Kalamazoo clone project

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Kalamazoo clone project

Postby Jaybird803 » Wed Feb 28, 2007 2:49 pm

I have been working on a clone for a Kalamazoo mdel 2 amp. I discovered the amp on another harp site and gave it a try. Tha amp is such a great sounding harp amp that I had to have two, so as I built it I also took some pics, and wrote down a few thoughts, which can be found at this link. http://home.earthlink.net/~olsjm/amps4me/
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Postby jeffl » Wed Feb 28, 2007 3:23 pm

Pretty cool 803. A noble pursuit. Best wishes for success.
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Postby Jaybird803 » Tue Mar 13, 2007 2:17 pm

I finished the project and thought I would post a pic of the amp. The K2 is really a great harp amp.
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http://home.earthlink.net/~olsjm/amps4me/
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Postby jeffl » Tue Mar 13, 2007 2:49 pm

Nice job,Jaybird! I'll bet that was fun. I don't know if you've got kids or not, but somethin' like that would be a great thing to leave 'em when you're gone.
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Postby songdog » Tue Mar 13, 2007 5:47 pm

Looks real nice Jaybird. How bout a sound clip or two?
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Postby ricochet » Tue Mar 13, 2007 11:34 pm

That is a purty thing, Jaybird.
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Postby Jaybird803 » Wed Mar 14, 2007 3:09 am

If I can figure out how to do a sound clip i will post a little taste.
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Postby brianp » Thu Mar 15, 2007 4:08 am

Great work man! I am really impressed.

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http://www.harpgear.com
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Postby pentatone » Thu Mar 15, 2007 3:23 pm

jaybird - this is a nice amp you built, please try to post some soundclips.

I´m in the projecting phase of a small amp, too, and this Kalamazoo seems to be the right one to clone although I think I´ll do without the tremolo so it would rather be a model 1.
Would you please enlighten me concerning two questions?
Did I understand correctly that you substituted the 6BQ5 tube with an EL84?
Where did you get the 6X6 rectifier tube from? I live in Germany and here seems to be no ressource to get one - do you have any idea for a substitute?
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Postby Jaybird803 » Thu Mar 15, 2007 3:34 pm

The 6BQ5 and the EL84 are the same tube, I believe one number is european and the other an American number system. It is a 6X4 rectifier, not 6X6. The 6X4 is readily available online,
http://www.tubesandmore.com/ for around $6. Good luck and have fun.
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Postby pentatone » Thu Mar 15, 2007 4:20 pm

Thanks alot!
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Postby t bone bruce » Thu Mar 15, 2007 9:57 pm

That's a great looking amp. I'm thinking about building another harp amp, seeing things like this doesn't do anything to stop the cravings, it makes them worse.... I'm keen to find out how it sounds too.
The EL84 and 6BQ5 are indeed one and the same.
Pentatone, you might consider using a solid state rectifier instead of the 6X4 rectifier tube. You can use a smaller/lower voltage rated PT then, one with a 200-220V HT secondary, and you won't have the current draw of the rectifier either so about 1.5A 6.3v secondary will do.
Some guys look aghast when I mention SS rectifiers, but these single ended class A amps draw the same current all the time so there is no rectifer sag, unlike the class AB PP amps where it's more important to have a tube rectifier.
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Postby Jaybird803 » Thu Mar 15, 2007 10:47 pm

While researching this amp before building, I went to Miles O,Neal with a question about using a different valur PT. He told me that I was taking a chance on losing the dirty tone thatis so attractive in this amp for harp. Just something to consider. If it ain't broke , why fix?
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Postby ricochet » Fri Mar 16, 2007 12:05 am

t bone bruce wrote:Some guys look aghast when I mention SS rectifiers, but these single ended class A amps draw the same current all the time so there is no rectifier sag, unlike the class AB PP amps where it's more important to have a tube rectifier.

Exactly. Only reason I might use a tube rectifier is that I just like to see tubes glowing, and I have a whole bunch of 'em. The little head I've designed, bought all the parts for and had sitting in a pile since last April (I've got to put it together one of these days) uses solid state rectification for space saving purposes. You'll understand that when I get around to putting it together and post pictures.
:D
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Postby brianp » Fri Mar 16, 2007 11:23 pm

Jaybird does such a great job I just had to have one of these. I have been wanting a K1 or K2 again for some time now. So I bought this one today. I will let you know how it plays when I get it. I will also do some sound samples. Thanks again Jay.

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