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In Reply to: RE: Recent finds. posted by Michael Samra on April 16, 2016 at 21:39:22
ifin that one in the pic is available please let me know.
Nice score number 762 for you!
"Once this was all Black Plasma and Imagination"-Michael McClure
Follow Ups:
I don't know if this would be a viable option, but there is a nice looking ARC SP9 MKIII Stereo PreAmplifier listed for sale on Craigslist in Detroit (see URL Link). I have nothing to do with the seller. No asking price is listed.
That is my only SP3a and I"m letting Roger use it and I did all the McShane upgrades to it and the Citation 2 underneath along with some of my own.I'll let you know if I ever sell it.The preamp that I really like right now is the Heathkit AA-11.They are very rare but have a nice potted choke in power supply and it uses Baxandall tone control circuit which to me is the only way to do tone controls other than tone switching like the Marantz 7C,the Citation 1, and Mac C22uses.
A friend you get for nothing,an enemy has to be bought
Mike,
Do you have a schematic of the AA-11 you could share? I checked the usual sites and didn't find one. I am curious what makes that circuit special.
Looks like there's one here:
http://www.virhistory.com/hi-fi/chevy.htm
Excellent! Thank you.
I just saw where you asked.
A friend you get for nothing,an enemy has to be bought
I appreciate that. Knowing him though he'll track one down soon.
He (Will Vincent) did some mods on and sold me my SP3A and then replaced
the power supply when it went awol a few years ago. He was wondering if I
wanted to sell it back to him!
Hell no, he did TOO good a job on it.
Told him I'd keep an eye open for one...
"Once this was all Black Plasma and Imagination" -Michael McClure
I did just basics to it for now and I put a few sonicap teflons in along with k40s and solen film and tin foils and then of course the filter caps.
I did lots of stuff underneath but when I finish I can post more pics.
A friend you get for nothing,an enemy has to be bought
Michael, what is "tone switching", and does the 7T use it as well?
rockdoc
RD
Tone switching is where they don't use potentiometers for bass and treble but what they do use is an actual multi-position switch. Across each one of these switch positions,they have a resistor/cap combo,so this more or less couples those parts of circuit as if you had just a single resistor/cap combo like preamps today with no tone controls.This type of circuit is said to greatly reduce or eliminate phase shift that tone controls typically cause.It allows you to increase amplitude of the bass or treble region by switching to a different resistor/cap combo.
I'm pretty your 7T uses tone switching..If the bass and treble pots go click when you turn them,it is a tone switching circuit.
A friend you get for nothing,an enemy has to be bought
Edits: 04/18/16
It is fascinating how advanced the SOTA equipment was back then. They must have done some sort of compensation like that in my Yamaha C-2x, because the tone controls have the least effect on the sound of any preamp I have used. That is very important to me since much of the music I listen too is less than perfect. Tone controls can make this music much more enjoyable.
Dave
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