Feedback Loop help

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KevinLee

Member
Joined 2002
:) Hello Everyone,

I have a Rotel RA930AX integrated amplifier. I have completed numerous upgrades such as:

-discreet bridge built with soft recovery diodes.

-bypassed all tone controls and hardwired with Nordost cable from input to volume control. (now only one source can be used).

-replaced all applicable caps with Elna Cerafine.

-added 22000uf Elna Cerafine caps to power supply.

-Changed op-amp to AD827.

-Replaced all resistors with Roederstein metal film.

-Paralled .1UF Solen and .01 Teflon(russian) cap in power supply.

-Removed plastic covers from all caps including the 22000uf ones and put a damping material on the caps.

-Replaced speaker outputs with better Vampire units (hard wired to board with Nordost cable. Also replaced RCA inputs.

That is about the extent of the upgrades so far.

I plan on upgrading the volume control.

What I want help with is identifying which components are in the feedback loop. I want to replace these components with better resistors/capacitors.

Does anybody have a schematic and can help me identify them?.

I am not too good with circuit topology.

Also, what would be the next logical upgrade to do to this amp.

Thanks for reading all this.

Cheers
KevinLee
 
H

halojoy

On Hiatus
Joined 2002
From the output point,
there should be 1 or two small resistors going
in direction to the input transistors.
Often is a small capacitor right beside the resistor.
They are in parallell.

It can also be a track that goes halfway from the output
back towards the input.
and then the resistor/cap is closer to the input.
The input is mostly one or two pairs of transistors,
with close body contact to eachother.
 
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