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Thank you, NomadRadio and 543 for the quick reply.

543, that was the answer I was looking for, for my second question. I was hoping that someone would have the value of the resistor that would be used to make the proper adjustment to the output take coil, in the output section, located between the tune and load variable capacitors. I don't want to take the bias class of the Pride DX-300 for granted.

Long story short, I was gifted a bunch of Pride DX 300 parts "literally parts" from a friend of a friend who is now a silent key. For the sake of the hobby and interest in electronics, I have been able to get one put together. The amp is now up and running. I'm at the point of getting the screen light to work and to get the pre-amp section working. Following the the manual on CBTricks has helped a bunch. There's just no info on the tank coil.

NomadRadio, I have been comparing datasheets of the 4cx250 to the 4cx400a, and I have noticed that aside from current rating between the tube, there is little difference in capacitance values on the input and output of the tubes.
Could the 4cx400 be a replacement for the 4cx250b? If not,why?

<blockquote data-quote="7oh7" data-source="post: 673275" data-attributes="member: 42636">Thank you, NomadRadio and 543 for the quick reply.543, that was the answer I was looking for, for my second question. I was hoping that someone would have the value of the resistor that would be used to make the proper adjustment to the output take coil, in the output section, located between the tune and load variable capacitors. I don&#039;t want to take the bias class of the Pride&nbsp; DX-300 for granted.Long story short, I was gifted a bunch of Pride DX 300 parts &quot;literally parts&quot; from a friend of a friend who is now a silent key. For the sake of the hobby and interest in electronics, I have been able to get one put together. The amp is now up and running. I&#039;m at the point of getting the screen light to work and to get the pre-amp section working. Following the the manual on CBTricks has helped a bunch. There&#039;s just no info on the tank coil.NomadRadio, I have been comparing datasheets of the 4cx250 to the 4cx400a, and I have noticed that aside from current rating between the tube, there is little difference in capacitance values on the input and output of the tubes.Could the 4cx400 be a replacement for the 4cx250b? If not,why?</blockquote>

[QUOTE="7oh7, post: 673275, member: 42636"] Thank you, NomadRadio and 543 for the quick reply. 543, that was the answer I was looking for, for my second question. I was hoping that someone would have the value of the resistor that would be used to make the proper adjustment to the output take coil, in the output section, located between the tune and load variable capacitors. I don't want to take the bias class of the Pride DX-300 for granted. Long story short, I was gifted a bunch of Pride DX 300 parts "literally parts" from a friend of a friend who is now a silent key. For the sake of the hobby and interest in electronics, I have been able to get one put together. The amp is now up and running. I'm at the point of getting the screen light to work and to get the pre-amp section working. Following the the manual on CBTricks has helped a bunch. There's just no info on the tank coil. NomadRadio, I have been comparing datasheets of the 4cx250 to the 4cx400a, and I have noticed that aside from current rating between the tube, there is little difference in capacitance values on the input and output of the tubes. Could the 4cx400 be a replacement for the 4cx250b? If not,why? [/QUOTE]

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