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  1. OldTech03

    Is there anyone in the Hot Springs Arkansa area that works on cb radios?

    If you remember I did ask you if you had that switch on? Good that is that it was.
  2. OldTech03

    Is there anyone in the Hot Springs Arkansa area that works on cb radios?

    Ok, best I can remember the filament voltage is mostly isolated from the rest of the radio simply meaning there is either a break in the voltage supply or the heater switch is faulty or there is an issue in the AC line plug that connects pin 9 to pin 11 which in turn delivers the 12.6 vac to the...
  3. OldTech03

    Is there anyone in the Hot Springs Arkansa area that works on cb radios?

    I assume the heater switch on the front is on? Just making sure.
  4. OldTech03

    Is there anyone in the Hot Springs Arkansa area that works on cb radios?

    Does it Receive? The reason I ask this is because there should be an accessory plug in the back next to the SO239 antenna plug if it's missing it will not allow the tubes to get filament voltage if the seller is a tech he may have done a cold neutralization adjustment and forgot to put the plug...
  5. OldTech03

    Is there anyone in the Hot Springs Arkansa area that works on cb radios?

    I have worked on hundreds of these over the last 50 years but when you say shipping damage what are the problems physical/electrical or both? I'm in Iowa just for the record.
  6. OldTech03

    Remember when you got a free mobile

    Well, I read through its entirety and really didn't find any factual errors it's pretty straightforward forward I have been repairing since about 1969 and have with maybe a few short years in the commercial field but it seems pretty accurate. Of course, one could argue that there is much more...
  7. OldTech03

    Remember when you got a free mobile

    Citizen Band (CB) radios have played a significant role in communication over the years. These radios, operating in the CB radio spectrum, have been used by people around the world for various purposes. In this essay, we will explore the history, uses, and impact of Citizen Band radios. Citizen...
  8. OldTech03

    CB Tricks site UPDATES/THREAD MERGERS

    I just got on CBTricks seems to be working fine
  9. OldTech03

    Magnum S680 29.090mhz only

    Well, you can't even begin until you reinstate control panel voltages and get the displays working and when you do you may find the radio coming back to life. You may find a bad connection or switch or something but first fix the lights.
  10. OldTech03

    Workman noise filter

    So is the noise the fan or is the noise there when the fan is turned off and then when you turn the fan on high the noise increases? If you have any ground looping in the antenna system or the DC power distribution those will all add to the issue. Now if the alternator is the issue and any of...
  11. OldTech03

    Workman noise filter

    How do you know the alternator is making the noise? Next, it is very hard to control noise being generator by using a long wire with a suppressor that far from the Alternator if there were any chance of doing that it would most likely need to be done at the alternator. I assume the noise you...
  12. OldTech03

    Cleaner Buffer signals on scope...

    Ok I usually only make 1 mistake a year that was 2 mistakes unless I'm counting wrong then it could be 3 mistakes, but in my defense, I don't really care where he is I just remember watching one of his videos after being made aware of his channel and I never went back for more.
  13. OldTech03

    Cleaner Buffer signals on scope...

    There are factors that can cause what you are talking about some of them are simply that the buffer stages in some radios are just dirty IE harmonically and although all IF and mixer stages in low-end radios IE "CBs" can be dirty you will most likely see a lot more of this kind of issue with the...
  14. OldTech03

    COBRA 2000 GTL well I thought I was moving along?

    So it most likely isn't adjusting freq. on any channel?
  15. OldTech03

    Tram D201 40yr/100 Mile Restoration Done Right

    If you use the schematics it will give all you need to know. The cap is in sections that usually have different values of capacitance but in the Tram version, I believe if memory serves me well these are all rated at 40uf @ 450 VDC and that value is specific to the circuits shown on the power...
  16. OldTech03

    Cobra 138XLR Audio Problem ?

    Well, you obviously should spray the volume control and make sure it's clean this radio is an antique, and if it was recapped make sure C79 and C81 are installed in the right direction or polarity just some things you can check.
  17. OldTech03

    Who does quality radio alignment?

    I would say send it in but I have at least a 4 month's backlog and patience would be a very good quality to have. I do try my best to look at all that is here and of course, some units are waiting for parts and others are restorations that take as much as a week or more just the nature of the...
  18. OldTech03

    It may seem a "strange topic" for these parts - CALIBRATION

    Well, I remember in the good ole days when the FCC had certain requirements for a CB to be on frequency now this was before PLL circuits and OCXO'S and TCXO'S were not used in any old tube CB radios and the frequency tolerance was to 20hz one way or the other and the test equipment produced for...
  19. OldTech03

    CB antenna too close to dual band antenna?

    I recently purchased a new F150 love this truck it's the 500HP version it's an all smiles and fast miles anyway I installed both the 2 meter dual bander along with a 2 meter dual band antenna on one side of the pickup it's mounted to a window bracket I made and the 11 meter antenna is mounted on...