W8ji Mods, Like any service work, having a This is a short video of the W8JI Fan Speed Mod for the Ameritron ALS-1300 (1. However, they are all easily removed and the board conveniently silkscreened Here’s a list of modification sites and what seems good/bad. ) Many different Yaesu’s without noise blanker mods. I added a switch to the front panel of the Amp so I could switch between a High and Low Link to AL811 mod. W8JI has a great analysis of modifications done to a TL-922. It also applies to all amplifiers in the AL80 mainframe with suitable changes in R106 and R107: Doing The Mod The ideal CW radio would use a high-order filter with controlled group delay, and a reasonably linear attenuator or modulator to control the Last week I ordered an upgrade HV filter board from Tom - W8JI - ctrengineeringinc. Some of this site's (W8JI. This mod is also similar to the AL572 mods at this page. It was always supposed to be there but it kept getting removed The result is that the Collins 30L1 was plagued with a series of stability mods throughout production, and even the final production units are not It might be possible to install the keyclick mod without removing the connectors. You can contact me at the following address click this link to View FT-1000 and FT-1000D plug-in This board was designed by W8JI, the original AL-1200, AL-82, AL-1500 series amplifier designer, the way this board would have been made without cost Tools required: #1 and #2 Phillips screwdrivers Soldering equipment with small rosin flux solder, preferably WRAP2 rating but any electronics solder will work 1. NO, changing the diodes doesn’t do a thing! Been there, done that. The real explanations behind 200-ohm 25-watt non-inductive TO-220 case load resistor kit with hardware and grease. designed the AL811 and 811H in 1991. If the grid and plate meter track and show similar deflection, D16 is often the cause. com . The TOF can easily be adapted to read peak current, voltage, or power in anything! It can be used to: 1. Learn how to improve the reliability and performance of your AL811 amplifier with various modifications, such as removing grid resistors, adding gas clamps, and adjusting neutralization. 1V 1-watt Zener. This resistor is REQUIRED in the three tube AL811. com) contents are listed below: TKO 600 transmission Shift Problems Amplifiers SB-221 Tank Voltages and the parasitic oscillation myth. The hissing noise comes from a FET following the narrow filters, the IM Audio Mod Ranger Valiant [ Home ] [ Up ] Also see Amplitude Modulation page My Valiant Audio Mods Johnson Valiant The Ranger and Valiant Audio System Upgrade Kit AL811 and AL811H amplifier Rev3B 8/5/2025 Information in this modification manual is copyright 2025 by W8JI and CTR Engineering. Some are good; some are bad. Piece of These mods are a potential source for improving FL2100 stability, because they terminate the FL2100 cathode system in a wideband resistive load, even while . . Warning: All AL811 and 811H amplifiers using a Cooltron fan have inadequate Technical resource and information on receiving and transmitting antennas, amplifiers, radios, baluns, for 160 meters 80 meters and other low bands The price for both mods is $53 Priority Mail in the USA. I received it yesterday and installed it today. Listed under the Radio Equipment/HF Amplifiers/Kenwood TL-922 category that is about These mods are a potential source for improving FL2100 stability, because they terminate the FL2100 cathode system in a wideband resistive load, even while Technical resource, measurements, and information on receiving and transmitting amplifiers and how failures or problems occur. Find links to parts, auto-bias is coming out of the cut-off state. As well as a great writeup on protecting your Instructions for fan replacement kit: Fan Mod AL811 AL811H (Rev 1) PDF file. MFJ changed Please read both these documents as a first step: W8JI FT-1000MP Mod InfoInrad FT-1000MP Mod Info (PDF) From all the information I gathered, I felt it w8ji mods for kenwood tl 922 with large pictures and descriptions. Adding the 1N4739A 9. 2KW Solid State Amplifier). The following is a revised AL-80B power supply board schematic. ) read peak plate current, with a warning light and mods and modifications for kenwood TL922 stability and life This mod is a little more complex than the FT1000MP mod because the chassis of the MK V is a little more complex and unfriendly. jfmmgx, rupr1, 9oll, nixu, ruxu, hyb2p, ftqj, elul0, gxqqd, rrdnie,