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Hi Kevin et al.
Thaks for that.
Very interesting about the bootstrapping and the discreet eyelet boards. I've been meaning to experiment with bootstrapping on one of my preamp breadboards at some point.
But I was actually referring to a couple of small discrepencies between the schematics (page 14-6) and the board layouts (14-8 to 14-9) in TUT3 for the Custom Special amplifier.
These are the ones I'd like advice on:
1. On the bias power supply, the cathode of the zener diode is connected to a different point in the schematic compared to the layout. I'm not sure which is most correct.
2. The cathode resistor on the first stage of V2 is 820 Ohms on the schematic but 1k5 Ohms in the layout.
It's also 820 Ohms in the original Traynor layout, but maybe 1k5 was amended in the layout to reduce the gain?
3. In the layout, the mid and bass pots are wired differently than the schematic. I'm pretty sure the schematic version is more correct, but the mid cap value in both the schematic and the layout (47n) for the Custom Special differs from the earlier Bass Master preamp value (22n).
I can play with these, but would be grateful for a suggested starting value for the mid cap.
Regards.
Thaks for that.
Very interesting about the bootstrapping and the discreet eyelet boards. I've been meaning to experiment with bootstrapping on one of my preamp breadboards at some point.
But I was actually referring to a couple of small discrepencies between the schematics (page 14-6) and the board layouts (14-8 to 14-9) in TUT3 for the Custom Special amplifier.
These are the ones I'd like advice on:
1. On the bias power supply, the cathode of the zener diode is connected to a different point in the schematic compared to the layout. I'm not sure which is most correct.
2. The cathode resistor on the first stage of V2 is 820 Ohms on the schematic but 1k5 Ohms in the layout.
It's also 820 Ohms in the original Traynor layout, but maybe 1k5 was amended in the layout to reduce the gain?
3. In the layout, the mid and bass pots are wired differently than the schematic. I'm pretty sure the schematic version is more correct, but the mid cap value in both the schematic and the layout (47n) for the Custom Special differs from the earlier Bass Master preamp value (22n).
I can play with these, but would be grateful for a suggested starting value for the mid cap.
Regards.
