|
Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
|
|
|
Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
|
In Reply to: phono stage RIAA question. posted by lovetube on February 25, 2011 at 20:24:13:
First, the circuit error.
The 330k resistor going to earth should not be a resistor, it should be a capacitor of roughly 0.33 x the value of the other capacitor.
I.e. 0.33 x 0.01uF giving 0.0033 uF.
Even so, the values of 0.01uF and 0.0033uF do not look right for the 330kohm series resistor. But for the sake of a simple component change you could try it.
I strongly suggest you search for Kurt Strain's excellent post (several years ago) on configuring an riaa circuit; you will learn a *lot* from it. You will also see why others suggest you try a different circuit.
I agree with others that this is not a good circuit and I suggest the following reasons.
I do not like the 330kohm series resistor. Stage 1 will struggle to drive stage 2 with such a large resistance in the way.
I do not like such small caps in the RIAA. The miller capacitance of the 2nd valve, and any stray capacitance, are highly significant compared to these small caps. I would expect the circuit to be difficult to get right for this reason.
I hope this helps ...
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- RE: phono stage RIAA question. - Mike C 08:11:01 02/26/11 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2024, Audio Asylum, all rights reserved ]
