Hello,
      If the pick guard is removed there should be a hole in the rear of the cavity for a wire to go to the bridge grounding the circuit inside the guitar.

Hello,
      First thing the bridge needs to be grounded on your guitar. The amp needs all of the input jacks cleaned.
I have the same amp. It gave me fits until I cleaned all the jacks. The jacks are part of the circuit. When you pull out the plug the jack is supposed to ground.
      You don't have to use the fancy spray cleaners just use non-chlorinated brake cleaner. You can get it at
any auto supply store. Clean the pots at the same time. Good luck.

Hello,
      Is this the part that emulates the tubes. US Patent # 5,434,536 A. I cannot find the schematic up to this point. I do not have a pay pal account so it would have to be a money order delivered by snail mail to buy the one off the web.
      One of the other limitations was that it was terribly expensive to produce, so it may be cost prohibitive to
recreate. I an see tons of resistors and diodes just on the first page of the drawings.

Hello,
      Thank you I am, and have been searching. It seems the amp wasn't on the market for long so details are
sketchy, few and far between. But I will stay on it

Hello,
   I would like to know if anyone is familiar with a PRS HG-70 Harmonic Generator. Would it be possible to make a stand alone Harmonic generator to plug a guitar into, and then into an amp? I know this question is really out
there but I looked just that up (Harmonic Generator) and it seems possible.
   

Hello,
       Thanks to all who commented. I have spliced the tone stack from the LTSpice diagram from R22 to C11
into the original Newcomb diagram between the first half of the 12AX7 plate to the 6AU6 grid. As difficult as
that seemed it seems to have been effective. I was just frantic about the readings because I was not sure
about what would be "good enough'' because 20 volts seemed like a lot to me. Thanks again.

Hello,
      It's the same problem with a Newcomb Pathfinder amp, converting it to a guitar amp. After all the the work
I put into it I only have 80 volts coming out of the 12AX7 to the 6V6. I had just given up on it for a while.

Hello,
       I should have known it would turn into a rubics cube. I just wanted to know if a voltage of say 230 volts
going into of 1/2 of a 12AX7 thru a 270K resistor to a 6V6 tube and the resistor steps it down to 80 volts, how do I bring it up to 100 volts ? Is there a simple formula that would give me a value of resistance that could increase voltage 20 volts ?

Hello,
       Looking at Ohm's Law I cannot understand how to calculate a given voltage and stepping it down to
a desired voltage. Is there a formula to calculate the amount of resistance needed to get from ?Volts to ?volts

Hello,
     How can I tell the difference between a 56K resistor as opposed to a 560K resistor by color code? It seems that both are the same.

Hello,
      THANK YOU. You have explained more now than I have been able to glean from any of the 56 previous posts. That brings it all together. I could not understand how to find the amperage carried forward from one resistor to the next. All of the calculations I made on the calculator didn't come up with any useful answers.
       Now I can go back over the numbers and it will make more sense. Thanks again.

Hello,
      Thank you that really helps a lot explaining how to derive the calculations. I have made all of the modifications and all of the readings are pretty close as the transformer does not put out the same amount of volts as the LTSice drawing. I am going by the Newcomb schematic for the incoming voltage and resistor readings between C2 and C3.
       I will open a new thread if I don't get results soon. I am going to take the readings one more time and if it
all checks out I am plugging it in directly to the wall.
       Thanks again sorry to be such a PITA.

Hello,
       It is the Newcomb Pathfinder schematic, being converted using the LTSpice diagram contained in this thread.
       I used a calculator to derive those numbers, but am at a total loss as to what they mean. I divided the voltage into the resistance at each junction in the power supply C2 and C3 then out to the PI side of the 12AX7. of what use they may be I have no idea. I can read the voltage drop across the resistors with my VOM meter. I was trying to find the current, using Ohm's Law. It is all very confusing.
       Thanks for your response.
       

Hello,
      Can someone tell me, after calculating these numbers using Ohm's Law what are they telling me and of what use are they. I just do not know what to be looking for or where to look.
R2-V/284-divided by-.0022=.129090,apparently amperage or current.
R3-V/275-divided by-.056=.001339
Going out to the circuit-V/208-divided by-.027=.007703
       Any help or explanation would be greatly appreciated.

Hello,
      Yes Enzo, I agree with the fact that Ohm's Law is the basis of any project, and am sorting through all of the changes with that in mind. It takes me longer at times because of some of the abbreviations and terms you guys use. It just becomes frustrating trying to do measurements and doing it in the wrong area. Or worse not knowing where to measure what, to find out why or where the problem is.
       I will do the measurements and post them on a drawing from now on to make it clear what I am talking about, that should help everyone involved.
       Thank you for your input, it is encouraging to know I am not just plain stupid, I am just not going about it in the proper order.