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News: Please post general conversations, videos, music, and similar stuff in the "Tips, Tricks and General MCI conversations" section, use the Misc section for any product not listed in the categories, parts or custom projects. Thanks!

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 on: July 06, 2018, 12:46:05 PM 
Started by Berwyn636 - Last post by TonesOnTail
I made some prototype boards based on some fine and much appreciated correspondence with Harrison off forum. It was something like a twin-T Barry Porter hybrid with 3 bands of fully parametric EQ utilizing the feed forward summing amps and onboard gain pots from the stock 4030 revision channel strip. It worked well and sounded smooth, except at the extremes of the boost/cut ranges where they started to hoot and feedback pretty badly. I had worked on some design changes to tame the oscillations of the filter amps, but had not gotten to running a second prototype run of PCBs.

Harrison had suggested bypassing the entire EQ section if the main modules, and replacing the EQ summing amps and pots with a more common feedback topology. This would more than likely be the way to go, but would add further to the cost and modification per channel. Things like CT pots, multi deck pots with switches, etc, are mucho $$.  This quickly goes into the territory of exceeding the market value of 600 series channel strips. Even the first prototypes I made were around $100 usd per channel, using PET caps, sealed pots, etc.

 on: July 05, 2018, 11:11:25 PM 
Started by Berwyn636 - Last post by MM1100
Coming in two years later! Did we ever get to an updated EQ mod that can be replicated for DIY?

 on: June 20, 2018, 12:04:39 AM 
Started by cjmnash - Last post by Berwyn636
Thanks Chris!

 on: June 19, 2018, 10:53:32 AM 
Started by cjmnash - Last post by cjmnash
Mara Machines just launched MaraTapeCal, a tape machine alignment app for iOS.

It'll work with any tape machine, but is geared for MCI machines- and even has a specific alignment path for JH110 owners!

You can search the app store for MaraTapeCal, or follow this link:



 on: June 19, 2018, 10:31:30 AM 
Started by cjmnash - Last post by cjmnash

it'll work with any tape machine.  don't select JH110 unless you have a JH110.

 on: June 16, 2018, 08:23:13 PM 
Started by cjmnash - Last post by Berwyn636

So this will work for an Ampex 440 B? Just set it to JH 110 1/4"??

 on: June 16, 2018, 10:40:27 AM 
Started by cjmnash - Last post by cjmnash
hello everyone!

Mara Machines just launched a Tape Machine Calibration app for iOS.  It's a step-by-step guide complete with photos that will work with any tape machine, but is geared for MCI owners.
The app asks a few questions about tape speed, MRL level and tape used, then does the math for bias level and elevation level.  

Download the app here https://itunes.apple.com/us/app/maratapecal/id1397567357?ls=1&mt=8

or search "MaraTapeCal" from your iOS device.


Chris Mara

 on: May 31, 2018, 01:05:59 PM 
Started by Quint - Last post by stageleft
Check out this link ...


It was copy/pasted from this site ...

 on: May 30, 2018, 02:07:16 PM 
Started by TonesOnTail - Last post by W1DAN

I remember something about it. The person posting stated he was able to get more signal on tape by reducing a series resistor feeding the record head. I do not know what tape he was using, or the reference flux.

As the JH110B/C has good record power to feed hotter +9dB tapes such as Ampex 499, I am not sure this modification is necessary.


 on: May 27, 2018, 02:22:40 PM 
Started by Quint - Last post by Quint
Is there anyone here who remembers how to do the mod to the 400 series that involves something really simple like cutting a resistor leg and then running a wire from one spot to another?  If sort of took the in-line switching capabilities away, but it was supposed to improve the sound.

The thread is obviously gone now, but it is something I'm still interested in trying.

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