jfets in parallel instead of the two tube triodes in parallel.
Be sure and post a schem when you get it working!

RDV
You might want to check the Eighteen at Runoffgroove.

RDV
Title: Re: Simple preamps are ok to me
Post by: SECONDandBOWERY on June 12, 2006, 02:27:15 AM
Instead of just using the 18watt tone controll with the BMP output stage, i'd actually try to clone the 18watt preamp but just using two Jfets in parallel instead of the two tube triodes in parallel.
Be sure and post a schem when you get it working!

RDV
You might want to check the Eighteen at Runoffgroove.

RDV
Yes, I've seen that.  In fact, once I get thru the RAT project and now the LM3886, I think I might try a circuit like a Blackface Fender Deluxe Reverb version of their tube inspired Jfet pedals (I have so many circuits I'd like to build, it's rediculous).  But, not to get too off track, my suggestion way to run two Jfets in parallel, and use the Lite IIb tone controll (also found on the tremelo channel of the amp) instead of the regular one.

Rock'n'Roll,
--Andy