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In Reply to: Re: CAUTION!!!! posted by Marantzguy on March 1, 2006 at 13:39:05:
...if there is not a bleeder resistor acoss this cap then any residual Dc charge in the capacitor might damage a ribbon mic plugged into a plug even with the 48 volts turned off. Also the two 6.8 K phamtom power resistors need to be highly matched to prevent any DC leakage. Don't use carbon film or carbon comp because soldering them will change their value. This 48 volts needs to be from a good linear supply not a switching power supply.
The EF86/6267 made a decent mic preamp but I haven't used one since the late 60s. I don't think you can buy a better transformer than a Jensen. Ray Hughes
"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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Follow Ups
- Some units have a decoupling electrolytic cap on the +48 volts - grhughes 14:51:51 03/01/06 (6)
- Re: Some units have a decoupling electrolytic cap on the +48 volts - Marantzguy 16:04:14 03/01/06 (5)
- The Beyer Transformers... - grhughes 07:42:10 03/02/06 (4)
- Re: The Beyer Transformers... - Marantzguy 13:36:40 03/02/06 (3)
- Re: The Beyer Transformers... - grhughes 14:23:14 03/02/06 (2)
- Re: The Beyer Transformers... - Marantzguy 16:13:14 03/02/06 (1)
- 2 RCA BK11A mics in a studio I worked at were ruined... - grhughes 17:51:56 03/02/06 (0)
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