Strange EQ plot PULTEC build
The Drip Pultec V2 is an analog equalizer inspired by the classic Pultec EQP-1A design, renowned for its unique ability to boost and cut frequencies simultaneously, which results in a smooth and musical tone shaping. This equalizer employs a passive EQ circuit combined with a vacuum tube gain stage, providing a warm and rich sound that is highly sought after in audio production.
In the context of the observed EQ curves, the expected behavior for the 20 Hz, 60 Hz, and 100 Hz frequencies indicates that the primary signal path is functioning correctly. However, the anomaly at 30 Hz suggests potential issues in the circuit that may include component tolerances, incorrect values, or even a malfunctioning part such as a capacitor or inductor.
When troubleshooting this anomaly, it is essential to examine the circuit schematic closely, focusing on the components associated with the 30 Hz frequency response. This typically involves checking the values and conditions of the inductors and capacitors that define the low-frequency response. Additionally, verifying the integrity of the signal path and ensuring that all connections are secure is critical.
The Pultec-style equalizer uses an inductor-based low-frequency boost circuit, which can be sensitive to component variations. Therefore, it may be necessary to measure the inductance of the coils and the capacitance of the associated capacitors to ensure they meet the specified values. Furthermore, any solder joints or connections that appear compromised should be reflowed or repaired to prevent signal degradation.
In conclusion, while the Drip Pultec V2 exhibits expected behavior at certain frequencies, the anomaly at 30 Hz warrants careful investigation of the circuit components and connections to ensure optimal performance of the equalizer.I just finished a Drip Pultec V2. Checking the EQ curves in spectrafoo I noticed an anomaly. The 20, 60 and 100hz curves appear as expected but the 30.. 🔗 External reference
Related Circuits
A stereo valve phono preamplifier has been constructed by a technician. The device requires a power transformer and various components, excluding the valves, which the technician recommends sourcing based on individual needs. Experienced DIY enthusiasts are invited to share...
This project is designed to assist in a basic course where students create a simple AVR/Arduino-based badge. It serves as a beginner's soldering project, resulting in a small object with blinking lights that can be worn around the neck...
An amplifier is a device that increases the voltage in a circuit. The simplest type is an operational amplifier, and this video will demonstrate how these devices function and how to implement them in electronic applications. As an example,...
A relatively high-power H-bridge motor controller, which is a common method to control DC motors, utilizes inexpensive TIP transistors. A continuous current of 5 Amperes through an H-bridge module may not seem significant to some, depending on their background...
This adaptor will capture plots or prints of your GPIB instrument to your PC through the USB port. It fills the need of anybody who has a test instrument with the GPIB port and likes to get the screen...
This circuit features an intermittent siren output and automatic reset. It can be operated manually using a key switch or a hidden switch, and it can also be wired to activate automatically when the ignition is turned off. By...