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Hey, I can't thank both you fellas near enough! I wired her up with a fixed bias and ram the screen grid through the center of the relay and now I can even run a 6L6 which is exactly what I wanted to be able to do switch back and forth between tubes for driver use, working perfectly

Not to mention his great aftermarket boards and products he puts out there for guys like me !!!! I am a big Tram fan and those BA boards he has are the tits ! I run those in every Tram D201 that I have ! The keying relay board is another great addition amongst others

You got that right Shockwave! Thank you Nomadradio!!!! For all you do here !

Yes, thank you Shockwave yeah I think I will go with the fixed -36 bias and put that screen voltage on the center tap of the relay, thank you !

I worked on it a bit more tonight, I guess the deal is that these older JB150 don't like a 6L6 tube as much probably due to that screen grid voltage always being present " I run a 6L6 in the JB150 that has a seeker meter all the time but it's a better setup" I installed a 8417 tube back in the...

I absolutely understand exactly what you are stating here Nomadradio and I may end up changing this box this way myself, as of right now the bias is backwards I think-25 on recieve and -35 on transmit and I actually have two boxes that are this way which was one reason I was getting confused, I...

Indeed the zener was at fault, I got the new ones in and installed them and bingo, I have better negative bias however I am still noticing it trying to cherry the plate a bit in recieve mode I have -25 vdc in recieve and -37 vdc in transmit, is this backwards perhaps since it was once a recieve...

Yes, I have had the zener removed previously and there was -150 on the resistor end, hopefully when that new zener comes in all will be good

I have replaced it since the JB-150 went down as the original one was bad, I have a pack of 10 of then and replaced it again before this post, same results, I ordered a different zener so I will try that next thanks for your help on this Shockwave, we'll see what happens when I get the other one

Shouldn't that zener work though, as long as they gave me right ones, I can't hardly read the print on them even with a magnifying glass

That's a good deal, however I just wired mine up for 6LB6 tubes, less power maybe but cheaper

The zener I have installed was a 1N4753A perhaps this is not the right one ???? It was listed as a 1w 36v zener

That is a brand new zener Shockwave that I installed right before the photo was taken and I haven't had a tube in the unit since I have been repairing it ‍♂️

here is the ground terminal on the rail and I get nothing on it

Here at the pointer in this location I only have -5 vdc at the anode of the zener, the zener is a new 1w 36v zener, is this correct or is the value of the large resistor wrong ? I think this is where the issue lies but why ? I get 23k ohms on that resistor with multimeter

Ok, I am going to try to break it down here and make it easier to understand what I have going on maybe, I disconnected the wire leads and those two resistors coming off the ground terminal and the anode of the zener. I have a -147 vdc here at the pointer

Also, where is this 1w 10k resistor supposed to be that you speak of ???? I have not been going by the schematics since these boxes were made so many different ways I have just been going by what was already in it, I ran it a couple weeks before it went down and worked fine but I know that relay...

I have also previously unsoldered the brown wires from the rail there to make sure there were not shorts farther down the circuit, but from my previous testing I believe they did not have the relay wired correctly from when it use to be a recieve booster probably like you mentioned because...

New but I had the incorrect value of large 2w resistor under the rail there and I changed it to a 22k