Making a 6J5 / 6CG7 tube stereo preamp

How to make a tube linestage - Fabrication of a custom chassis and wiring a 6J5 / 6CG7 tube stereo preamp (aka Linestage) This is to match a previously built EL84 SE amp. Basic design of a Voltage Amplifier direct coupled to a Cathode Follower.

Specs:
Two: 6J5 tube (one per channel)
One: 6CG7 tube (twin triode, each triode is dedicated for each channel)
One: 190-0-190 75ma power transformer (Hammond 269EX)

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The circuit shown is a mixture of topologies that I have built over the years. It is not unique and few will notice similarities between various circuits posted in tube literature and various DIY Forum/Communities. I do not assume any ownership of this design. This is posted for hobby use only. Feel free to copy, adjust and modify.

Schematic: https://drive.google.com/file/d/1Vt2jYXdyuiFgZgwfpHYMTLdNUelQ03s5/view?usp=sharing

Part list: https://drive.google.com/file/d/1V2m0My86dP39vT-lYrBjFyV6pzqQ084b/view?usp=sharing

Build Pictures: https://drive.google.com/file/d/1ZQPu50psnK6w9TbF98AFi73S5jueaCxv/view?usp=sharing

Input padding info: https://www.goldpt.com/preattenuation.html

Hakko Solder Station: https://amzn.to/3PvQaD7
Kester Solder: https://amzn.to/3aJKNBI
Digital AC Voltmeter: https://amzn.to/3UewrgY
Valve Amplifiers - Morgan Jones - https://amzn.to/43wQjNc


WARNING: Tube amplifiers contain very high and potentially lethal voltages! Drain all filter caps and check voltages before commencing work.

Discharge tool: https://youtu.be/KkBxXtCThNg
Light Bulb Current Sink: https://youtu.be/v66dY6djBlk


Disclaimer: Some of these links are affiliated where I’ll earn a small commission if you make a purchase at no additional cost to you.

0:00 Intro
3:30 Chassis
6:19 Wiring
10:52 Testing
15:20 Layout

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