Sano 300 - A pair of questions

[kagliostro]

I was reading a thread (at Ampgarage) about the Sano 300 Amp

a schematic was found and I managed a bit to have it more readable

a guy noticed that the jfet 2N5461 on the schematic has something of odd

and infact the simbol used is the simbol of an SCR Diode instead of the simbol of a jfet



As I understand near nothing about Solid State I don't understand what those two Jfet are doing on the circuit and it will be nice to have info about

the more, I've put 3 letters A - B - C on the connection of what seems an SCR, if someone can indicate the corrispondance of A - B - C with the Source - Drain - Gate of the jfet I would like to try to correct the schematic putting there the correct simbol for the jfet



Thanks

Franco

[sluckey]

The attached pic shows the correct way to connect that jfet. The tremolo signal is applied to the gate and simply varies the resistance between the drain and source, thus changing the gain of V1a and/or V1b.

[astronomicum]

As I understand near nothing about Solid State I don't understand what those two Jfet are doing on the circuit and it will be nice to have info about

The Jfets allow for one tremolo signal to be connected to both channels while keeping the cathodes isolated from one another; a reverse mixer if you will. You could accomplish the same thing with SCRs which may have been the original intent.

[sluckey]

You could accomplish the same thing with SCRs which may have been the original intent.

I don't see how that's possible in this circuit since there is no current flow through the jfet.

[astronomicum]

As I understand near nothing about Solid State I don't understand what those two Jfet are doing on the circuit and it will be nice to have info about

You could accomplish the same thing with SCRs which may have been the original intent.

Maybe they thought as I did 

[kagliostro]

Ciao Steve

Many thanks

Many thanks also to you astronomicum

Franco

[PRR]

2N5461IS a JFET.

Just because some guy in Irvington NJ (I've been there) drew it wrong is no reason to go off in the weeds.

https://www.jameco.com/Jameco/Products/ProdDS/253905.pdf
https://alltransistors.com/adv/pdfdatasheet_motorola/2n5460_2n5461_2n5462.pdf

http://www.larryjohnmcnally.com/sano_amps.html