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?S=Slow AGC response time M=Medium AGC response time F=Fast AGC response time Fast is only really suitable for use in CW and RTTY. SSB will get quite distorted in the Fast AGC position and less so

Thanks Jim. I'll get them on order from Mouser. I am curious what performance feature about these capacitors requires their use in the AGC circuit. -- Bill N0CU

I recommend these in the proper values: https://www.mouser.com/ProductDetail/598-473MPW630K Please don't order some chinese junk from amazon or ebay. Use these from Mouser or Digikey. 73, Jim W7RY --

They are the two large caps on the AGC board. They are the size of small electrolytic capacitors, but they are not polarized, so I don't know what type they are: C73: 0.22 uF C74: 0.047 uF -- Bill

Any capacitor (especially an old one, even more so where it's in a very hot environment all its life) can easily go bad. What are the values of the capacitors? 73, Jim W7RY

Clean the push buttons for “Fixed XMIT” before you go in to extensive troubleshooting. Best to clean the “FIXED RCVR button and the “AUX Program” rotary switch as well. I think this will fix

I have a TR7 that I picked up at a local hamfest, it came with the matching power supply.? I've gone through the power supply, cleaned it up and tested it.? All is good there.? The TR7 receives but

The receiver seems to work fine when the AGC switch is set to S. However, in the M position there is noticeable distortion on both noise and signals. In the F position, the distortion becomes

Yes, now that I have gone through this, testing of the shunt resistor on an unknown T4 should be one of the first things you do even before you apply power. It should definitely be replaced with a

Thanks, Jim. Yes, I am aware the RV75 will work without the RIT cable but curiosity has the best of me and it appears to be an easy task. Rick K8EZB

Jones plug nomenclature on the web suggests P-3312-CCT. However, you only need this if you actually want to use RIT. The RV75 works just fine without it an honestly I have never missed it because I

I recently acquired an RV75 to use in my 7-line station. The RV75 requires a cable from the RIT SWITCH phono connector on the rear panel to the ACCESSORIES connector on the rear panel of the TR7. This

The Metal Body circular DIN connectors exist, BUT typical hobbyist & radio amateur will *Constantly Complain about PRICE*. These two (2) manufacturers are found through ALL Major Electronics

Doug: Two resistors I ALWAYS check on a new-to-me T-4XC - R49 and R59 on the T/R relay board. One of those is the 3.3 Ohm shunt resistor and the other is in the +250V supply line. Both are easy to

This is NOT a bias issue - read my original message. If anything, the bias is set too low due to an elevated shunt resistor value or opened shunt resistor. I am fairly confident that is the problem

If the plate current is pegged, it is way too much. It is also a good way to go thru your supply of 6JB6 tubes. You need to pull out the book and set the bias. It is the best ally to save the tubes.

If your plate current t is pinning with the drive turned down, you may be losing your bias connection. Clean the blades of the Jones connector with DeOxIt and a Q tip. 73, Steve Wedge, W1ES/4 Time

I am sorry but I can't remember the exact value. It is important mainly in setting the idle bias. Again you can check the current at the 15 ohm cathode resistors.? They tend to go high

OK, did a little further research. I have not checked it yet but the cathode current meter shunt is 2.7 ohms 1/2W. I see a replacement in a WB4HFN slide show uses three parallel 10 ohm 1/2W resistors.

Two sites to bookmark.K4AOH. Order Garry barrell's ca for the C line. Available from his wife. You can download them.? Not expensive.??WB4HFN. Has tons of stuff.Study the metering circuit.? Note