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DIYstompboxes.com  |  DIY Stompboxes  |  Building your own stompbox  |  A Quick note on the Kay Tremolo mod 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: A Quick note on the Kay Tremolo mod  (Read 5657 times)
LucifersTrip
Posts: 2409


^^ Fuzz Skull ^^


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A Quick note on the Kay Tremolo mod
« on: September 17, 2010, 08:14:36 PM »

I built the original  with 2N3391's:



Then I added the depth mod, which does give you some more control:



But, I didn't understand why the 100k depth pot was put in series with the 68K resistor [especially if you want full depth control] so I simply replaced the 68K with the 100K pot...and it's far better. Now instead of the 68k "cutoff", you can drop to 0k and get some much sharper depth, which is excellent !

...just a quick note if you're goin' for this unique tremolo.





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alotawatts
Posts: 11


Re: A Quick note on the Kay Tremolo mod
« Reply #1 on: September 18, 2010, 08:55:49 PM »

Interesting....
I just finished a GGG EA Trem. The depth pot is R13 -
 
http://www.generalguitargadgets.com/pdf/ggg_eat_sc_improved.pdf?phpMyAdmin=4a28f86a515b7883e7bc35a68d4e7b6d&phpMyAdmin=78482479fd7e7fc3768044a841b3e85a
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LucifersTrip
Posts: 2409


^^ Fuzz Skull ^^


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Re: A Quick note on the Kay Tremolo mod
« Reply #2 on: September 18, 2010, 11:14:50 PM »


The EA was one of the others I was planning for the future. What happens when you lower R7 or R19 ?
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always think outside the box
Renegadrian
Posts: 2250


Adriano - Rome Italy


Re: A Quick note on the Kay Tremolo mod
« Reply #3 on: September 19, 2010, 09:09:15 AM »

gotta try this out, thx for reporting!
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Done an' workin'=Too many to mention - Tube addict!
alarm
Posts: 6


Re: A Quick note on the Kay Tremolo mod
« Reply #4 on: February 19, 2012, 01:48:50 AM »

Hi, I am just about to set off building one of these.
Can anyone tell me if the depth mod of replacing the 68k resistor with just a 100k pot turned out to be better than the fixed resistor and pot combination.
Also, would it be possible to add a volume pot to this and if so where? I was thinking a 100k pot wired to the output,the 0.22uF cap and ground.
Thanks for any help
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LucifersTrip
Posts: 2409


^^ Fuzz Skull ^^


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Re: A Quick note on the Kay Tremolo mod
« Reply #5 on: February 19, 2012, 05:39:09 AM »

Hi, I am just about to set off building one of these.
Can anyone tell me if the depth mod of replacing the 68k resistor with just a 100k pot turned out to be better than the fixed resistor and pot combination.
as I wrote above, for me it was much better and gave me more control...obviously. you can put any cutoff you like if you don't want it to hit 0K

Quote
Also, would it be possible to add a volume pot to this and if so where? I was thinking a 100k pot wired to the output,the 0.22uF cap and ground. Thanks for any help

yep, that's where you'd wire it...just like a standard one. experiment with the size.  though, don't think you really need one since there should be little or no increase in volume.

the biggest think to worry about (read other posts about it) is to avoid higher gain transistors or you'll wind up with distortion along with the tremolo. I wouldn't use anything higher than 200 hfe

good luck
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alarm
Posts: 6


Re: A Quick note on the Kay Tremolo mod
« Reply #6 on: February 19, 2012, 07:27:09 AM »

Thanks LT I am working on a vero layout with on board pots. Good to know about transistor type problems, I was going to use bc109 as per Andy Carrells layout as I have some of these but from what you have said these might be too high gain. What type did you or anyone else use with success?
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alarm
Posts: 6


Re: A Quick note on the Kay Tremolo mod
« Reply #7 on: February 19, 2012, 08:25:24 AM »

Ok so iI have finished my layout. Please let me know what you think/ If it should work?

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LucifersTrip
Posts: 2409


^^ Fuzz Skull ^^


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Re: A Quick note on the Kay Tremolo mod
« Reply #8 on: February 19, 2012, 02:41:30 PM »

Thanks LT I am working on a vero layout with on board pots. Good to know about transistor type problems, I was going to use bc109 as per Andy Carrells layout as I have some of these but from what you have said these might be too high gain. What type did you or anyone else use with success?

Seven64, who had the distortion problem
http://www.diystompboxes.com/smfforum/index.php?topic=92902.msg796666#msg796666

...wrote me a while later (I'm sure he wouldn't mind me sharing):
"hey, i found a thread from a while ago where i was asking about distortion in the kay tremolo.  you said you were experiencing the same problems.  just thought i would let you know today i was fussing with it again, and threw in some 2n3904's and now it works like a champ."

