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I've looked down in the band switch from the bottom and see a small nut. I can't really see the head. What is the best way to get at it? Top or bottom? What type of tools did you use? Going in from

Joseph Where did you get your fan motor for your Drake L4B? Part numbers and cost? Merry Chirstmas 73”s

ALC overshoot spikes are minimal if ALC is used as intended. ALC is not a speech processing system nor a hard limiter. It is there to catch those occasional higher peaks. Thus the instruction with the

AGC in the Drake amp is developed from the transmitters “input” to the tube(s) When you key the transmitter it doesn’t see the AGC signal until it goes through the comparison circuit then

Nice catch. The 7805 is normally very reliable but they do fail occasionally especially in older gear. I trust you checked for a short on the output. I would think you would still have output power

I think I found the issue. There is a switched +13.6V line from the T/R relay which goes to a 7805 regulator on the power amp board. I get switched +13.6V in from the relay to the input of that

Thank you everybody for the info. I will definitely check and use the information in the manual. Also scored the speech processor today also. Merry Christmas and 73. Tony N5DIM

Jim Thanks for that tip as I found that the 5 volt 7805 regulator was dead on the side wall by the power supply.. Installed a new one and things are working now even the receiver hears signals. I

Some fair points in your statements. Yes all filters will eventually fail, yet many will be doing this outside of the current life expectancy of the users. Mechanical filters fail, crystal filters

Welcome back! Your first check should be the high current 13.6V pin on the PS7 4-pin connector. It powers the PA deck and if there is a problem there you will have no output. Otherwise, a rig that has

Noble is pretty good at answering email and explaining specs. I ordered the set for my "new" R4C...(AM, 3 CW, SSB) still learning and haven't installed the SSB filter yet, but glad I got the CW

Hello all, new to the group. Getting back on the air after a twenty-year hiatus starting a business and raising a family. First order of business is to get the TR-7A back on the air. Remarkably the

I don't see an advantage to that. Adjustable ALC is right there in the amp and you are adjusting it to what is happening at the amp, not to an arbitrary value. "Thomas W9TAB via groups.io"

I have finally gotten my R4-c working and I am considering the IF filter upgrade that Rob used to provide. Is Noble the best source for it and if so do they have the specs for it. If not, can someone

I don't want to pick nits here but the statement that all filters will fail, and it "could be now" is just not setting the expectations properly.? I agree that some filters do fail over time for a

You can also ditch the ALC in the amp and use an adjustable negative low voltage source to the radio. Several simple circuits are out there, some using a 9vdc battery and a potentiometer and others

As a side note, the ALC on the L75 is similar to the L7 and L4B in that it is frequency sensitive. ?Adjusting it for 10-15 meters, for example, will result in overdrive if switching to 80 or 160

Tony, The manual for the L-75 provides all of the information you should need for connecting and operating the TR-7 with the L-75. Refer to connection diagrams and section on "SSB Tuning and

I don't need one at the moment but I'd be willing to get a new 600 Hz filter for my TR-4cW RIT. I actually had one in another rig fail and I was fortunate enough to be able to take it apart and fix it

Hello, He can make almost any filter, however there needs to be enough demand to allow him to acquire materials and put some profit margin into the task!For one two or three units? It wont happen. It