tablebeast

I have messed with these PM1k modules from Yamaha for years. I've found bits and pieces of info from all over the net in addition to my own experimenting. But it seems like as time goes by the best information gets harder to find. Some of the info I have seen before even seems to have disappeared completely as well. So, all this considered, I figured I would take on this project as a video series and put as much info as I can in one place. I started a YouTube playlist of some videos that I have made documenting my current project, which is turning into a 4U monster with all kinds of circuit changes and mods that I usually don't see in a lot of the rack jobs out there. I welcome anyone to help add to this thread any pertinent information that they may have. I will be adding more info, pics and videos as I move forward with my own project here as well. Here is a link to the vids I have up already. I will be adding to them as the project progresses.

https://youtu.be/puLBnUS_Jes

Now that I have some Monitor/Master, Headphone/Echo, and Talkback/Oscillator modules to go along with the Pre+EQ ones, I will be doing a video series for each. A few quick notes on my plans...

The Preamp modules will get everything optimised for channel strip use. Phase switch is moved to the input. Phantom power will be rewired in the standard way. The EQ values are all changed: making the low cut filters 75hZ and 150hZ instead of 40hZ and 80hZ, mid range EQ points are moved down a bit: closer to 800hZ, 1.6khZ, and 3.2khZ, and the high freq shelf is moved out to 12k. The echo sends will be placed in series in front of the output line amp as an fx send/return that can be cranked for some drive. Pan pot will be swapped for the output fader pot. The four switches from the channel sends will be repurposed for: +48v phantom, EQ bypass, FX loop bypass, and feedback mode. GA80080 output transformer will be added.

The Master modules will be converted to high gain mic preamps. The monitor gain block is put in series in front of the other two stages and a feedback pot will be added. It will also have an FX loop that can be bypassed. Pad, phase, +48v, and line amp feedback mode switches will all be added.

The echo section will have the 8 white pushbutton switches repurposed for a passive mixing bus. The 2 blue pushbuttons will patch the headphone feed in parallel ahead of the output line amp. The headphones will be rearranged with a hardwired booster section ahead of the IC stage.

Not sure what to do with the talkback/oscillator circuit yet, but something fun will be done with it! I'm open to suggestions.
« Last Edit: May 09, 2020, 05:11:27 PM by tablebeast »


scott2000

Re: Definitive Yamaha PM-1000 Information and Discussion Thread
« Reply #1 on: May 04, 2020, 08:45:01 AM »
Very cool!
Thanks for sharing!

Yeah that fader is awesome...lol

Ricardus

Re: Definitive Yamaha PM-1000 Information and Discussion Thread
« Reply #2 on: May 04, 2020, 11:37:38 PM »
I've never used a PM1000. Do you really like the sound? Is there some magic there worth preserving?
Audio mastering for hire..

tablebeast

Re: Definitive Yamaha PM-1000 Information and Discussion Thread
« Reply #3 on: May 07, 2020, 02:32:48 PM »
Oh yeah, these things really are the best bang for the buck once you recap them. Larger caps on the rails and coupling really open up the bottom end. Some guys like to swap out transistors for a more modern, faster slew rate, but I prefer the originals exactly FOR their slower nature. The inductor EQ also is made way more useful with just a few tweaks. I'll show you exactly what I'm talking about with the video series. I plan on covering everything I can! If anyone has any suggestions for video content lets hear it.
« Last Edit: May 09, 2020, 05:13:57 PM by tablebeast »

tablebeast

Re: Definitive Yamaha PM-1000 Information and Discussion Thread
« Reply #4 on: May 07, 2020, 02:37:07 PM »
By the way, I have a new episode up today. It is the 4th episode.

https://youtu.be/ErpAD2KPVIs

I also have a dozen extra Tamura GA80080 output transformers available if anyone needs some. Here is an ebay link.

https://www.ebay.com/itm/293572028435

JW

Re: Definitive Yamaha PM-1000 Information and Discussion Thread
« Reply #5 on: May 08, 2020, 12:00:54 PM »
Sure wish we were closer. I'd take the mixer chassis off your hands. Ever drive to Oregon?

tablebeast

Re: Definitive Yamaha PM-1000 Information and Discussion Thread
« Reply #6 on: May 08, 2020, 08:15:26 PM »
No, sorry. I don't have any plans to visit the PNW. Though I bet there is a way I could take it apart if you wanted to optimise the cost of shipping and have me send it.

Re: Definitive Yamaha PM-1000 Information and Discussion Thread
« Reply #7 on: May 12, 2020, 10:24:36 AM »
Hi Tablebeast,

I need a few of the female edge connectors that live on the backplane of the console chassis. Can you make that happen?


 

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