Rodek RA2150 need to set the bias

[Cartel]

If you power it up with the supply again, monitor the current draw at idle as you lower the voltage from about 14v down to 11v. Does the current draw increase as you reduce the supply voltage?

I think it does but very little then it settles back.
It differs from 1.100A to 1.110A

 

[Cartel]

Perry, can you tell me what these are?

They seem to get hot with the amp just idling.

thanks

 

[Perry Babin]

Are both in each pair getting equally hot?

I could be wrong but I think one in each pair is the VAS amplifier transistor (inverting amplifier). This one would run hot. The other in each pair might be the first in the triple-darlington driver/output group.

The collector of the VAS would go to the base of the first of the darlington group. Then the emitter of the first of the darlington group to the base of the small heatsink mounted transistor and its emitter would drive the base of the output.

 

[Cartel]

Are both in each pair getting equally hot?

I could be wrong but I think one in each pair is the VAS amplifier transistor (inverting amplifier). This one would run hot. The other in each pair might be the first in the triple-darlington driver/output group.

The collector of the VAS would go to the base of the first of the darlington group. Then the emitter of the first of the darlington group to the base of the small heatsink mounted transistor and its emitter would drive the base of the output.

I buttoned the amp up but I think they were all hot.
Feels hot is usually around 45-48C in reality for my fingers.

It works, the silicone is sufficient to apply some force.
Materials are just unrealistically expensive and has soured my mood.

I need to regroup.

 

[Cartel]

Just an update.
The amp is working great.
It gets "hot" but not hot tamale hot like I seen it before.

I'd like to set the bias again soon though because I didn't after I replaced some parts and that worries me.

Thank you for your help and comments!