Re: [AH] Roland parts cross reference/compatibility chart?

From sam
Sent Wed, Sep 5th 2018, 16:32

Yikes, I see that I made a typo...  In the second paragraph, I wrote:

'Most notably, the SH-101 pot is a 10KA, while you need a 100KA.'

In the words of Willy Wonka (rev 1.0, Gene Wilder version), 'Strike that, reverse it!'  That line SHOULD read:

'Most notably, the SH-101 pot is a 100KA, while you need a 10KA.'

Sorry for the confusion!

Sam Mims
Syntaur

  


On 9/5/2018 11:10 AM, DJ Maytag wrote:
> Thanks Sam! Looking at the service manual, it shows 3 legs and 2 side mounting lugs. It appears to be pretty munch identical to the layout of the 101 volume knob. If push came to shove, and I couldn’t find an exact part, would sticking a higher resistance part (i.e. the same one for the SH-101 volume) in it and then reducing the value of R1 (or removing it and putting in a jumper) after the volume pot end up get close to the same output level as using the correct part?
>
> I’ve got a backlog, so I won’t be able to open it up and take pics for a bit. I’m not being lazy, I swear! :D
>
>
>
>
>> On Sep 5, 2018, at 10:16 AM, Lorne Hammond <xxxxxxxx@xxxx.xx> wrote:
>>
>> nice post Sam!
>>
>> lorne
>>
>> -----Original Message-----
>> From: Sam Mims <xxx@xxxxxxx.xxx>
>> Sent: September-05-18 8:08 AM
>> To: DJ Maytag <xxxxxxxx@xxxxxxxx.xxx>; Analog Heaven <xxxxxxxx@xxxxxxxxx.xxx>
>> Subject: Re: [AH] Roland parts cross reference/compatibility chart?
>>
>> Matching parts like this is a tricky game.  I spend a crazy amount of time at it, and have lots of incorrect parts to show for it!  (And thankfully, a decent number of correct ones also...) You can easily get lost in a rabbit hole.
>>
>> You are correct in that the SH-101 pot is from the same supplier - the 'EVH...' part numbers say that they are both Panasonic parts.  But the devil is in the details.  Most notably, the SH-101 pot is a 10KA, while you need a 100KA.  In Panasonic-speak, the 'A14' at the end of the part number designates this - the SH-101 pot ends in 'A15'.
>>
>> And all of those other numbers before it designate things like the type of shaft (knurled, flatted, round?), the length of the shaft, etc., all of which are critical.
>>
>> My mental process in finding a replacement goes something like this:
>>
>> (1) Find pots that are electrically correct - i.e. same resistance and taper.  Theoretically, you can make any of these work, though you may have nothing better than a strange pot dangling by the wires.
>>
>> (2) Narrow your search to those that physically fit - both mounting to the PCB (if applicable), and fitting within the confines of the synth. Do you need a panel-mount or PCB-mount pot, for instance?  Some PCB-mount pots have three solder pins, some have four (the fourth is either a dummy or a center tap). Dual pots may have 6 or 7 pins.
>>
>> (3) Once you find pots that can actually mount in the synth, find the ones with the correct type of shaft.  If your other pots (and hence the
>> knobs) are flatted D-shaft, then you will want a replacement pot with this type of shaft.  If it's a D-shaft, things are further complicated by the orientation of the flat - if this is wrong, once the knob is installed, it may be pointing 180 or 90 degrees out of whack.  And of course, the shaft needs to be the correct length.  Too short won't work, of course, too long can be solved by a cutting wheel.
>>
>> (4) Other considerations include: Solder lugs or PCB pins?  If PCB pins, they need to be oriented correctly.  Do you need a pot with a center detent or not?  If it is a 4-pin pot, do you need a center-tap pot or not?
>>
>> So you can see that it gets pretty complicated!  I often think that what we sell at Syntaur is not so much the part itself, but all of the legwork it takes to figure that part out.  And in a number of cases, when the perfect match is not to be found, we sell a pot that has the shaft already cut to the correct length or something like that.
>>
>> If you like, you can email me a photo of the pot you need, and I can look through our database and perhaps find a good replacement among the 10KA pots we carry.
>>
>> Sam Mims
>>
>> Syntaur
>>
>>
>>
>> On 9/5/2018 8:00 AM, DJ Maytag wrote:
>>> Hey all,
>>>
>>> I’m looking for an A10K volume pot for a Roland EP-11 (Piano Plus 11), and can’t see to find this part used in other Roland gear made in 1982 (closest thing is an A100K used in the SH-101 that appears to be from the same supplier). The Roland part # is 13219240 and the supplier # is EVH-5XAP20A14.
>>>
>>> Any thoughts on where to find this? It’s in pretty decent shape, works very well (aside from the volume pot and a couple sound selector switches), and I’d rather restore it than scrap it for compatible parts.
>>>
>>>