diyAudio (
-   Solid State (
-   -   nad 3020b idle current (

reddish75 4th July 2008 02:12 PM

nad 3020b idle current
hi, i would like to be able to adjust the idle current in my nad 3020b by using a pot, however my knowledge is very limited so im asking if anyone would point me in the right direction? heres the schematic for the 3020b


jaycee 4th July 2008 02:26 PM

If you mean, you are looking for a pot to tweak in the circuit, there isn't one.

If you mean you want to add one, then you would replace R645/646 with pots. You might also want to check if RX1 and RX2 are actually fitted and if so, what their values are.

reddish75 4th July 2008 02:29 PM

sorry yes i want to add a pot any ideas on resistance? are those resistors the only parts i need to remove?


YFW 4th July 2008 02:35 PM

The spirit of NAD3020 is zero-adjustment and easy to maintain/manufacture.So I think it's not required to modify it.
If you insist to do this,you need to add a adjust bias circuit and emmiter resistors which will change the structure a lot.

reddish75 4th July 2008 02:46 PM

yes its easy to maintain and adjust apart from the idle current which is fixed bias, so if this drifts the procedure to rectify this is tough to do for amutures like me, so adding a pot to adjust this current to recomended values would be great.


All times are GMT. The time now is 04:36 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2