What to do with this circuit ??

[HOTTUBES]

Tillman circuit .... what's a good use for it ??
Any idea's would be appreciated !!
Thank you !

[mistahead]

It's a very simple little "front of chain" preamp, low parts count, better sounding in many situations where bjt or opamp buffer could be used.

The article written with the original schem discussed FET rather than opamp clipping, as well as the reasons it may be a desirable part of the signal chain.

The fets used to be cheaper too.

[GibsonGM]

It's a very simple little "front of chain" preamp, low parts count, better sounding in many situations where bjt or opamp buffer could be used.

The article written with the original schem discussed FET rather than opamp clipping, as well as the reasons it may be a desirable part of the signal chain.

The fets used to be cheaper too.

Pretty much, you could use it anywhere you want to boost a signal.   Now, as for how it would sound (what filtering is going on), couldn't tell ya.  Do you want clean, or colored?  Like, an LPB is midrangey - one might not want that if feeding a distortion pedal.  So, it's up to YOU what you use it for )    A decent building block.   

Much easier to get a sense of filtering etc. if a schematic is posted rather than those layout deals.  They tell you very little about the circuit unless you want to go digging....

[HOTTUBES]

I'm looking for clean boost .

Could this tillman circuit be compared to the SHO ?

[mistahead]

The Tillman preamp is closer to a transparent buffer more than it is the SHO or another booster... In my opinion at at rate:

Original article, with schematic and much relacant info:
http://www.till.com/articles/GuitarPreamp/

Plus throw Tillman in the search engine here and you get a LOT more info again.

Good little circuit... not sure it it will hit the spot you are after, might do - easy to breadboard/test.

[aron]

It's good for the front of an acoustic guitar mic. Sounds pretty good.

[mistahead]

Sounds great in front of starved plate 12A_7 tubes too.

Putting JUST this in a rig and using amp OD gave some DYNAMICS (well bit more brightness and a more defined mid) than not having anything between my LP and Laney.

Again I think of it more as a buffer with some positive qualities than I do as a Booster.

[chi_boy]

Works as a preamp for a piezo pickup for a cigar box guitar too.

[HOTTUBES]

Well just for fun , i built this circuit as shown on a small piece of vero , but i was just wondering a good use for it .


Thanks for everyone's input , i will look around some more using the SEARCH BOX idea mentioned above .


I was wondering what it would sound like with this Tillman circuit going strain into a sho .... hmmmm !! me thinks ....

[mistahead]

I think you can misbias the JFET in there making it a bit gainy rather than as tranparent as it tries to be "on the schem".

I love it as my line driving buffer (is that the right term guys?) front of the chain - bring the signal up and push it through, no knobs, just a little black box with a DC jack and some mono jacks.

What is the active in the SHO again? Want to build one - oddly never do, but if I recall its fun and games at the input impedance level, this is where the Tillman can shine... I think... I feel... I maybe...

[duck_arse]

I always hear "clank" when I put a tillman in front of my marshall lead 12.

[amptramp]

The nice thing about a Tillman is you can split the circuit in two, putting the gate and souce resistor and FET inside the guitar or inside the cable plug at the guitar end and the drain resistor and output and decoupling capacitors and the resistor referencing the output to ground on the other end.  Then you can have a guitar with internal boost and low output impedance or a cable that amplifies.  The circuit is small enough to go inside a guitar and with some care in layout, may be small enough to fit inside a cable plug.  The receiving end is just a box with the battery, two resistors and two capacitors.  You could add a regulator for external DC wallwart supplies.