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In Reply to: RE: HK Citation 2 rebuild questions posted by Ping on April 16, 2015 at 18:47:48:
Ping
You have to understand that the variables have changed since these amps were built.For one thing,the music material we listen to today is much more dynamic than in the 1960s.Where 40db dynamic range was the norm,most material today whether it be LPs or CDs runs between 90db and 105db dynamics.
This puts an incredible drain on the power supply under peak dynamic conditions. You also have to understand that rebuilt Macs and Citations are not powering old speakers anymore.Many of the McShaned Macs and Citations are powering modern Electrostatic speakers such as Martin Logan,Quad,and even the planar magnetics such as Magnepans and these speakers require more energy when played above moderate levels.
Even on the efficient speakers of the day,you can no longer depend on stock values because of the garbage on the power lines today from all the digital noise.You will hear that noise come thru with an anemic power supply on quiet passages and it's very irritating.
You have to also understand that these amps are capable of much more than when they were originally made.You aren't changing the circuitry by building a stout and quiet power supply with greater energy and a lower impedance.You are just purifying the wonderful sonic attributes of what is already there.You could keep the original filter cap values if you were using all film caps because they are much faster and much more efficient than an electrolytic of the same value but let face it,there just isn't the room to do that in most cases. Always remember that an amplifier is nothing more than a DC power supply that we modulate with an AC signal.The more we purify the power supply and give it more joules of energy,the happier our amplifiers and speakers will be.The stock value Mac or Citation cannot drive modern speakers in the 87db to 91db range with 95db dynamic material with stock values because on the first heavy transient,you hit the DC rail in a hurry and then you have an inferior sounding amp on your hands.Read this thread and see what I mean.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Edits: 04/18/15 04/18/15
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Follow Ups
- RE: HK Citation 2 rebuild questions - Michael Samra 00:19:07 04/18/15 (2)
- RE: HK Citation 2 rebuild questions - Jim McShane 09:17:30 04/18/15 (1)
- RE: HK Citation 2 rebuild questions - Michael Samra 12:56:13 04/18/15 (0)
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