File:Old dusty DIY tube-mosfet preamp top view.jpg

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Original file (3,525 × 3,078 pixels, file size: 2.38 MB, MIME type: image/jpeg)

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Old dusty DIY tube-mosfet preamp

Summary

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Description
English: I was looking for an amplifier enclosure... and I found THIS. An old tube preamp that I made around 2000. All tubes (both in phono and line stages) are loaded into Gary Pimm battery-biased mosfet current sources.After more than 20 years, some batteries still hold the rated voltage, others are way down but not completely dead. None had leaked. They don't build batteries like this anymore.
The four tubes seen in the bottom are gas regulators fed with CCS's; these power four (missing) triodes of the phono stage, which are loaded to somewhat different CCS's.
Русский: Искал подходящий корпус для усилителя, и нашёл ЭТО. Лампово-полупроводниковый предусилитель, который я собрал около 2000 года, запустил, даже отчасти отладил - но никогда не использовал. Обычные пассивные ламповые схемы, но в нагрузках - источники тока по схеме Гери Пимма (два МДП-транзистора и две батарейки смещения в каждом). По прошествии двадцати лет некоторые батарейки еще держат номинальное напряжение, другие подсели но не сдохди совсем, и ни одной протечки. Умели же делать... но больше не будут.
Date
Source Own work
Author Retired electrician

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I, the copyright holder of this work, hereby publish it under the following license:
Creative Commons CC-Zero This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication.
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current12:27, 9 April 2023Thumbnail for version as of 12:27, 9 April 20233,525 × 3,078 (2.38 MB)Retired electrician (talk | contribs)Uploaded own work with UploadWizard

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