Hi
i just started using ltspice.
im trying to sim a 6sl7 driving a 45 tube, my confusion is at the output of the 45 tube. When i try to make a transformer with 5k imp by setting the inductance ratios it gives almost no output power swing, if i increase the inductance alot it gives more realistic vpp. what am i missing??
i just started using ltspice.
im trying to sim a 6sl7 driving a 45 tube, my confusion is at the output of the 45 tube. When i try to make a transformer with 5k imp by setting the inductance ratios it gives almost no output power swing, if i increase the inductance alot it gives more realistic vpp. what am i missing??
I don't mean to be rude, but Im not seeing a lot here that is correct.
R2 needs to be more like 200K or above as per the tube data sheet. https://frank.pocnet.net/sheets/127/6/6SL7GT.pdf
Both cathode resistors need to be deleted and reimplemented. The text should look more like the resistor for R2.
The cathode resistor on the 6SL7 should be more like 1K and not 100 ohms. You may want to bypass it with a capacitor, or not, but I probably would.
Your 45 cathode resistor definitely needs to be bypassed with a capacitor which is probably where you are getting your weak output from.
Your B+ needs to be more like 300+ volts or so. The standard operating point for a 45 is 250v on the plate and 50v on the bias, so 50+250+some losses in the resistance of the transformer primary is probably somewhere around 305. Maybe more, maybe less depending on your choice of transformer.
Your signal input also needs to use a more appropriate frequency. Try 100 hz and not 5.
If you do all of this, you should at least be much better off. We can go from there.
R2 needs to be more like 200K or above as per the tube data sheet. https://frank.pocnet.net/sheets/127/6/6SL7GT.pdf
Both cathode resistors need to be deleted and reimplemented. The text should look more like the resistor for R2.
The cathode resistor on the 6SL7 should be more like 1K and not 100 ohms. You may want to bypass it with a capacitor, or not, but I probably would.
Your 45 cathode resistor definitely needs to be bypassed with a capacitor which is probably where you are getting your weak output from.
Your B+ needs to be more like 300+ volts or so. The standard operating point for a 45 is 250v on the plate and 50v on the bias, so 50+250+some losses in the resistance of the transformer primary is probably somewhere around 305. Maybe more, maybe less depending on your choice of transformer.
Your signal input also needs to use a more appropriate frequency. Try 100 hz and not 5.
If you do all of this, you should at least be much better off. We can go from there.
Oh increasing the freq to 100hz solved it. Thats explains the inductance thing, as i said im beginner, thanks!
