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EJ or J-pot for volume-pedal?
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The Steel Guitar Forum
Pedal Steel Archive
EJ or J-pot for volume-pedal?
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This topic was originally posted in this forum: Pedal Steel |
| Author | Topic: EJ or J-pot for volume-pedal? |
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emil noothout Member Posts: 67 |
posted 30 May 2000 11:46 AM
Recently i read that there is a difference between a (Clarostat)EJ- and J-pot (500k, i forgot the exact type-number), and that only the J-type has the right audio-taper for steelguitar. Any comments? |
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Jack Stoner Sysop Posts: 8119 |
posted 30 May 2000 11:59 AM
What you read in that post is true. There is only ONE model pot that works satisfactory in the volume pedal. There are other "audio" or "logrithmic" type pots but this one particular model is the only one that is used by the volume pedal manufacturers and the only one that gives desired results. Clarostat 500K ohm Type J (JA1N056S504AA) [This message was edited by Jack Stoner on 30 May 2000 at 02:34 PM.] |
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road runner unregistered Posts: 8119 |
posted 30 May 2000 01:04 PM
Right on JACK, I Just Bought two for my Goodrich pedals, for spares, you never know when you need one in a hurry. ------------------ |
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Donny Hinson Member Posts: 9192 |
posted 30 May 2000 08:57 PM
The pot which I use carries the number JA1N200P504AA. This was the standard pot used by Fender. Electrically, it is the same as the one mentioned by Jack. Type-J, one-half meg. audio (or logarithmic) taper, 2-watt hot molded composition. This pot used to be manufactured by AB, Ohmite, and Centralab, but now I believe that Clarostat is the only one still making them. Has anyone priced these lately? |
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B Cole unregistered Posts: 9192 |
posted 30 May 2000 09:31 PM
I ordered 4 from Emmons guitar Co. and I questioned the EJ and they told me the E stands for Emmons I put them in all my pedals and they work the same as far as I can tell and I believe it was Jack Stayhorn I talked to at Emmons |
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John Macy Member Posts: 2290 |
posted 30 May 2000 10:02 PM
My supplier told me the E was for Extended Life, otherwise, same as a J spec wise. |
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Jack Stoner Sysop Posts: 8119 |
posted 31 May 2000 03:59 AM
The one I mentioned is an "extended life" - Military Spec model. That is the ONLY one that is used. The "EJ" model is NOT the military spec model with the special log taper. I'm not saying the "EJ" is not an extended life version, just that there is NO other EXACT replacement for the spefic model pot used in volume pedals. Any other pot you buy will not have the same ratio on the resistance taper. Don't you think the pedal manufacturers would be using something less expensive if it would satisfactorily work?? Look at Goodrich, they went to the 10K model pedal with a buffer amp to get around it. I was talking to George Lewis at his shop in Madison one day and he brought up about the high price of the pots even for him buying them in large bulk quantities, but there was nothing they could do as it was the only one available. |
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B Cole unregistered Posts: 8119 |
posted 31 May 2000 06:44 AM
I guess the next best thing to do is save the Pennys and buy a Hilton then no mo pots |
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ajm Member Posts: 556 |
posted 31 May 2000 07:29 AM
For those who are new to the forum, this topic was covered extensively in another recent posting. Look under the electronics topics, May 3, 2000: "When is a pot shot?" |
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Donny Hinson Member Posts: 9192 |
posted 01 June 2000 08:30 AM
A couple of calls to my distributor have given me the following information... The pot which Jack mentioned JA1N056S504AA is identical in every way to the pot which I mentioned JA1N200P504AA except for the shaft. The former has a short slotted shaft, while the latter has a long plain shaft. Either will work in volume pedals, with the exception being that in some brands of pedals, the longer shaft might have to shortened (a simple matter, with a hacksaw) for clearance. These are both mil-spec pots, which accounts for their high cost (over $20). They are both designed for "extended life". In other words, they are the best money can buy! |
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Jack Stoner Sysop Posts: 8119 |
posted 01 June 2000 10:20 AM
Donny, I'd agree with that. The last part of the p/n indicates the resistance and the taper (504AA). |
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