Concept 16.5 Trimmers

[jdangel38]

Does anyone know a source for the DC Bias and Offset Trimmers used in the Concept 16.5?

I'm extremely familiar with mouser, digikey, arrow, etc. I'm hoping someone has experience
replacing these very parts and can offer time saving guidance.

Thanks in advance!

 

[rcs16]

Match for form fit and function. I have never worked on one nor do I have a pic or a full service manual.
You can try to clean the pots to save them.
You determined that they are defective because? you can not set the amp to spec? or just because you think it is needed

 

[w1jim]

Do you have a service manual for this receiver that would tell you how to set the bias and offset?

 

[rcs16]

Do not really need a service manual, I have a schematic, VR501 sets the DC offset and VR502 sets the o/p stage bias. Bias is set for around 30-50mA, it uses 0.5ohm emitter resistors so that is 30-50mV across the emitter of the o/p bjts.

 

[jdangel38]

Do you have a service manual for this receiver that would tell you how to set the bias and offset?

Sadly, no such information exists except apparently in the possession of "Pacific Stereo", and the owner of that site will not offer any help on how to fix anything. (He states that on his site). He says he sells parts but when I asked the question he wanted to know the "application" and when I told him a 16.5 unfortunately he had nothing to sell me.

There is a schematic floating around on the internet but it has no voltages on it, so it's not the most helpful.

I'm aware of what can be done to save pots, but these need replacement.
The difficulty is in figuring out exactly which one would be an appropriate replacement.