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Hello and thank you Andy for the links.

The sticker on the back shows Feb 07, so I guess 2007.
Only history I can mention is it had an echo board installed that I had taken out.
Also it has a piggy back potentiometer for the swr cal and a talk back volume control that is still installed.

Before I can move forward, I need to know if I am thinking correctly here.

I may be thinking in the opposite direction of the circuit.

With the D8 removed I am not getting any continuity from the Cathode side to the ground of the modulation transformer / foil side . Please see "Pic" within the white circle.

However within the yellow circle in the "Pic" which I am trying to show the Anode side of D8 and the ground of the modulation transformer, I am seeing the 833 ohms.

So if I am thinking correctly "VR 4" is in the other direction, meaning it will not have any affect on the 833 ohms that I am seeing on the other side of D8 the Anode side. (D8 is removed)

Please forgive me if indeed I am thinking backwards here and please correct me.
Also just a reminder the final is removed as well.

Again thank you Andy.

[ATTACH=full]42817[/ATTACH]

<blockquote data-quote="Signal Kicker" data-source="post: 754318" data-attributes="member: 60279">Hello and thank you Andy for the links.The sticker on the back shows Feb 07, so I guess 2007.Only history I can mention is it had an echo board installed that I had taken out.Also it has a piggy back potentiometer for the swr cal and a talk back volume control that is still installed.Before I can move forward, I need to know if I am thinking correctly here. I may be thinking in the opposite direction of the circuit.With the D8 removed I am not getting any continuity from the Cathode side to the ground of the modulation transformer / foil side .&nbsp; Please see &quot;Pic&quot; within the white circle.However within the yellow circle in the &quot;Pic&quot; which I am trying to show the Anode side of D8 and the ground of the modulation transformer, I am seeing the 833 ohms.So if I am thinking correctly &quot;VR 4&quot; is in the other direction, meaning it will not have any affect on the 833 ohms that I am seeing on the other side of D8 the Anode side.&nbsp; (D8 is removed)Please forgive me if indeed I am thinking backwards here and please correct me.Also just a reminder the final is removed as well.Again thank you Andy.[ATTACH=full]42817[/ATTACH]</blockquote>

[QUOTE="Signal Kicker, post: 754318, member: 60279"] Hello and thank you Andy for the links. The sticker on the back shows Feb 07, so I guess 2007. Only history I can mention is it had an echo board installed that I had taken out. Also it has a piggy back potentiometer for the swr cal and a talk back volume control that is still installed. Before I can move forward, I need to know if I am thinking correctly here. I may be thinking in the opposite direction of the circuit. With the D8 removed I am not getting any continuity from the Cathode side to the ground of the modulation transformer / foil side . Please see "Pic" within the white circle. However within the yellow circle in the "Pic" which I am trying to show the Anode side of D8 and the ground of the modulation transformer, I am seeing the 833 ohms. So if I am thinking correctly "VR 4" is in the other direction, meaning it will not have any affect on the 833 ohms that I am seeing on the other side of D8 the Anode side. (D8 is removed) Please forgive me if indeed I am thinking backwards here and please correct me. Also just a reminder the final is removed as well. Again thank you Andy. [ATTACH=full]42817[/ATTACH] [/QUOTE]

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