Posts: 91 Member Since: 24/01/2014


Jun 3 16 8:05 PM

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I tried to simply reply to the existing thread but was informed that I didn't have permission.  Terry, can you please tell those mean folks to let me ask my question?!!!
Is this also an issue with the U67?  I've never re-checked mine.  Always sounds great, but wondering if I should be checking.  thanks!
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Gold Finger

Posts: 387 Member Since:19/02/2012

#3 [url]

Jun 8 16 10:18 PM

Yes, it is also an issue with the U67. The voltage resistance of tube heaters and certain power supply components in most tube mic systems goes down, as these components age or dry up. Consequently, the supply voltage goes up. It is therefore vital for the preservation of any tube mic's tube and capsule, that you:

1. calibrate the supply voltage to the mic/tube that is used with it, when you first power up the mic (after purchase)

2. periodically, but at least once a year, recheck the supply voltages, and, if necessary, have them adjusted by a competent microphone technician.

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