![]() ![]() His OPT was also the smaller one with 1.5" stack. The one on the outside was a blue Daly - and was a single 32uF.ħ.The feedback resistor was a 47K of unknown origin.Ĩ.His power transformer was the smaller one of that era. capģ.His second stage 820 ohm (which also measured a little over 1K, was also bypassed with the exact same type 330uF blue colored cap that was on the first cathode resistor.Ĥ.The filtering caps for the middle of the board were gray colored RS caps that had dual 16uF values.ĥ.The screens were 2 blue caps in series (DALY 32uF's).Ħ.The voltage doubler were two big blue caps (100uF DALY's). The cap across his 470K was a Murata hollow round 330pF. canĢ.His treble cap was a 250pF Murata flat ceramic one. It was bypassed with a blue 330uF resistor. (3) Plaap (a friend of Peter Van Wheelden who restored Eddie's amp.)Įdwards amp's internal measurements were as follows:ġ.The first 820 ohm resistor (carbon type) measured a little over 1K. ![]() The value of the coupling cap between V1 and V2a.022uF. Rear cap on top of chassis was a royal-blue HUNTS 32uF or 16uF.need to check notes. The voltage doubler were 2 100uF DALY royal-blue caps. The screen filtering was 2 DALY 32uF light-blue caps in series. The filter cap in the center of the board was a dual 16uF gray RS cap. I am pretty sure the feedback resistor was a 47K. Oh, BTW those 820 ohm resistors were carbon-comp and drifted in value up about 1.1K and make the amp much more gainy and warmer, since these re-bias the 12AX7 valves in a bit more non-linear region. and this my friends is how the "brown sound" with that added compression happens. The real kicker, his phase-inverter "get-rid-of-the-FIZZIES" cap was a 100pF instead of the normal 47pF. If memory serves me right on the value, or it was a 330pF.I will check my notes. One of the 470K mixer resistors was bypassed with a round hollow tubular MURATA cap 500pF. His treble cap was a round shaped ceramic that was a 250pF that said MURATA. His head was a 67/68 and he had the first stage valve with BOTH cathodes tied together sharing the same 820 ohm resistor that was bypassed with a 330uF blue cap. The post that is pressed in looks stock too witch tells me more than anyone could.In the pics the serial # is 12301. From the circuit card It looks like it came stock with this arrangement. its a 2.7k/.68 and the resistor looks like the stock part(but I don't think it is)but the cap is one of those yellow square type from the 70' Marshall's. I do have pic's so I CAN physically see that the amp has a split cathode arrangement. There ARE small tone altering and/or gain altering mods. (1) By Mark Cameron by pictures taken in the early 80'S. ![]()
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