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Build help and troubleshooting => CP554 Diode bridge compressor => Topic started by: laurenz.zs on January 12, 2024, 09:52:12 PM

Title: CP554 and Matching
Post by: laurenz.zs on January 12, 2024, 09:52:12 PM

Dear all,

I hope you are doing well.

I found this sentence in an article:


"The diodes also need to be closely matched to maintain low distortion."


I would like to know more... 

Which diodes are they talking about? What about matching 2 Units?

What I found on the subject diode matching doesn't look easy to me. It also looks like quiet a bit of work.

I am myself in the process of assembling a pair of CP554.

With the 2-Bus in mind; Would it be worth to investigate on that subject?

Thanks a lot

Stay safe

Title: Re: CP554 and Matching
Post by: JPK on January 13, 2024, 11:50:57 AM

The trick in CP554 is that our diodes are already matched because they are taken from a Low Noise Transistor Array (THAT300). So, no need to match the diodes manually.
The matching for stereo is done during the setup. Any two properly setuped CP554 will be paired.

Title: Re: CP554 and Matching
Post by: laurenz.zs on January 18, 2024, 09:41:38 PM

Thanks a lot for the reply.

What about the other diodes?

Title: Re: CP554 and Matching
Post by: JPK on January 19, 2024, 03:36:43 PM

What about the other diodes?
Do you mean the diodes which are not part of the diode bridge used for the gain reduction?
If true, these diodes do not need matching.