RE: Magnavox Rebuilds and Fultons (longish)

Posted by JJ Triode (A) on April 7, 2014 at 16:55:16

In Reply to: RE: Magnavox Rebuilds and Fultons (longish) posted by Michael Samra on April 6, 2014 at 15:40:55:

Mike,
Sorry, my RTR/FMI tweeters are not leaving my house until I either die or go deaf. The Fulton version only runs from 5K up but most instruments and voices image at the height of the tweeters.

The 100s run full-range since the lowered position (only few inches off floor) and limited treble dispersion of the Peerless mid-tweeters effectively low-passes the main speakers.

I use RCA 6CG7s in my PP amp for the front end. Not knowing any better, I just followed an old Williamson schematic (I will try to find it for Fitero) with 47K plate and 470R cathode resistor on the first stage, direct coupled first-stage plate to second-stage grid, 22K above and below the second stage. Then second-stage plate and cathode cap-coupled to output tube grids (no third driver stage, unlike Williamson) with 0.1 µF Dynamicaps, 220K to ground. It sounded very nice to me so I have not altered the topology since then (about 2 years ago.) No doubt it could be tweaked more. I only use 4-6 dB of feedback so it is enough gain.

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Follow Ups Full Thread

Topic - Magnavox 9302 Rebuild - Fitero 22:18:10 04/04/14 (24)

RE: Magnavox 9302 Rebuild - johnmil 05:41:28 04/08/14 (1)

RE: Magnavox 9302 Rebuild - Fitero 06:09:24 04/08/14 (0)

Magnavox Rebuilds and Fultons (longish) - JJ Triode 14:48:08 04/05/14 (16)

Fulton Speakers and FMI , website One Day In the Future - drlowmu 11:53:59 04/08/14 (3)

RE: Fulton Speakers and FMI , website One Day In the Future - Fitero 17:11:49 04/08/14 (2)

RE: Fulton Speakers and FMI , website One Day In the Future - drlowmu 08:36:16 04/09/14 (1)

RE: Fulton Speakers and FMI , website One Day In the Future - Fitero 20:31:51 04/09/14 (0)

RE: Magnavox Rebuilds and Fultons (longish) - Michael Samra 15:40:55 04/06/14 (4)

RE: Magnavox Rebuilds and Fultons (longish) - JJ Triode 16:55:16 04/07/14 (0)

RE: Magnavox Rebuilds and Fultons (longish) - Fitero 16:44:44 04/06/14 (2)

Williamson schematic (longish) - JJ Triode 17:22:30 04/07/14 (1)

RE: Williamson schematic (longish) - Fitero 20:37:27 04/07/14 (0)

RE: Magnavox Rebuilds and Fultons (longish) - drlowmu 21:16:22 04/05/14 (2)

RE: Magnavox Rebuilds and Fultons (longish) - Fitero 16:28:58 04/06/14 (1)

RE: Magnavox Rebuilds and Fultons (longish) - drlowmu 19:09:40 04/06/14 (0)

RE: Magnavox Rebuilds and Fultons (longish) - Fitero 19:50:03 04/05/14 (1)

follow-up comments - JJ Triode 22:06:38 04/05/14 (0)

RE: Magnavox Rebuilds and Fultons (longish) - Eli Duttman 16:04:39 04/05/14 (1)

shared cathode resistors - JJ Triode 17:42:17 04/05/14 (0)

RE: Magnavox 9302 Rebuild - drlowmu 01:18:44 04/05/14 (4)

RE: Magnavox 9302 Rebuild - Fitero 06:35:39 04/05/14 (3)

RE: Magnavox 9302 Rebuild - drlowmu 15:25:26 04/05/14 (0)

Good Job Pete - Michael Samra 14:18:51 04/05/14 (1)

RE: +1 - deathtube 667 14:48:31 04/05/14 (0)

Follow Ups

RE: Magnavox Rebuilds and Fultons (longish) - JJ Triode 16:55:16 04/07/14 (0)

RE: Magnavox Rebuilds and Fultons (longish)

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