Audio Gear > Alex (Lexicon)

Lexicon Alex Broken Input Pot replacement & knob

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Keith:
To get true ohm's it should be taken out. Your going to have to take it out to replace anyway. If you find something before I do please keep us posted here. Thanks. I'm going to be meeting with Bob Sellon hopefully in a few weeks, he has allot of info he has to dig through he is going to get to me. As you may know he was an engineer for Lexicon and had a huge part in the development of Jamman and the MPX G2. But I will defiantly have some time during next week to help you if you have not found anything by then.

wattaday:
Hi Keith,

Thanks for the help so far. I did call Lexicon and they were only able to tell me that the Input (first knob), mix and output (second and third knobs) used the following pots 1 - 10KBX2 and
2 -  50KAX2 but could not tell me which one was the input knob. I am leaning towards the 50KAX2 as the number on the pot is 15A50KX2. I found a 50K 16mm single shaft, dual unit from ALPS that looks like it might work P/N RK16312A0BKH. How Can I measure the resistance if the pot is soldered to the board or do I have to de-solder it first? Any thoughts are welcomed.

Keith:
I talked to Bob about it and it is the same one used in Jamman, that part number may not be of any use if the part was custom ordered for Lexicon. I did a search with the part number you gave, it comes up as a cap. You have to find the right pot, it's not as simple as 6 pins and travel of knob. You need to know voltage and resistance range for the pot. I have a Jamman here that I'll check out also I will do some inquiries. To see if something is available that will come close to do the job. If it is a custom part the only way to get an exact replacement you would need to go to a manufacturer and order like 1000 units. I am a bit tied up this week with a huge project, but will have some free time next week to get into this for you. 

wattaday:
Hi Keith,
I opened the unit and the pot is marked 15A50KX2. It is a six pin (2 3-row) through hole with approximatley 3/16" pitch both directions. Any help identinfying a replacement would be greatly appreciated. Thanks

Keith:
Will need to find the specs for that pot. Lexicon does not carry parts for the discontinued line of their products so substitute parts have to be found using the specs of the original part. Most times you can not find exact part and may need to be modified a bit to get it to work with the unit. Most times pots do not come with the knob, but knobs can be found at Radio Shack.

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