I was going to use lower gain ones on my next build. I always have 2N5550 and 2SC1815 laying around.

here are some voltages from an original (note the battery he used is low).
http://www.diystompboxes.com/smfforum/index.php?action=printpage;topic=16759.0
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Seven64
Posts: 477


Re: A Quick note on the Kay Tremolo mod
« Reply #9 on: February 19, 2012, 05:13:30 PM »

confirming that i built the pcb layout with 2n3904's with hfe's around 200-210 and it works pretty well.  it sounds fine with my strat, but on my buddies schecter with semour duncan humbuckers and my esp with active emgs there is a little bit of distortion.  i am sure a simple resistor swap would fix this tho, as with the louder guitars the signal is quite a bit stronger than unity.
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alarm
Posts: 6


Re: A Quick note on the Kay Tremolo mod
« Reply #10 on: February 20, 2012, 02:30:25 AM »

Thanks guys I'll have a go at building the layout that i've put together and let you know how i get on. The only lower gain trans i have are ge AC176's. I'll give them a try and order some lower gain silicon ones.
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Colonel Angus
Posts: 305


Brian M. - Cincinnasty, OH


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Re: A Quick note on the Kay Tremolo mod
« Reply #11 on: April 03, 2012, 02:02:10 PM »

Awesome, thanks! I'm gonna try this mod tonight.
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Why should you not have 90o angles? Do the electrons bunch up in the corners?
deadastronaut
Posts: 8766


Rob H. LONDON


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Re: A Quick note on the Kay Tremolo mod
« Reply #12 on: April 04, 2012, 01:07:08 PM »

@luciferstrip:   i'm doing a layout for the kay tremolo.

a couple of questions,

1:  did you remove the 68k totally...then have the 100k pot from the 2x33k's..?

2: how could i add a speed rate led to it?...

cheers rob. Wink
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LucifersTrip
Posts: 2409


^^ Fuzz Skull ^^


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Re: A Quick note on the Kay Tremolo mod
« Reply #13 on: April 04, 2012, 01:36:46 PM »

@luciferstrip:   i'm doing a layout for the kay tremolo.

a couple of questions,

1:  did you remove the 68k totally...then have the 100k pot from the 2x33k's..?

yes, exactly....

Quote
2: how could i add a speed rate led to it?...

cheers rob. Wink

sorry, didn't try to do that...I rarely work with tremolos, so I would've probably just used the trial and error method, anyway.

...and remember not to use high gain transistors.

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deadastronaut
Posts: 8766


Rob H. LONDON


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Re: A Quick note on the Kay Tremolo mod
« Reply #14 on: April 04, 2012, 04:27:49 PM »

cheers man, i'll trial n error the led too.... Wink
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Colonel Angus
Posts: 305


Brian M. - Cincinnasty, OH


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Re: A Quick note on the Kay Tremolo mod
« Reply #15 on: April 15, 2012, 06:34:14 PM »

I added the depth mod, it is subtle but nice.
 Also I tweaked with the rate knob until I came up with something that is:
usable across almost the whole range,
goes really really fast and
doesn't cut out at the highest setting. Also added Rate LED:

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Why should you not have 90o angles? Do the electrons bunch up in the corners?
deadastronaut
Posts: 8766


Rob H. LONDON


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Re: A Quick note on the Kay Tremolo mod
« Reply #16 on: April 15, 2012, 06:51:20 PM »

cool, nice one brian!... Wink
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LucifersTrip
Posts: 2409


^^ Fuzz Skull ^^


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Re: A Quick note on the Kay Tremolo mod
« Reply #17 on: April 15, 2012, 10:30:49 PM »

I added the depth mod, it is subtle but nice.


...my depth control is not subtle at all
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always think outside the box
Colonel Angus
Posts: 305


Brian M. - Cincinnasty, OH


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Re: A Quick note on the Kay Tremolo mod
« Reply #18 on: April 16, 2012, 06:24:46 AM »

That's odd. You used 100K? I guess I left a resistor where the 68K is but brought it way down to 470R. My depth at min. blends in a bit of clean signal and seems to almost soften the  trem waveform. At full it is nice and square and choppy. I'm pleased with the max depth but more clean on the min end would be nice.
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Why should you not have 90o angles? Do the electrons bunch up in the corners?
deadastronaut
Posts: 8766


Rob H. LONDON


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Re: A Quick note on the Kay Tremolo mod
« Reply #19 on: April 16, 2012, 06:36:20 AM »

@brian so the flashing led comes directly off the 2x33ks to ground then?...by the looks of it...

and you left the 68k there..?

heres what i have...any dodgy bits? Smiley

« Last Edit: April 16, 2012, 06:45:21 AM by deadastronaut » Logged

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