Author Topic: Is there anyway to mod the Marvel drive 1 to get more high end?  (Read 246 times)

Esppse

Is there anyway to mod the Marvel drive 1 to get more high end?
« on: February 12, 2019, 09:44:34 PM »
Hello,

I built one of these.

http://1.bp.blogspot.com/-n2aKhSH4Cco/U9462pjPT6I/AAAAAAAAIaw/YQo7yAU0DUQ/s1600/Ramble+FX+Marvel+Drive+horizontal.png

I added a presence control like stated in the comments, but realized that simply removes high end. I need to add a bit more fizz actually, the super high end.

Is there a component I can change to get more top end?

Thanks
« Last Edit: February 13, 2019, 07:33:12 AM by Esppse »

antonis

Re: Is there anyway to mod the Marvel drive 1 to get more high end?
« Reply #1 on: February 13, 2019, 06:56:23 AM »
I added a presence control like stated in the comments,
Due to neither presence control way of addition nor comments are attached, could you plz post a schematic of your specific modification..???  :icon_wink:
(it might be as easy as simply altering presence pot or some neighbour cap value(s)..) 
Can't follow your signature changes, Stephen..!!
but I like what follows:
"put the coffee down, Antonis, and nobody will get hurt."
"Arggg, Jim ...."

Esppse

Re: Is there anyway to mod the Marvel drive 1 to get more high end?
« Reply #2 on: February 13, 2019, 07:32:10 AM »
I did this,

Master 3 on board layout > Presence 3
Presence 3 > Master 3 (pot)
Master 2 > Out

Master 1 to Ground
Presence 1 > added 22n cap > Ground

So basically it's an output tone control for high end roll off.

antonis

Re: Is there anyway to mod the Marvel drive 1 to get more high end?
« Reply #3 on: February 13, 2019, 08:11:30 AM »
Master 3 on board layout > Presence 3
Presence 3 > Master 3 (pot)
Master 2 > Out

Master 1 to Ground
Presence 1 > added 22n cap > Ground

Are you sure that BOTH lugs 3 of Presence & Master are connected together..??

If yes, then you SHOULD have Presence wiper (lug 2) shorted either on lug 3 or lug 1 (wired as variable resistor)
(working as a variable low-pass filter with any impedance exists before Master 3 layout pad ..)

If no, then you should have Presence 2 wired to Master 3 lug (which makes more sense)..

Anyway, WHERE is Presence 2 located..??  :icon_lol:

Last but not least, what's the value of Presence pot..??

P.S.
Shouldn't be more convenient to post a draft schematic rather than every reader trying to draw its own..?? :icon_redface:
« Last Edit: February 13, 2019, 08:27:45 AM by antonis »
Can't follow your signature changes, Stephen..!!
but I like what follows:
"put the coffee down, Antonis, and nobody will get hurt."
"Arggg, Jim ...."

Esppse

Re: Is there anyway to mod the Marvel drive 1 to get more high end?
« Reply #4 on: February 13, 2019, 08:29:36 AM »
Yeah master 3 and presence 3 are not together. Presence 2 goes to master 3.

So board output to presence to master is what I'm doing.

I then removed the presence pot and cap, and made it like the layout 100%, but would like more high end.

Im thinking the 2.2nf cap on the bottom right between Master 3 and Ground on the layout. Should I modify that for a lower value or remove it?

antonis

Re: Is there anyway to mod the Marvel drive 1 to get more high end?
« Reply #5 on: February 14, 2019, 06:37:47 AM »
I'm afraid of we couldn't help you if you don't read (and answer to) entire posts..  :icon_cry:

It should be easy to tell you just to halve 2n2 Cap value to get "more" high end but it should be a fixation without getting into the point..  :icon_wink:

So, I ask you again: What's is the value of Presence pot.??
Can't follow your signature changes, Stephen..!!
but I like what follows:
"put the coffee down, Antonis, and nobody will get hurt."
"Arggg, Jim ...."