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1. [AMPS] L7 Amp Questions (score: 1): Author: hbrown@voicenet.com (Harry Brown); Date: Sat, 23 Sep 2000 15:36:26 -0400; I recently got an L7 Amp with a bad 3-500Z. The tube plate had shifted and shorted to the grid. This caused the RF choke that Drake uses in the grid to ground circuit to go up in smoke. Does anyone k; /archives//html/Amps/2000-09/msg00959.html (8,108 bytes)
2. [AMPS] L7 Amp Questions (score: 1): Author: 2@vc.net (measures); Date: Sat, 23 Sep 2000 14:36:55 -0700; As you know, the choke value is not shown on the diagram. My guess is roughly 1mH. I would replace the chokes with fuses or fusing resistors. Add about 1000pF of grid to ground bypass C to protect t; /archives//html/Amps/2000-09/msg00960.html (8,450 bytes)
3. [AMPS] L7 Amp Questions (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sat, 23 Sep 2000 19:00:09 -0400; I believe that idea came from Bill Orr, as an offshoot from the 30S1 Collins PA. In the 30S1, the control grid (the tube was a tetrode) was grounded through a high impedance for RF. The control grid; /archives//html/Amps/2000-09/msg00961.html (9,066 bytes)
4. [AMPS] L7 Amp Questions (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sat, 23 Sep 2000 19:00:09 -0400; Grid fuses or resistors designed to fuse should be avoided. If there is a HV to grid fault, and the grid path opens, a fuse can allow the grid to rise to anode voltage. That allows the anode voltage; /archives//html/Amps/2000-09/msg00962.html (8,067 bytes)

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