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Build help and troubleshooting => MP573 Microphone preamplifier => Topic started by: tommythecat_80 on August 15, 2022, 11:10:50 PM

Title: Older model impedance switching
Post by: tommythecat_80 on August 15, 2022, 11:10:50 PM

Hi,
I have older model mp573,rev 1.4. How to change the input impedance to 300ohms? Via jumper?

Thanks
Tommy

Title: Re: Older model impedance switching
Post by: JPK on August 16, 2022, 09:08:59 AM

Yes, via jumpers:
The jumper header is JMP1, near the input transformer, near C31.
Standard 1200 setting (1 jumper) :
o o-o o
300 setting (2 jumpers) :
o-o o-o

Title: Re: Older model impedance switching
Post by: tommythecat_80 on August 16, 2022, 02:12:19 PM

Thank you for quick answer! Problem solved..
I wonder was the second jumper included the kit? I didnt built the unit

Title: Re: Older model impedance switching
Post by: tommythecat_80 on August 16, 2022, 02:25:46 PM

Or can I use the jumper on the Eq socket? Not gonna connect the Eq any time soon.

Title: Re: Older model impedance switching
Post by: JPK on August 16, 2022, 06:06:46 PM

I wonder was the second jumper included the kit?
It isn't.

Or can I use the jumper on the Eq socket? Not gonna connect the Eq any time soon.
The jumper on the MP573-CN1 is needed when the EQ is not connected.

Jumpers (https://www.ebay.com/itm/201414920591?hash=item2ee543c98f:g:PT8AAOSwU9xUSNNz&amdata=enc%3AAQAHAAAAoBmAncnykVRnf0EWxDs4k5ypkCMhRKTxOzCsbwSUXud1rumr0MJ19tphIvv%2FTh9XLFfZX7BzAvfK%2FkbRqoD%2BtcPe0AqkX9fz4RTy%2BlyTNC6x1nLPX4NeFly24LNa8lPAO7%2BwY1CDXpc0b%2BHdxfPF5tXwD5ZpiM2fxnpyqGY3aPYFZvKsfbLkHtO17p1JaWe9ODENAY%2BweHg%2FN34GND3azjM%3D|tkp%3ABk9SR7DRu_bUYA)