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New Final Tubes.. How to Neutralize?

 

Good day FT101ers...? I have a FT-101EE that is due for Final replacements as I only can get 40W out of the rig right now and I got myself a pair of 6JS6C Tubes that were tested in a tube checker to be 95% good life.

Im reading the service manual page 4-12 were it talks about the neutralization, and get conflicting videos on youtube on how to perform this procedure.? ?In One it has the use of an oscilloscope (which I don't have) and the second one using a second radio (Which I also don't have)?

Has anyone experienced problems using the method from the service manual, or has perhaps recorded a video of a neutralization effort per manual on youtube?

Thanks
 

Jose,

I prefer the " cold neutralization " method by removing the ACC plug in the back to remove the heaters from the finals. Do you have a multimeter and a RF probe? If you don't have a probe, do you have a diode? You can measure the RF voltage at the antenna connector with a diode in series with the multimeter on DC volts. It is best to have a dummy load on the rig, not because you will be transmitting, just so it is terminated by 50 ohms during the neutralization. This method doesn't risk your finals and I have found it to work well.?

73 Don ve3ids?



On Tue., Mar. 28, 2023, 2:21 p.m. Jose - KK7HSA, <palazuelos@...> wrote:
Good day FT101ers...? I have a FT-101EE that is due for Final replacements as I only can get 40W out of the rig right now and I got myself a pair of 6JS6C Tubes that were tested in a tube checker to be 95% good life.

Im reading the service manual page 4-12 were it talks about the neutralization, and get conflicting videos on youtube on how to perform this procedure.? ?In One it has the use of an oscilloscope (which I don't have) and the second one using a second radio (Which I also don't have)?

Has anyone experienced problems using the method from the service manual, or has perhaps recorded a video of a neutralization effort per manual on youtube?

Thanks

 

I used both methods (hot and cold) and prefer the 'cold' method.
If you don't have a scope or just a simple AM radio to monitor RF output then a Germanium diode terminated with a resistor would do the trick.

Have a look here for the circuitry.?








On Tue, 28 Mar 2023, 20:17 Don VE3IDS, <ve3ids.don@...> wrote:
Jose,

I prefer the " cold neutralization " method by removing the ACC plug in the back to remove the heaters from the finals. Do you have a multimeter and a RF probe? If you don't have a probe, do you have a diode? You can measure the RF voltage at the antenna connector with a diode in series with the multimeter on DC volts. It is best to have a dummy load on the rig, not because you will be transmitting, just so it is terminated by 50 ohms during the neutralization. This method doesn't risk your finals and I have found it to work well.?

73 Don ve3ids?



On Tue., Mar. 28, 2023, 2:21 p.m. Jose - KK7HSA, <palazuelos@...> wrote:
Good day FT101ers...? I have a FT-101EE that is due for Final replacements as I only can get 40W out of the rig right now and I got myself a pair of 6JS6C Tubes that were tested in a tube checker to be 95% good life.

Im reading the service manual page 4-12 were it talks about the neutralization, and get conflicting videos on youtube on how to perform this procedure.? ?In One it has the use of an oscilloscope (which I don't have) and the second one using a second radio (Which I also don't have)?

Has anyone experienced problems using the method from the service manual, or has perhaps recorded a video of a neutralization effort per manual on youtube?

Thanks

 

Awesome advice. I do have a Multimeter and a Dummy load to connect the output.? ? ? ? ?Wondering about the AM RAdio usage, as I have of course a Car AM , but I would presume I need an in frequency AM Radio receiver.?

I guess I'll try the cold method, with the removal of the ACC Plug as I'm inexperienced and don't want to spend 120 USD to get new tubes.
 

Also an SDR receiver / dongle would work great. Can be bought for little money


On Wed, 29 Mar 2023, 00:32 Jose - KK7HSA, <palazuelos@...> wrote:
Awesome advice. I do have a Multimeter and a Dummy load to connect the output.? ? ? ? ?Wondering about the AM RAdio usage, as I have of course a Car AM , but I would presume I need an in frequency AM Radio receiver.?

I guess I'll try the cold method, with the removal of the ACC Plug as I'm inexperienced and don't want to spend 120 USD to get new tubes.

 

Now That! I Do have.. forgot about it...? ?Thanks for the tip!

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