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128.48.10.90
In Reply to: Some units have a decoupling electrolytic cap on the +48 volts posted by grhughes on March 1, 2006 at 14:51:51:
Hi, Ray:The decision to replace the original Beyer mic trannies with the Jensens in the Ampex MX-10 was based on the recommendation of another recording person I knew years ago and this guy happened to be a stellar talent in his own right.
I used the Ampex MX-10 for a while to record mostly orchestral material and at that time, I used both non-phantom-powered microphones, specifically a pair of Nakamichi CM-700's, or otherwise was hooking up my Milab VIP-50 multi-pattern large diaphragm condensers with an outboarded phantom box made by AKG.
The signal was sent to a ReVox A-77 open reel machine and later on, a DAT recorder.
The results were excellent, but as time went on, I required much more flexibility, including pan pot functionality and more.
I would never sell that Ampex mixer, however, since I did put quite a lot of my own time into the unit trying to improve it.
I also kept the Beyer trannies that were once in it for other projects, which never quite materialized over the years!
Thanks
Richard Links
Berkeley, CA
Follow Ups:
I believe have a much higher turns ratio. Jensen doesn't wind anything much past 1:10 as a bandwidth measure. The Beyer units were tiny so they won't take much level like a line level.
"I take you as you are
And make of you what I will,
Skunk-bear, carcajou, bloodthirsty
Non-survivor.
Lord, let me die but not die out." THE LAST WOLVERINE by James Dickey
Hi, Ray:So, are you suggesting that the original Beyer transformers might possibly offer me MORE gain than the Jensen 115's I installed years ago?
If this is true, all I need to do here is commit two mic inputs to the use of the orignal Beyer transformers and use that pair of inputs for the use of these restored B&O microphones.
I have to tell you that the Jensen transformers on the input stages brought about a much smoother and in my opinion, much more "musical" sound than the original Beyers. My friends who did location recording were the ones who originally made the suggestion of swapping out these Beyers for the Jensens, but that was over twenty years ago, so I did it (and kept the Beyers just in case).
Let me know your thoughts on this. It does make me wonder.
There is no problem for me removing the Jensens and substituting the orignals on the two other channels, since I normally only record two channels with this mixer.
Thanks
Richard Links
Yes, I think the Beyer's have more gain. They also might have some ringing artifacts or tizzy frizzies! You could probably damp them out with a cap and resistor in series across the secondary. You just have to experiment. Ray
"I take you as you are
And make of you what I will,
Skunk-bear, carcajou, bloodthirsty
Non-survivor.
Lord, let me die but not die out." THE LAST WOLVERINE by James Dickey
Thanks, Ray:I'll that in mind!
Rich Links
...the ribbons were cut by plugging them into a phantom powered mixer of unknown origin equipped for Neumann +48 power. The mics were loaned out and when they returned the ribbons were cut. The user said he couldn't use them because they were "dead". I'm just relaying what has happened to me in the past. Somehow, plugging them into the XLR plug caused this. Good luck! I've also experience interferrence using ribbon mics on Sony pro betacam video cameras in mic inputs equipped for their shotgun mics; a popping noise that sounds like a teletype writer at low levels. Ray
"I take you as you are
And make of you what I will,
Skunk-bear, carcajou, bloodthirsty
Non-survivor.
Lord, let me die but not die out." THE LAST WOLVERINE by James Dickey
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