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Hoffman Amps Forum image Author Topic: Tremolo questions  (Read 2421 times)

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Offline ALBATROS1234

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Tremolo questions
« on: January 22, 2024, 09:33:09 pm »
So, I am building a National/Valco 1224 Tremotone. At first the amp sounded great but then I built the Trem and with that tube inserted it kind of seemed to bog down the preamp tube. I cathode biased that tube separately which helped some but it is too present. I basically built it like the schematic and this trem only has a speed control. I am just finding the tremolo a bit too overpowering, I have been looking at fender tremolos and such and experimenting to see if I can dial it back but this is my first build with Trem so I am ignorant regarding tweaking it. I tried to add an additional resistor with a decade box between the cathodes but it at certain lower values I hear little or no trem or it makes the faster speeds disappear and the slower is unchanged I assume it is acting like a RC filter. I tried to tap directly into the PI like on a 5E9 Tremolux since they both use a paraphase, using a fixed 220k resistor instead of a 250k pot and 100k to the wiper and I got squat, no trem. Is there a mod to make to whole thing have a less powerful effect/mix on the dry signal with this tremolo. I guess I could switch to a 6SL7 from the 6SF5 I am using and completely rebuild it like a tremolux but I would rather not. Any suggestions on how to make it more subtle it seems too choppy.
« Last Edit: January 22, 2024, 09:38:23 pm by ALBATROS1234 »

Offline sluckey

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Re: Tremolo questions
« Reply #1 on: January 22, 2024, 09:59:45 pm »
You may get some ideas from the Marshall 18 watt amp...

     https://el34world.com/charts/Schematics/files/Marshall/Marshall_18watt_schem.pdf
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Offline PRR

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Re: Tremolo questions
« Reply #2 on: January 23, 2024, 12:33:41 am »
It's the cheapest trem amp in the store (in 1957). It is what it is. You want it? Or you want to come back with another $47 and get the Fender?

Offline ALBATROS1234

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Re: Tremolo questions
« Reply #3 on: January 23, 2024, 07:35:54 am »
I really like the raw grit and harmonic content of this amp with its octal preamp tubes, I just would like to tone down the tremolo mix, there has to be a way. I will take a look at the 18 watt tremolo and see what I can do to make the trem less choppy. Thanks Sluckey.

Offline Brownie

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Re: Tremolo questions
« Reply #4 on: February 08, 2024, 03:39:08 pm »
If you changed to a 6SL7, you could cop the trem circuit in an Ampeg J-12 Jet

 


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