Jeongho Park jeongho

Post-Volume Tube Injection: A Distributed Monoblock Architecture

How splitting a passive preamp's output into independent tube-buffered Class D channels solves the home audiophile's fundamental problem

How It Started

I bought a Douk Audio T4+ because it looked good on a desk. Vacuum tube glowing through a metal housing, a VU meter with a bouncing needle, a solid aluminum volume knob — all for under $100. The intended use was simple: DAC into the AUX input, volume knob for level control, headphone output. A compact tube-flavored headphone amp with some visual charm.

The Akashic Record as Hamiltonian Phase Space: A Reinterpretation

With Formal Apparatus

Where the Concept Comes From

The word ākāśa shows up in classical Indian philosophy as one of the five gross elements — the spatial medium through which sound propagates. It's a physical concept in Sāṃkhya and Vedānta, roughly analogous to the Western notion of aether: a substrate, not an information store.

Blavatsky changed this. In the late 19th century, she appropriated ākāśa for Theosophy and repackaged it as something fundamentally different — not a physical medium but an information-theoretic one. The Akashic Record, in her formulation, became a non-physical compendium encoding every event, thought, and intention across all of existence. An append-only universal ledger with perfect recall.

🔗 tinyurl.com/tube-cascade-mod

Multiplicative Tube Harmonic Processing: A Modular Architecture Discovery

How cascading independent tube buffer components creates superior harmonic complexity

The Accidental Discovery

🔗 tinyurl.com/jp-reference-track

Ultimate Audiophile Reference Playlist

A carefully curated collection of 22 reference tracks for evaluating audio equipment, organized by sonic characteristics and musical genres.

Vocals/Jazz

"Spanish Harlem" - Rebecca Pidgeon (The Raven)

Test for: precise vocal imaging, microphone quality

🔗 tinyurl.com/audio-opt-90-10

Audio Optimization Algorithm

How I applied mathematical optimization to solve the audiophile value problem

Note: Pricing as of June 2025

	# haproxy -v
	# HA-Proxy version 2.3.14-83c5b44 2021/09/07 - https://haproxy.org/
	# Status: stable branch - will stop receiving fixes around Q1 2022.
	# Known bugs: http://www.haproxy.org/bugs/bugs-2.3.14.html

	# Self-signed SSL certificate
	# https://gridscale.io/en/community/tutorials/haproxy-ssl/
	# openssl req -nodes -x509 -newkey rsa:2048 -keyout /etc/ssl/private/test.key -out /etc/ssl/private/test.crt -days 3650
	# writing new private key to '/etc/ssl/private/test.key'
	# -----

	--# postgresql 12 high availability cookbook ch14: creating a scalable nextval replacement
	--## this example has 2048 shards (schemas) and 2048 unique values per millisecond (seq % 2048)
	--# ref: [Sharding & IDs at Instagram](https://instagram-engineering.com/sharding-ids-at-instagram-1cf5a71e5a5c)

	CREATE SCHEMA shard;
	CREATE SEQUENCE shard.table_id_seq;

	CREATE OR REPLACE FUNCTION shard.next_unique_id(
	shard_id INT
	)

	#!/usr/bin/env bash
	#sudo apt install uchardet
	#sed -i 's/\r$//' convert_to_utf8.sh
	#bash ./convert_to_utf8.sh ./t3series-common

	[ $# -eq 0 ] && { echo "Usage: bash $0 target_directory (eg. ./t3series-common)"; exit 1; }
	[ ! -d $1 ] && { echo "Directory $1 not exists"; exit 1; }

	pushd "$1"

	#https://stackoverflow.com/questions/59717111/cannot-generate-native-image-using-graalvm-in-os-x-catalina
	sudo xattr -r -d com.apple.quarantine /Library/Java/JavaVirtualMachines/graalvm-ce-java11-20.1.0