There are differences between the 1968 UniVibe and the 1969 UniVibe that we all should know and try it out!
Look again at the layout from Turretboard ---> http://www.turretboard.org/wp-content/u ... _names.pdf
The differences are the caps on C13 and C16 are switched the other way around!
EARLY UniVibes (double rubber version) had C13 for 4,7nF, and C16 for 470pF.
The late UniVibes (single rubber version) had C13 for 470pF and C16 for 4,7nF.
EARLY UniVibes (double rubber version) had C6 (-) negative goes to LDR.
The late UniVibes (single rubber version) had C6 (+) positive goes to LDR.
EARLY UniVibes (double rubber version) had C17 (-) negative goes to R32 R33 R34.
The late UniVibes (single rubber version) had C17's polarity orientation the same way like the early UniVibes had it too, BUT most clone builders follow the "915" factory schematic, the RG schematic or the Turretboard layout which they got it WRONG for C17's polarity orientation.
Most EARLY UniVibes (double rubber version) had R37 for 47K but also some early ones from the same year had R37 for 100K.
Most late UniVibes (single rubber version) had R37 for 100K.
Here are the layout of BOTH the 1968 and 1969 UniVibes:
https://imageshack.us/a/img703/2669/uv1968.jpg
https://imageshack.us/a/img22/9903/uv1969.jpg
Note: The ones that use the 10nF and the 6nF for C13 and C16 (which were mentioned by Turretboard as the "Wattson" tracing) they were mistakes made by Shin Ei BUT were made very limited that way.
Keep in mind the 1968 UniVibes were NOT made by Shin Ei, they were made by a company named Honey. Shin Ei took over Honey in 1969 and years later Korg took over Shin Ei. Honey was the original company which first produced UniVibe and put UniVibe on sale in 1967. Unfortunately, Honey went bankrupt in 1969 and Shin Ei became in charge of the production of UniVibe and as a result, UniVibe after 1969 experienced several changes in specification such as the design of logo and the circuit and hence the change in the sound occurred.
Jimi NEVER used the single rubber version UniVibes, Jimi used the double rubber version UniVibes.
Original EARLY UniVibes and late UniVibes differences are...
And for C6, you can see the (+) mark at that cap, meaning that the (-) negative goes to the LDR.
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Finally for C17 you can see how it's oriented. And for R37, yup it is 47K.
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On the older UniVibes, the black stripes indicates as the (+) positive. All three boards are all from 1968, if it has carbon composite resistors, then it is the double rubbber version (1968)