Hi DIY'ers
Me and an internet partner are in the middle of making/designing a Grampian 636 without the spring reverb - for pure germanium filth/saturation/distortion, as it was famously used by Pete Townshend. (Eventually I might want to add the spring and make PCBs available)
The Grampian 636 commands extreme prices, so we thought we'd do it ourselves.
Here's what we got so far - schematic. It also has the questions about certain parts of the circuit marked in.
Notice that since this circuit runs on primary -12v, we decided to add a voltage inverter and doubler with a 79L12 voltage regulator.
Here is tons of documentation by Soundgas that themselves made a clone for a whopping 5300 USD
https://soundgas.com/resources/grampian-636-instructions-schematics/Schematic: https://soundgas.com/wp-content/upl...pian-Reverberation-Unit-Type-636-DEST4328.pdf
Technical specs: https://soundgas.com/wp-content/uploads/2019/01/Grampian-Reverberation-Unit-Brochure_p1.pdf
So our main questions are:
- Have we proceeded correctly with cutting the spring reverb? We want as much of the "mojo" of the circuit for the saturation, so the more of it we can include, the better.
- What transformer can we use for the mic pre? And how do we wire the balanced and unbalanced channels of the mic pre?
Me and an internet partner are in the middle of making/designing a Grampian 636 without the spring reverb - for pure germanium filth/saturation/distortion, as it was famously used by Pete Townshend. (Eventually I might want to add the spring and make PCBs available)
The Grampian 636 commands extreme prices, so we thought we'd do it ourselves.
Here's what we got so far - schematic. It also has the questions about certain parts of the circuit marked in.
Notice that since this circuit runs on primary -12v, we decided to add a voltage inverter and doubler with a 79L12 voltage regulator.
Here is tons of documentation by Soundgas that themselves made a clone for a whopping 5300 USD
https://soundgas.com/resources/grampian-636-instructions-schematics/Schematic: https://soundgas.com/wp-content/upl...pian-Reverberation-Unit-Type-636-DEST4328.pdf
Technical specs: https://soundgas.com/wp-content/uploads/2019/01/Grampian-Reverberation-Unit-Brochure_p1.pdf
So our main questions are:
- Have we proceeded correctly with cutting the spring reverb? We want as much of the "mojo" of the circuit for the saturation, so the more of it we can include, the better.
- What transformer can we use for the mic pre? And how do we wire the balanced and unbalanced channels of the mic pre?
