24 volt to the fetzer valve

[wavenator]

ok
i've just built the fetzer valve
it has no tubelike sound and has veryvery low gain (2n5457 trans)
is it possible to use 24 volt and rebias the transistor?

[brett]

check the pinout on the JFET.
and send some voltages.

[aron]

It's probably not biased correctly or is wired incorrectly. Are you expecting it to sound just like a tube?

[wavenator]

ok first
i expected it to sound like in the clips
second i biased it correctly
it is wired correctly for sure

i'm just want to know if it is possible to use it with 24 volt ?

[km-r]

the 5457 will just give you a gain of about 2 times[?]...
and the gates will reach its cutoff at about 2.5v IIRC, J201 has 0.6 IIRC again
so... you need another stage for clipping OR use a booster in front of it

[wavenator]

k i tried the fetzer again and it has much moregain (without a booster)
well
the question is still relevant
is it possible to use a 24 power supply or not?

[frankclarke]

Yes, you can. Try it and see.

[petemoore]

  Hooking up components...gotta watch polarity and max rated voltage...[ie refer to component or data sheet] otherwise you should be ok.

[wavenator]

http://www.fairchildsemi.com/ds/2N/2N5459.pdf

source voltage looks like max of 25
it is ok?

[stm]

No problem with the 24V supply.  Your 2N5457 won't go bad as soon as it reaches 25V, so 24V should be just fine.  In addition, you have the drain resistor to limit current to a few mA in the unlikely event that the drain-gate junction enter into conduction, so there'll be no smoke.

In our experience Fetzers at higher voltages sound slightly better than at 9V, so increasing voltage is advised.  In fact, there might be a new project from ROG in the near future using more than 9V.

Regarding 2N5457's, the average value I've seen are:  Vp=-1.6V and Idss=3.3mA.  Using the Fetzer Valve Calculator with 24V supply you get the following parts list:

Vcc = 24V
Rsource = 390 ohms
Rdrain = 5.6 k  (should use a 10k or 20k trimpot)
Vdrain = 15.5 V

Good luck!

[B Tremblay]

In fact, there might be a new project from ROG in the near future using more than 9V.

This is a violation of the runnoffgroove.com NDA.  I've contacted INTERPOL.   

[wavenator]

No problem with the 24V supply.  Your 2N5457 won't go bad as soon as it reaches 25V, so 24V should be just fine.  In addition, you have the drain resistor to limit current to a few mA in the unlikely event that the drain-gate junction enter into conduction, so there'll be no smoke.

In our experience Fetzers at higher voltages sound slightly better than at 9V, so increasing voltage is advised.  In fact, there might be a new project from ROG in the near future using more than 9V.

Regarding 2N5457's, the average value I've seen are:  Vp=-1.6V and Idss=3.3mA.  Using the Fetzer Valve Calculator with 24V supply you get the following parts list:

Vcc = 24V
Rsource = 390 ohms
Rdrain = 5.6 k  (should use a 10k or 20k trimpot)
Vdrain = 15.5 V

Good luck!

thx bro
i will try it soon and tell you the results how it sounds like
btw atm on full volume and high volume on amp it sounds kinda crunchy and tuby
but not too much