aion theseus Instructions Manual - Page 6

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BUILD NOTES

Clipping diodes

The King of Tone uses MA856 diodes, which clip at a slightly higher threshold than standard silicon

diodes such as 1N914 (approximately 0.82V compared to 0.7V). These diodes are long out of production

and have almost entirely disappeared from the old-stock market, likely all bought up by Analogman and

other cloners.

The BA282 and BA283 are very close to the MA856, and were the popular substitute among builders

for awhile... until they dried up too.

Now, the closest option is the BAS33. These clip at around 0.8V, still significantly higher than the 1N914

and only slightly lower than the MA856. We've compared the curves on a Peak DCA75 and confirmed

that they closely match the MA856 across the current test range.

The only problem is that the BAS33 went end-of-life in early 2022. Availability is still high, but

eventually they'll join the ranks of the others.

Omitting the send/return jacks

The loop between the two channels is a modification that is not in the original King of Tone. This loop

automatically shorts together if nothing is plugged in, so it's fully backwards-compatible if you don't use

this feature. However, if you do want to omit it entirely, see the alternate wiring diagram on page 11.

Enclosure size

This project was designed for the Hammond 1590BBS enclosure, which has the same height as the

125B or 1590N1. If you don't use the Hammond brand, be careful—not all 1590BBS enclosures are the

same. For example, Love My Switches sells two different types, and the

CNC Pro

version is correct while

the standard one is too short.

The 1590BB2 seems like a close equivalent, but it's about 4mm shorter. It may be possible to fit this

circuit in a 1590BB2, but we have not tested it, so you're on your own!

Another alternative is the 1590C (also available from Tayda and Love My Switches). It's about 10mm

taller than necessary, but if that's all you can find then it will definitely work.

THESEUS DUAL OVERDRIVE