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+10R is provided by Q307 on the transmit exciter board. Sounds like you probably have a bad transistor or other problems on the transmit exciter board. If you want to get rid of it, you can send it to

Hi everyone,sad news. I traced the issue,finally, no 10R getting to the filter board, not even on the socket. Checked the 10R on the psu board, exactly 10.0v Removed The front panel and the two banks

Thanks Rob and Steve; I'll put this behavior down as "normal" -- Craig/W8CS Greenville, SC

I couldn't find the relay in Garey's BOM for the T-4XC. I have found the listing of the original relay in the TR-4C -- it is a P&B R10-E1-Y4-V2.5K I can't see why they shouldn't be the same. The

I never got that far but I have learned to avoid "off" tuning positions with the RF TUNE control. Some of the rigs are more sensitive than others. Steve Wedge, W1ES Time flies like an arrow.? Fruit

I think I found the cause of the watt/SWR meter not working is.? Somebody in the past soldered a white wire from the ground terminal of R2001 directly to ground bypassing C2001 which is supposed to

I have been using a DD-103 digital dial on my R4C to operate in transcieve mode with my T4XB for a number of years.? Works great.? I really like the digital frequency readout.Just be sure to set the

Hi Craig, What you are observing all has to do with mixer injection levels and the source of 5645 kHz local oscillator (LO). The 100 Hz shift is occurring on SSB when the T-4XC is turned on. The 5645

When there are spurious oscillations in the PA tubes, is there a particular frequency this usually occurs? In other words, does changing bands change the frequency of the oscillation? I'm just

That's what I meant to say. Was sitting at the lunch counter with my phone. That's my obvious first check when something like this happens, because that switch won't affect the receiver unless the TX

The "Transceive" switch on the T-4XC is set to "rcvr" -- Craig/W8CS Greenville, SC

Is your receiver function set to RCVR? Steve Wedge, W1ES Time flies like an arrow. Fruit flies like a banana. Sent from [Proton Mail](https://proton.me/mail/home) for iOS

The GE tubes are equivalent to the Sylvanias. No problems. Steve Wedge, W1ES Time flies like an arrow. Fruit flies like a banana. Sent with [Proton Mail](https://proton.me/mail/home) secure email.

This weekend I should be able to figure it out because I have off on Saturday and Sunday. I will try to share with the group of what I find. Mark

This one has GE tubes. Not sure if those are considered the "good" ones (like the Sylvanias) or if they need more capacitance. Hopefully I'll get to the neutralization adjustment today or tomorrow.

Isould have my TR-4Cw RIT open next week. If you still need the info then I can get it and post here. Steve Wedge, W1ES Time flies like an arrow. Fruit flies like a banana.

IIRC, you need a slightly higher value parallel cap with RCA tubes. Steve Wedge, W1ES Time flies like an arrow. Fruit flies like a banana.

Not really a big deal but thought I would check in to see if this is common. R-4C tied into T-4XC in normal transceive config. I'll listen around on the R-4C for a while, and I'll turn on the T-4 if I

OK, thanks.? I'm experimenting with one of the I0CG DDS-4 units. In the DDS-4 manual, one of the recommended uses is to run the DDS output to the INJ jack on the T4 transmitter, so that's what got me

I think something else needs to be considered when there is discussion about how long the 6/12JB6 tubes will last is our present times. When a lot of the folks that are regular contributors to this