Hey all, longtime lurker here. I have a Ceriatone JM and I've been following Ryan Colgan's YT on how it compares to the TR Sig.
Here's something I noticed about the CJM's power supply line/string. See, the AN layout shows 2k2/22k/2k2 dropping resistors at the power board and CJM had 1k5/22k/2k2. So this for me opened a can of worms as I have been passively wondering why I had higher V1 voltages (177v-180+v) 180+ volts at V4 as well, BUT AT THE SAME TIME have lower 6L6 Plate Voltages (430v+ ish) as well, when AN layout shows 445v ...and Nik and even the others saying it should be more like 450+v thereabouts. ...Also, coincidentally, I'm always annoyed how the amp is not really that snappy or marshmallowy as JM's TR Slow Dancing clip for example. Not happy with headroom at loud as well..(plate voltage?) So I went as far as converting the mains to 100uF (50w amp) as suggested in this thread which helped that snap but you can feel somethings still up and I know the voltages doesn't line up. I know its something about the different values on the dropping string. It's only now after re tubing that I got interested again in investigating, also come Ryan's Fairfield County JM build vlogs. > So here's my forensic sort of analysis, from an everyday builder player standpoint of course: (My goal is to ask the knowledgeable ones if this is a good call or if I'm missing something or if I'm wrong) :
>>> 1.) CJM Plate voltages are lower cause the 1k5 3w lets more voltage to the next dropping stage. 2.) CJM PI resistors are 100k & 110K instead of 120/110 cause of the said effect to the next stage, lowering the voltage back to be consistent. 3.) X5 line(Cer. Layout)/b4 line(AN layout) supplies BOTH V4 & V2 on TR/AN layout. WHERAS in Cer. layout, X5/b4 only supplies V4, which is consistent w/ my observation that my V4 voltages were high. 4.) Then Ceriatone has the X6/b5 line supplying BOTH V1 & V2 which could very well be to compensate for not having that "Fet drag" 220k resistor on power board by the last filter (X6/b5), as mentioned by Ryan in his recent Fairfield Build video. As supplying both v1 & v2 instead of just v1 will attempt to tame the voltage (quite unsuccessfully in my case if my theory is right) as the Fet drag would do in AN layout.
So there. My next question is ; If I change the routing like AN with the power line to v4 is same as v2 , v1 is standalone but with an added FET drag resistor, and if I reverse the Ceriatone values changes to be like AN , parts encircled in blue (attached pic), it will be a cohesive reconfigure to be 100% TR/AN circuit?
I'm guessing the Ceriatone differences in power supply config is to technically make it a different circuit enough as to not be considered copying or violation of copyrights etc?
Cheers,
Nick
TAG theory nick.png
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