[Harp-L] CR41 feedback

["dzeller@xxxxxxxxxxx" <dzeller@xxxxxxxxxxx>]

Hi Kurt,
Almost always you can reduce Fender amp feedback by preamp tube
substitutions: your one 12AU7 is a step in the right direction. One of
those three is probably the reverb driver and I'm not sure on the Junior
which it is but: I'd suggest you purchase additional tubes:  12AY7
(ElectroHarmonix are OK, NOS Tung Sols are my favorite) and one more 12AU7,
and try various combinations until you find the one you like best: AU/AY/AY
or AU/AU/AY or AU/AT/AY.  Right now, I'd say the 12AX7 is your main problem
in the circuit.
Keep the treble backed way off ie 0 to 3.
Zig


Subject: [Harp-L] CR41 feedback situation 
To: harp-l@xxxxxxxxxx 
Message-ID: <60.5444b8bb.2f9dae71@xxxxxxx> 
Content-Type: text/plain; charset="US-ASCII" 

Hi, 
I've been surfing around this harp l archive for a couple of months, ... 
waauw ... what a wealth of information at the click of a button... . A big 
thumbs up for the people who are involved with keeping this wonderfull site
up and 
running :) 

I recently bought a shure green bullet CR41 with 99H86 controlled
reluctance 
elment(R7???) ... some pro's seem to call this one the Holy Grail... 
I get feedback at volume 2 1/2, ... my other green bullet. 520D with CM 
made in Mexico,... no feedback until 5 ?!? 
My amp is a fender reissue blues junior (12" Jensen speaker) with a 
12AU/12AT/12AX tube line up. 

How can I crank up the volume of the CR41 without the feedback nightmare
??? 
More 12Au's ?? pre amp??? or alternate CR41??? 
A big thanks in advance for helping me out... 
Harp on !!!! 
Kurt.

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