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Fading Trem in Kalamazoo

PostPosted: Sat Oct 10, 2009 1:09 am
by goldbrick
Sounds like a song title. Anyway, my early 60's Kalamazoo model 2 amp has the sweetest Temelo you ever heard- but every now and then it just gets real weak-- Think a tube is going ?

Re: Fading Trem in Kalamazoo

PostPosted: Sat Oct 10, 2009 1:53 am
by guitarslim101
The tube is a good place to start. If that doesn't fix it, could be a bad capacitor.

Re: Fading Trem in Kalamazoo

PostPosted: Sat Oct 10, 2009 7:54 pm
by ricochet
There's a reason tubes plug into a socket.

Re: Fading Trem in Kalamazoo

PostPosted: Sat Oct 10, 2009 7:57 pm
by maxx england
They haven't got a screw thread. 8)

Re: Fading Trem in Kalamazoo

PostPosted: Sat Oct 10, 2009 7:58 pm
by ricochet
Some of the early ones did.

Re: Fading Trem in Kalamazoo

PostPosted: Sat Oct 10, 2009 8:21 pm
by maxx england
I bow to the experience of one old enough to remember.

Re: Fading Trem in Kalamazoo

PostPosted: Sat Oct 10, 2009 9:45 pm
by texas blues
ricochet wrote:Some of the early ones did.


Musta' been back in the caveman days. Uhg! Fire good.

Re: Fading Trem in Kalamazoo

PostPosted: Thu Dec 31, 2009 1:18 am
by gheumann
I don't know if you ever solved this - but I rebuild Kalamazoo's for a living. The problem is the 10uFd cap in parallel with a resistor, soldered between the tremelo 12AX7 and the El84 sockets. This cap goes bad, and the symptom is that the tremelo will start and fade out when you turn the effect on. If the cap is all the way bad there will be no tremelo at all. Hope that helps.

Re: Fading Trem in Kalamazoo

PostPosted: Thu Dec 31, 2009 1:29 pm
by birddog
gheumann wrote:I don't know if you ever solved this - but I rebuild Kalamazoo's for a living. The problem is the 10uFd cap in parallel with a resistor, soldered between the tremelo 12AX7 and the El84 sockets. This cap goes bad, and the symptom is that the tremelo will start and fade out when you turn the effect on. If the cap is all the way bad there will be no tremelo at all. Hope that helps.


Thanks for sharing your wisdom in the forums here Greg, you are a gracious professional and some of us really appreciate it.

Have a Great New Year !

Wally

Re: Fading Trem in Kalamazoo

PostPosted: Mon Jan 04, 2010 2:10 am
by goldbrick
Thanks much for the info.

Wish I could find a real amp tech in Miami--guy I asked looked stoned as a box of rocks and had no idea what a Kalamazoo was besides wanting $ 65 just to check it out -Needless to say , I took it home and have been using for a practice amp as it has no other problems


This Kal is box stock but I have another that I play out with that was modified by Blackie Pagano and is one of the best amps I've ever played- the stock amp is a sweet sound all the way but the modified job becomes a real crunchy beast at about 5 on the volume

Al

Re: Fading Trem in Kalamazoo

PostPosted: Mon Jan 04, 2010 2:15 pm
by Lo-Fi
I have a Kalamazoo II and had the same problem - Turned out to be a leaky cap. If it is, best just to go ahead and replace them all.

Re: Fading Trem in Kalamazoo

PostPosted: Mon Jan 04, 2010 3:24 pm
by ricochet
Electrolytic caps all go bad after some years. Most weren't designed to last past 5 years, but some still function acceptably well after 50+ years. It helps if the equipment's used regularly so the aluminum oxide film stays "formed."