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

From Lorne Hammond
Sent Wed, Sep 5th 2018, 15:08

nice post Sam!

lorne

-----Original Message-----
From: Sam Mims <xxx@xxxxxxx.xxx>=20
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=E2=80=99m looking for an A10K volume pot for a Roland EP-11 (Piano =
Plus 11), and can=E2=80=99t 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=E2=80=99s in pretty decent =
shape, works very well (aside from the volume pot and a couple sound =
selector switches), and I=E2=80=99d rather restore it than scrap it for =
compatible parts.
>
>