Re: [Harp-L] Rauland 2135 for Feedback

[Richard Hunter <turtlehill@xxxxxxxxxxxxx>]

GLENN and DEBBIE WOODHOUSE wrote:

<I've got a vintage Rauland 2135 PA amp that I have been playing with 
<recently.  I like it's tone but am struggling with feedback anywhere 
<past mid-volume.  I've swapped out the 12AX7's with 12AY7's but this 
<didn't help much.

The problem may be the result of the combination of the amp and the mic 
you're using.  Most feedback involves a specific band of frequencies; if 
both the amp and the mic are pushing a particular frequency range very 
hard (like, for example, around 650 Hz, or 3kHz-5kHz, which are 
frequency bands where many tube amps and bullet mics both put out a lot 
of energy), that can result in feedback.

Try a different mic (like a stick vocal mic) and see if the problem 
persists.  Or borrow or buy a 10-band graphic equalizer (guitar pedal EQ 
will work fine) and test each band to see if pulling it back makes the 
feedback go away.  Or record yourself, put the recording into the 
computer, and use a spectrum analyzer like Voxengo's free SPAN plugin to 
see where your output is peaking in terms of frequencies, then use an EQ 
to pull back the output in the peak range.

Regard, Richard Hunter
latest mp3s always at http://broadjam.com/rhunter