HawkeyeKane
254 posts
Oct 07, 2011
1:58 PM
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Okay, so I just got my Kalamazoo Model 2. (Huge thanks to Greg for his skills with these suckers.) I'm liking the depth of tremolo circuit as of right now. But should I want to change it, is there another tube I can put in the slot that'll deepen or shallow it besides your typical 12AX7?
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Hawkeye Kane
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bharper
65 posts
Oct 07, 2011
4:07 PM
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If you install a different value tube the tremolo circuit may cease to work. Try a different tube -- such as a 5751 -- and see.
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HawkeyeKane
291 posts
Oct 18, 2011
12:47 PM
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What about a 12AX7WC?
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Hawkeye Kane
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Greg Heumann
1304 posts
Oct 18, 2011
8:41 PM
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The tremelo circuit in the Kalamazoo is VERY dependent on a match between the tremelo tube and the preamp tube. I've tried other tubes - the circuit just stops working. You can change the DEPTH of the tremelo by changing the C5 capacitor - it is normally 10uFd. Double it to 20uFd and the tremelo will be deeper. Cut it to 5uFd and it will be less pronounced. See http://www.rru.com/~meo/Guitar/Amps/Kalamazoo/M2/schem.html for the schematic.
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/Greg
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HawkeyeKane
294 posts
Oct 19, 2011
8:35 AM
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I gotcha Greg. Grazi.
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Hawkeye Kane
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walterharp
731 posts
Oct 19, 2011
11:17 AM
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you could try different brand 12ax7's that can make a pretty big difference.... sometimes, in some amps, the old expensive nos tubes don't sound as good as the cheapies...
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HawkeyeKane
297 posts
Oct 19, 2011
11:22 AM
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This amp still has its original Raytheons in it. It's the only amp I've ever heard with that brand.
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Hawkeye Kane
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