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MP566 Tube microphone preamplifier / Re: Faulty MP566 - video and audio files

« on: January 28, 2022, 09:53:19 PM »

The blinking only happens with the mp566.. all other modules in the rack work fine. 
The pre passes audio and is usable but after about 5-10 mins the blinking starts, the spikes in the audio output start and it becomes unusable. 

Thanks for your help. 

S. 

2

MP566 Tube microphone preamplifier / Re: Faulty MP566 - video and audio files

« on: January 28, 2022, 01:36:30 AM »

Tested - 

So, no shorting,
High voltage reads at 225.2v
Low voltage read at -3.1. SMPro little lunchbox, probs why it a little low? 
It's my portable one, the other main rack is a JLM 8 slot.

So, this starts me looking towards a problematic tube ??

S.

3

MP566 Tube microphone preamplifier / Faulty MP566 - video and audio files

« on: January 27, 2022, 02:24:37 AM »

https://drive.google.com/drive/folders/1qz0BCwCTZi6MnlKaGArnJ7fTCu40vqWC?usp=sharing

Hi Everyone.. I was given this MP5.66 (happy!)... but its faulty. 

Attached is a link for some audio files and a short video file of the unit.
Not sure if I've done this right, but let me know either way.

Im about to go through the test document and see what I find, but any help would be great to get this going because Id love to buy another one to use for gain makeup in my summing setup.

Cheers, Steve.