Hope this is in the right section, here is the problem the radio has low modulation the guy i got it from thinks its a tube problem? but i dont know which tube? any info will help. was doing 100% now only around 50% percent modulation. Thanks.
-
You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
johnson viking 1
- Thread starter Number15
- Start date
You will have to find someone with a tube tester or a schematic or service manual . Try CB TRICKS .com . E F JOHNSON made some real good stuff !!! I am still using the radios I bought back in the 70s and they are still working fine!!
Last edited:
How do i know cause i put it on a meter, and other radio operators said that the modulation was weak. Also the original owner told me also. Thanks for the info guys. ((Also i found that the watts is low only 40?))
Last edited:
Being aware of how things 'were done' some 50 years ago, I would really suggest getting a copy of that manual. Along with a couple of spare 4D32's and 807's. It's amazing what that meter on the front of that thing will tell you, and very accurately too if it hasn't been 'diddled' much. It does have some faults which Johnson corrected in the version II model.
Some of the best advice you can get is to think very conservative with it.
- 'Doc
Some of the best advice you can get is to think very conservative with it.
- 'Doc
The manual should be on B.A.M.A.
Additionally
You gots to run the final with at least a certain amount of grid current or the modulation will not happen correctly. Too much grid current and the final will die.
Many seasoned tube enthusiasts will tell you the best tube tester is the circuit said tube runs in. This is especially true for larger tOObs.
google amfone
Additionally
You gots to run the final with at least a certain amount of grid current or the modulation will not happen correctly. Too much grid current and the final will die.
Many seasoned tube enthusiasts will tell you the best tube tester is the circuit said tube runs in. This is especially true for larger tOObs.
google amfone
What kind of microphone are you running??? Early Johnson radios used High impedance mikes, so if you're using a 600 ohm mike, it will give you very low modulation.
- 399
- 399
- No one is chatting at the moment.
