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Zen clone resistor sub for voice pot

stax
April 12th, 2011, 08:36 AM
Hi all, just finished a Zen clone using Madbeans Serendipity board, well I say finished, it works and sounds good but I’m waiting on the 10k lin voice pot which I’ve had trouble getting.
Did a bit of research and on average with single coils the voice knob is set to about 2 o clock.
What resistor could I temporally put in so I can use it, I’m guessing a 3k3 or 4k7 would do but thought I’d check with the experts.
Thanks in advance
Stax

Jeff B.
April 12th, 2011, 09:21 AM
Do you have any other pots available? You could put a 3.3K or whatever size in series with a 5K pot or put a resistor in parallel with a higher value pot to divide it down to 10K.

ZenDog
April 12th, 2011, 09:46 AM
Post removed due to unintentional jerk-ass behavior.

stax
April 12th, 2011, 10:11 AM
I'd wait on the pot. My experience would indicate that your findings
are a bit dubious. You might well be disappointed.

So would you mind telling me of your experience and how I might be disappointed, I was only looking for technical help.
Playing a Tele through a Pro reverb and comparing it with several other o/d's I built or modded it sounds great
There is a list somewhere of peoples favorite setting for Zen and as I say on average the voice is normally at 2 oclock.
I bypassed the voice pot to test it and I'm happy enough with that for the time being.
Ordered all the components over a month ago but they made a bit of a hash of it and still waiting for the 10k pot, won't mention any names as they are usually spot on.

11 Gauge
April 12th, 2011, 12:17 PM
Do you have any other pots available? You could put a 3.3K or whatever size in series with a 5K pot or put a resistor in parallel with a higher value pot to divide it down to 10K.

A 5K pot is actually a decent recommendation - I find that part of the range of the 10K isn't very usable, and at "max voice," it's a bit too bright.

2.2K in series with a 5K pot will give you most of the stock 10K/1K range. The other benefit is that at "max voice," you basically have the "2X gain" mod from a TS - a 2.2K resistor paired with a .1uF capacitor.

Keep in mind that if you stick with a higher value fixed resistor that you'll want to match that value on the gain pot.

11 Gauge
April 12th, 2011, 12:28 PM
I bypassed the voice pot to test it and I'm happy enough with that for the time being.

Ordered all the components over a month ago but they made a bit of a hash of it and still waiting for the 10k pot.

2:00, right?

That is easy enough to calculate, for the most part. It's a linear pot, so at noon, it's going to be around 5K. That means that 3/4 is around 2:30, which would be about 2.5K.

...Now add in the 1K resistor in series, and you are at ~3.5K at 2:30. So back it down a touch to 2:00, and you are probably around 3.9K to 4.2K.

Put some resistors in series to get the necessary number.

Another alternative would be to tweak the .1uF cap up or down, too. Add or subtract common sizes in parallel to get where you need to be.

Use this calculator to arrive at your "target high pass filter" frequency:

http://www.muzique.com/schem/filter.htm

...Plugging in a guesstimated 2:00 setting of 3900 ohms at .1uF gives:

~408 Hz

...Push it up to 4200 ohms with .1uF and you get:

~380 Hz

Easy peasy until your 10K pot shows up.

11 Gauge
April 12th, 2011, 01:01 PM
Update - just measured a 10K lin at 2:00, and got right around 3K. This particular pot dialed in to 5K/5K at right around "12:10," if that makes sense. So I tried to compensate for that tolerance variation.

So, with a 1K series resistor, that's right around 4K. String them in series to get close to that (maybe you have a 3.3K and a 680 ohm resistor?). Should be a good starting point. Just tack it in and give it a listen.

ZenDog
April 12th, 2011, 03:36 PM
So would you mind telling me of your experience and how I might be disappointed, I was only looking for technical help.

Okay, never mind. Sorry I bothered you.

stax
April 12th, 2011, 04:07 PM
So, with a 1K series resistor, that's right around 4K. String them in series to get close to that (maybe you have a 3.3K and a 680 ohm resistor?). Should be a good starting point. Just tack it in and give it a listen.

Cheers, I've done that and I'm nipping off to a local jam to have a listen.
Been talking of building one for ages and getting a bit impatient waiting for the pot.

stax
April 12th, 2011, 04:08 PM
Okay, never mind. Sorry I bothered you.

Sorry if I came across a bit harsh mate didn't mean to.
Stax