a) Those pots you bought are 16 ∗years∗ old :)
b) Log would be a custom order anyway (all of the 1M logs on the '800 are
custom).
c) Let's hope the 248J Spectrols will be OK.
d) 91A Bourns pots have 2 "issues"
#1: the distance from the center of the shaft to the pcb (when mounted) is 1/8"
more than Spectrol. Hence, the MOTM-800 uses 1/8" spacers and all the other
modules use 1/4" spacers.
#2: the diameter of the leads on the 91A Bourns are larger diameter than
Spectrol.
If the 248J turns out not to work, then I will investigate the 51A from Bourns.
Paul S.
----- Original Message -----
From: "Mark" <yahoogroups@...>
To: <motm@yahoogroups.com>
Sent: Saturday, May 26, 2007 9:31 AM
Subject: [motm] Bourns and Spectrol differences??
>
> I was wondering about the difference between the Bourns and Spectrol
> pots and why the MOTM-800, which uses Bourns, would need different
> spacers. What had confused me was that the Bourns pots I had been
> using for diy are a different size that those used for the 800.
>
> The Bourns 50K linear pots I have been using for diy are labeled
> "51AADC20A18 50K MEXICO H9114X" (which I purchased surplus for $2
> each). They have metal bushings and metal shafts. The only issue I
> have with them is that the shafts are a bit short, but they still
> work. My point is that they have 1/2" bodies just like the Spectrol
> 148. The Bourns pots for the 800 have 5/8" bodies. So I'm
> wondering, are 1/2" Bourns pots a possible replacement for 148 pots
> on MOTM PCB's and does Bourns make 1/2" log pots??
>
> It looks as though all of these pots, the 5/8" Bourns, the 1/2"
> Bourns, and the 1/2" Spectrol all have the same lead spacing. I can
> see how the MOTM-800 5/8" body Bourns pots would place the PCB at a
> different height so different spacers would be needed, but I don't
> understand why they wouldn't fit in MOTM PCB's designed for Spectrol
> 148/149.
>
> Could someone please explain this??
>
>
> On 5/22/07, Paul Schreiber put forth:
>> > I'm a bit confused here. Do the Bourns pots fit the holes in the
>> > PCB's originally designed for Spectrol??
>>
>>No. All of the pc boards would need to be redone.
>
>
>
> Yahoo! Groups Links
>
>
>
>