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I have a Hafler DH-110 preamp that needs a new balance pot. From the manual I know I'm looking for a 100K linear taper dual gang pot. Such pots are readily available online. What I don't understand is whether the pins on such pots are all layed out in the same fashion. Are they? If so it's trivial for me to remove the old and solder in the new. If not, it's not so trivial for me. Any advice would be welcome.
Follow Ups:
Balance controls have what is known as a MN taper. They are not easy to source.
A practical solution, if not 100% convenient, is to install a pair of mono log. taper controls.
Eli D.
he would have to get a dual gang type pot with independent movement because the original volume and balance pot are on the same shaft of the 101.
A friend you get for nothing,an enemy has to be bought
Mike,
I think the OP is in a bit of luck. I've uploaded what's supposed to be the DH110's front panel and (very fortunately) there are no concentric knobs.
Perhaps you were thinking of an earlier Hafler SS preamp with "push buttons" on the front.
Let's look at the schematic and "guts" to see if PEC hot molded carbon KA series controls will fit.
Eli D.
I deleted that post when I realized it was a 110.Dual volume controls are the way to go and eliminate the balance pot.
A friend you get for nothing,an enemy has to be bought
I'm not in need of a balance control if a suitable replacement can't be found (at a reasonable price). If I wanted to eliminate it, how would I know what resistor is required? In other words, what's the resistance of the original balance pot at the center point?
Thanks for your advice!
A balance control works by adding resistance to the volume control circuitry of 1 channel and reducing the volume of that channel. In the center/"neutral" position, resistance is not added to either of the 2 channels.
I'm uploading part of the DH-110 schematic. All you need do is short the "hot" terminal of each balance control deck to its corresponding wiper and the deck is out of the signal path. Make certain that you do not short the wipers to the grounded terminals.
Eli D.
it's going to read 50k at the halfway point..If it is log or audio taper,it will read about 10% to 15% of the original value which would be 10k or 15k..If you have the original pot,set it at center of rotation and read from center pin to either side of the pot and that will tell you whether it is log or linear taper..Use the resistor value you measure.If you aren't sure still,I would give Frank VanAlstine a call as he is real nice to talk to and he could answer any questions and he probably has the part you may want. He is the Hafler guru and has does some amazing stuff with Halfer and Dyna.
A friend you get for nothing,an enemy has to be bought
Edits: 05/15/16
Thanks Michael and Eli for the advice. Frank doesn't have the exact pot and doesn't recommend replacing it out of fear of damaging the double sided board. I haven't had trouble in the past replacing pots on the board but maybe I've just been lucky. I'll try cleaning the existing pot a few more times to see if it works again and if not, I'll just remove the balance control from the circuit. Cheers!
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