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It is a fact that on the TR7 a minimum of audio is heard when the AF control is turned fully down. On my SPR-4 the minimum level of audio is more than just acceptable, so I wonder if there is a remedy

I've done some additional wire tracing and I believe I may have found the overheated resistor on the TR3 schematic. From my wire tracing in the TR3, Pin 11 on the rear power connector is the +250VDC

I've seen this in the TR-4 manual but I don't think I've ever seen one: https://www.ebay.com/itm/314218762222 Thanks, Barry - N4BUQ

OK... thanks for the info. I haven't found that information yet. I'll try again to get the power supply board out. I haven't had much luck pulling it out. I know you pull it straight up but it

Hi everyone. I am reporting to you because you offered such good advice. I have found the problem and fixed it but I am embarrassed to disclose that it was the relay. I had cleaned it thoroughly (I

Which part are you asking is normal? The oscillator is free running, so yes it is normal to drift a bit. However it is NOT normal for you to be able to hear it in the RX. That is a symptom of failing

I'm working on bringing a Drake TR3 back to life. During power up I noticed smoke coming from below the chassis. I quickly powered the TR3 off. I turned the TR3 upside down, front panel facing me,

Fellow Drake Enthusiasts, The D-104 Final Edition microphone and the Shure 450 version II have been spoken for from the list I posted on the reflector and the QTH.com ad. ?The other items are still

My R7 is working well, it seems. I am now running it on DC voltage. The multi-vibrator runs at about 28khz after it has been running for a while. It starts at about 24 khz when the R7 is first

Found this on zerobeat under Drake Mods by VE3EFJ: * 8.05 MHz Osc Won't Net This oscillator is varicap controlled and is used in conjunction with the 13.995 fixed oscillator to develop the BFO. In

If the rig did not turn on you were either on the wrong pin or you had a poor connection. The TR7 is a top notch rig and will run circles around many "modern" radios. They are well worth repairing.

I think I verified that as well a few weeks ago. Thanks for the confirmation. Barry - N4BUQ

Barry: Per Garey's *schematics*, I see V-11 changing at #26,000 to a 12BZ6....so yours would agree with that change. 73 Peter VE7PS [email protected]> wrote:

The serial number for my TR-4 is 26040 which is presumably a Version 3 rig. According to Garey's TR-4 documentation, V11 switched from a 12BA6 to a 12BZ6 at Version 4 (S/N 27000) but my TR-4's V11 is

The main time I will suspect alignment is if a PO tried to align it to try and repair it. Steve Wedge, W1ES Time flies like an arrow. Fruit flies like a banana. Sent with [Proton

Cleaned it once. May try one last time. Steve Wedge, W1ES Time flies like an arrow. Fruit flies like a banana. Sent with [Proton Mail](https://proton.me/mail/home) secure email.

Radios typically don't just fall out of alignment so it makes sense that an alignment might not be necessary unless something weird happens. I'm almost certain I had better output - at least on the

Steve: Have you tried cleaning the bandswitch? Barry: I was not certain whether or not the radio ever worked properly for you. If a radio worked well, then failed, it would be highly unlikely for

I have at least one intermittent component, in addition to 15/10 deafness/low power out. I found some sensitivity when moving the "tower" under the 6EJ7. Resoldered everything around it and measured

Hi Gary, If there are problems with the radio, I'm curious why the recommendation is not to align it. I realize that it's easy to misalign it but if the procedures in the manual are followed, then