User manual

Version History

Version 1.0 and 1.1

[April 1993 to April 1994, serial numbers -001 to 016.] There is no musical or functional

difference between these versions. Version 1.1 used a more convenient value for the

Accent and Normal Decay pots, which simplified the modification a little. In Version 1.0,

I had to use different pots while I waited for the right ones to arrive from Japan. Some of

these machines had the Sweep Speed switch retrofitted. All version 1.x machines had the

Slide Time pot as a trimpot adjustable from the back – which meant it was hardly ever

used. (Alternatively, if it was used a lot, it became hard to adjust because the little slot in

the trimpot would become worn.) They did not have LEDs or the Filter Audio Output

signal. They had a pitch shift problem with longer slide times. They had no Lithium

battery. The front panel was laminated cardboard.

Version 2.0

[July to September 1996, serial numbers 017 to 022.] These were the first six printed

circuit boards of the new design. The face-plate was of temporary cardboard. Apart from

the correction of slide time pitch problems, and the addition of the Sweep Speed switch

and the filter audio output, these sound identical to the previous versions, except for a

problem with oscillation of the filter frequencies. In late 2009, four of these machines still

need to have C14 replaced with a 22uF to correct this problem.

Version 2.1

[September to November 1996, serial numbers 023 to 028.] This is a printed circuit

update – removing a few problems in the 2.0 boards which had to corrected manually.

Version 2.1A

[December 1996 to August 1998, serial numbers 029 to 051.] This is the same printed

circuit as 2.1, but with some changes to components on the board and to the

modifications on the TB-303 main board. These changes almost entirely eliminate

clicking when the Decay pot is anti-clockwise and the Soft Attack pot is clockwise.

Version 2.1B

[February 1999.] This is the same printed circuit as 2.1, but with changes to achieve:

1. The reliable elimination of clicks when Decay is fully anti-clockwise and Soft

Attack is fully clockwise.

2. The new, more sensitive, Filter CV input arrangement. (Still linear, but with

greatly increased sensitivity above 4.2 volts.)

In addition, I used a new label for the back panel of the Devil Fish. A few details of the

modifications were changed, such as replacing a resistor rather than adding one in

parallel, but these changes do not alter the behaviour of the machine.