ADA Preamps > Original MP-1
MOD3 5150
RobbHell:
MJMP Please give me your thoughts on this. Everyone is welcome to chime in as well.
I've been going over a lot of Peavey schematics here are some ideas I have do a pretty good mock up for a 5150 tube stage.
R6 (220k) C15 (1uf) R24(jumper) R25 (1.8k) C10 (.022uf) C11 ( 470pf or 2.2m resistor?) R20,R21 (470k) C14(1uf) R22 (1.8k) C9 (.022uf) R19 (470k) R18 (1M) R15 (39k) C7 (none) C3 (.022uf) C4(jumper) R13 (220k) R14 (330k) then Piggy back a (.001 uf) cap over R14. R2 (220k) R16 (1.8k) C6 (1uf) C5 (.022uf).
R7,R23 (47k) C12,C16 (1uf or .47 uf)
Now that is almost the exact layout for the first four tube stages of the Original 5150 minus its extra gain stages. I think this would be a great revision of MOD3 and give users more of less exactly a 5150 tube board. I'm also thinking of relocating the H wire to the 7th pin of V1b like in the 3.666. The 3.666 is a pretty damn good since we only have four gain stages its a great copy of the first four stages of the Recto minus the leads stages.
Appreciate your feed back and thoughts.
RobbHell:
Does anyone have the specs for the voltage going into the Anode Triode on a 5150? On the Mesa's and Soldano's its very high voltage.
George I.:
--- Quote from: RobbHell on September 12, 2014, 12:36:13 PM ---Does anyone have the specs for the voltage going into the Anode Triode on a 5150? On the Mesa's and Soldano's its very high voltage.
--- End quote ---
my 5150 script logo measures as follows (give or take 10-15 DCvolts depending on whats running in the house, so take it with a +/- 20 or so!)
plate volts at pin 3 of power tube - 495 (i've seen it as high as 515 though)
preamp main tone tubes at the plates measure DC volts as follows:
v1a (first gain stage) 160dc
v1b (second gain stage) 217
v2a -295
v2b - 168
v5a - 248
v5b - 189
i assume you dont need the fx loop or PI tube readings as there wouldnt be any real way to implement these in the ada mp1 mod.
v3 is the effects loop tube
v4 is the phase inverter
RobbHell:
A MDRT would help but yea I noticed in most of the schematics I was reading between Peavey/Mesa/Soldano the plate voltage was usually 215-395+ .
RobbHell:
Would anyone be interested in this? Was hoping for a little more feed back.
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