Miller effect on tubes with active load CCS

[popilin]

Many do use an input cap to limit LF-woble (or what is it called?) from warped records.
I've been using battery bias on my preamp tubes and justified the input cap by the many warped records I have. If it hadn't been for that I'd probably not use bat-bias on first tube.

A capacitor is always better and more linear than a transformer, no capacitor is also better.

Benz Micro Gold

• Output: .5mV
• Stylus: .3x.7mil
• Impedance: 20 ohms
• Loading range: >200 ohms
• Weight: 5.7g
• Compliance: 15cu
• Tracking force: 1.7-1.9g

If you want to avoid an expensive transformer, your solution is here

Schematics

 

[Celsius]

grounded grid?

I don't understand.
in triode mode If IN is by g1 rg1 must be 220 R grid to ground for MC

 

[Osvaldo de Banfield]

If you use CCS for the anode, then the gain will increase as the load impedance does, but also the stray and miller capacitance becomes higher and the high end becomes lower in frequency. If you can feed forward a signal into the plate in counter phase, you cancel the effect of the miller capacitance.

 

[popilin]

A hybrid cascode, say 2SK170 and E280F (or E180F) triode connected, followed by passive RC EQ, and an SRPP output stage, same valves, is enough to build an excellent MC/MM phono stage. IMHO.

 

[SemperFi]

I don't understand.
in triode mode If IN is by g1 rg1 must be 220 R grid to ground for MC

I mean common grid gain stage. Input signal is into cathode and grid is connected to GND.
But if your source is low impedance, it should be able to drive the miller quite well shouldnt it?

 

[Celsius]

A hybrid cascode, say 2SK170 and E280F (or E180F) triode connected, followed by passive RC EQ, and an SRPP output stage, same valves, is enough to build an excellent MC/MM phono stage. IMHO.

I have Jfet j111, 2n5457, lnd150 and bf862, which one can replace the 2sk170

 

[popilin]

I have Jfet j111, 2n5457, lnd150 and bf862, which one can replace the 2sk170

These are even better: 2SK147, 2SK369, 1/2 2SK146, some paralleled BF862 can work too.

You also can go for a double BJT like MAT02, or its SMD replacement, but BJT is highly capacitive.

Morgan Jones has an entire chapter on the subject.