Intact Audio

Thanks Dave. My idea of considering the inductor is a kind of experiment to push the boundaries in this preamp. The voltages to the sections are based on RC sections to arrive at the specified voltages- hence no issues here. I wanted to stay with the std values you have in your web page and not wedd...

Hi Dave, I am doing an upgrade of Marantz 7 pre ( probably for the 7th time!) and am keen to get your advise for the combination for the best sound. My current plan is to use: L2 (4.2H) inductor close to the anode resistor, with decoupling capacitor of 5uf using Audio note capacitor. I estimate the ...

Hi Naz,

Great update on your earlier schematic. What are the currents expected in tubes in 1,2 and 3?
Regarding input resistor for MC input can the 47k resistor be replaced with say a 220ohms or lower if I want to use a low impedance Mc cartridge such as OrtofonMC20.

Cheers!

B.Ravi

Hi Naz. Thanks for the suggestions . Will keep them in mind. I can arrive at the recommended value of caps by using a parallel combination of .22mfd, 0.1mfd and 0.07mfd. The last being made up of two 35nf silver mica caps which have a 0.5% tolerance!.I suspect the ultimate value will be limited by t...

Just got a message from USPS advising that Dave has posted a set of inductors as per Naz's design. Time for some serious planning and parts collection. I wish to use parts in my bin as much as possible before purchasing values I do not have. 1. Caps in the RIAA circuit. Can I use two of .22 mfd tota...

Thanks Naz. I used 2k Carbon comp resistors right at the gate to avoid possible oscillation. Some posts have indicated values of 330 ohms should be OK. However, my experience is limited to the power amp stages. To reduce dissipation I also used a resistor in series. This was in the tail of the phase...

Any experience in replacing the tube CCS with solid state?I have some boards for the Gary Pimm CCS which I have just put together and wish to build this circuit for my next phono stage. I have used CCS based on cascoded DN2540 in the power amp stages with good results. Hence my interest in using SS ...