The D*A*M Super Bee SB-68 was mentioned as something that had not been traced yet, which made me curious. I looked at a few photos and found that there are two versions. One with OC82s and one with OC78s. Some very slight differences, but otherwise, a MKII Tone Bender cramped onto a smaller board to fit the enclosure.
I still haven't been able to spot the value of the electrolytic capacitors on the input and on the Attack pot. These should not make a significant difference to the sound.
If you have any more info or disagree with the values shown, please let me know in the comments. Components with a red outline are assumed based on other TBs.
D*A*M SUPER BEE SB-68 - VERO LAYOUTS
OC82 VERSION
- No 10n cap to ground on Q1 base
- 100k bias resistor on Q2 collector
- 8k2 / 560 ohm bias resistor combo on Q3
- The resistor hiding under the electrolytic near the output cap is most likely the same value as an Italian TB
OC78 VERSION
- 10n cap to ground on Q1 base
- 47k bias resistor on Q2 collector
- 8k2 / 1k bias resistor combo on Q3 collector
- There doesn't appear to be a resistor involved with the attack pot, like on the Italian TBs (none that can be seen anyway)
Just breadboarded the OC82 version and it sounds killer!
ReplyDeleteGood thing that it sounds good with soviet ge's as well which is not often the case since TB2 requires some leakage to sound really good. I guess the collector resistor at Q2(100k) plays a role. Also tried 100k at the base of Q1 (OC81D spec) and it sounds even better.
True - Q1 normally needs a bit of leakage due to the lack of bias resistors on the base.
DeleteI have a few OCs and apart from the 45s, most are pretty leaky.