Cold clipper JFET?

[Tobyk]

Quick question – is it possible to use a JFET as a cold clipper? That is, the equivalent of a 100K Rp/10K Rc 12ax7? And if so, will it produce similar result to the signal?

[gingertube]

You have a problem putting in a JFET around valve circuits with high rail and signal voltages. Max Voltage drain to source is typically 40V at best. Could be done but protection circuitry would be a must.

If you want to try a solid state cold clipper I would suggest you try LND150 which is a deletion mode MOSFET.


Cheers,
Ian

[Tobyk]

You have a problem putting in a JFET around valve circuits with high rail and signal voltages. Max Voltage drain to source is typically is 40V at best. Could be done but protection circuitry would be a must.

If you want to try a solid state cold clipper I would suggest you try LND150 which is a deletion mode MOSFET.

Cheers,
Ian

I didn’t mean adding a jfet into a valve amp.
Thanks for the mosfet tip.

[martin manning]

Quick question – is it possible to use a JFET as a cold clipper? That is, the equivalent of a 100K Rp/10K Rc 12ax7? And if so, will it produce similar result on the signal?

Yes, you can bias a JFET "cold" and get asymmetrical clipping. Will it sound the same as a 12AX7? Not exactly, but similar. See here (in the .pdf) for an example of cold bias and the resulting waveform: https://ampgarage.com/forum/viewtopic.p ... 91#p211891

[Tobyk]

Quick question – is it possible to use a JFET as a cold clipper? That is, the equivalent of a 100K Rp/10K Rc 12ax7? And if so, will it produce similar result on the signal?

Yes, you can bias a JFET "cold" and get asymmetrical clipping. Will it sound the same as a 12AX7? Not exactly, but similar. See here (in the .pdf) for an example of cold bias and the resulting waveform: https://ampgarage.com/forum/viewtopic.p ... 91#p211891

Thanks!