Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: isaac_teller on March 09, 2022, 01:37:23 am
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Hello. I've built a clone of the Kalamazoo 2. Works great, sounds great. However there is no intensity control. What would I need to do to increase the intensity without adding a knob(fixed intensity level). Thank you.
https://schematicheaven.net/bargainbin/kalamazoo_m2s.pdf
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There may not be any very simple mod because your circuit is already delivering all the tremolo it can. You can try replacing R5 and C13 with a red LED. This will definitely make the tremolo stronger but may not work in your circuit. Easy to try.
You have a spare triode. Look at some circuits like the Supro 6622 (https://el34world.com/charts/Schematics/files/Supro/Supro_s6622.pdf). You can set the strength of the tremolo by changing the value of the 220K grid resistor for V4-7.
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What about increasing the plate resistor to 220k (to get more gain)?
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That sounds like a good idea. I'll try it.
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I doubt "increasing gain" will get you there.
Is this really using 1-1/2 12AX7s?? What could you do with the odd triode? Seems like Fender had some buffered trem drive.
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^^^^
good call, I looked n checked the box that both 1/2's were used, missed that 1st tube :laugh:
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The version I built used a 6AV6 for the tremolo. There's no unused triode. I lowered V1A cathode resistor to 1K5. It sounds better to my ears.
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The version I built used a 6AV6 for the tremolo. There's no unused triode. I lowered V1A cathode resistor to 1K5. It sounds better to my ears.
That kind of info should have been included in your first post.