Comments on: Simple 5687-based preamp https://diyparadise.com/w/simple-5687-based-preamp/ ... where we have more fun! ... Mon, 10 May 2021 06:28:51 +0000 hourly 1 https://wordpress.org/?v=6.0.9 By: Charles https://diyparadise.com/w/simple-5687-based-preamp/#comment-1923 Mon, 10 May 2021 06:28:51 +0000 http://127.0.0.1/wordpress63/?p=95#comment-1923 thank you so much! Googling “simple preamp DIY” turned up your page.

]]> By: yeo https://diyparadise.com/w/simple-5687-based-preamp/#comment-403 Tue, 22 Mar 2016 22:08:52 +0000 http://127.0.0.1/wordpress63/?p=95#comment-403 hi sim

well, mu (gain) of 5687 tube is about 20. with resistor loading at the plate, you will get slightly less than that.

i googled common cathode gain calculator, plugged in 10kohm for plate resistor, 2kohm 5687 plate resistance, and mu of 20, i got around 16x for gain.

yeo

]]> By: Sim https://diyparadise.com/w/simple-5687-based-preamp/#comment-400 Tue, 22 Mar 2016 09:03:54 +0000 http://127.0.0.1/wordpress63/?p=95#comment-400 What is the gain for this simple 5687 preamp?

]]> By: Downloads https://diyparadise.com/w/simple-5687-based-preamp/#comment-331 Fri, 29 Mar 2013 06:44:51 +0000 http://127.0.0.1/wordpress63/?p=95#comment-331 […] PPT PDF How to build the Simple 5687 preamp […]

]]> By: How to build YOUR own tube preamp https://diyparadise.com/w/simple-5687-based-preamp/#comment-323 Thu, 28 Mar 2013 11:25:34 +0000 http://127.0.0.1/wordpress63/?p=95#comment-323 […] me show you step-by-step (almost) how I built one. I’m refering to the circuit explained on 5687-based Simple Preamp. Schematics is repeated […]

]]> By: yeo https://diyparadise.com/w/simple-5687-based-preamp/#comment-68 Wed, 20 Jan 2010 21:47:18 +0000 http://127.0.0.1/wordpress63/?p=95#comment-68 well, mu is about 20, but cathode sits at 5v so it shouldn’t be more than 100v. this is a theoretical value.

]]> By: Jeff https://diyparadise.com/w/simple-5687-based-preamp/#comment-67 Sat, 02 Jan 2010 04:24:21 +0000 http://127.0.0.1/wordpress63/?p=95#comment-67 😆 Hi, what is the p-p voltage swing capability of this preamp?

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