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I recently acquired an SA 1000 which is set up for a high output cartridge. I can use my Accuphase AC-2 with my Marcof PPA-2 modified headamp, but I'd really like to try the tube high gain headamp section with the 47ohm or 54ohm (NOT K ohm)settings this cartridge likes. Problem is I have no manual, nor can I find one on line except for sale at a very high price.
I'm hoping someone here may have had experience with the Counterpoint in the past, if not currently, or may have an old manual lying around that I could buy at a reasonable price. Any help you can give will be appreciated. Thanks.
Harry
Follow Ups:
resistor selection for loading. The phono has high and Low selection on the selector switch for MM and MC. There are internal jumpers inside the preamp but you may not need to use them. First try the loading socket with what you would like to use for loading.
I'm going by memory but I will double check the Service manual I have on my work computer. you can put the internal jumpers between 1&2 or 3&4 for high and low gain.
I also have the owner's manual just need to find it to confirm.
Hope this helps!
That is the information I need if it is accurate. I saw the input holes for loading the mc, and will be ordering resistors.
What gives me the most pause are the jumpers. Right now they are set on 1&2, but that gives me low gain for a high-output cartridge. That is what I am feeding the headamp into, in place of a high output cartridge.
But if that is the case, then 3&4 must be for the high-gain stage for low-output mc cartridges. I didn't even know that much since there are FIVE rows of pins for the jumpers.
If you could verify the settings for using a low-output MC I'd really appreciate it.
If you would like to share the manuals with me via email that would be very much appreciated.
Harry
If its lower than .5mV it may not work with this preamp. I was using my Shelter 901 which is .5mV and it had lots of gain. I had a load of 100 ohms.
Does the SA-1000 have the 12AX7's in the phono section? cause some have swapped out the 12AX7 for 5751's.
Pins 3&4 on the jumpers will be the highest gain. If that's not enough then you will maybe need a step transformer for that MC.
let me know what the results are.
Hope this helps.
The AC-2 has an output of only 0.18mv at 5 cm/s. Pretty low.
But thanks for confirming the jumper settings.
The cartridge has a minimium resistance loading of 50 ohms. Years ago I used an SA-2 with this cartridge and 54-57 ohms seemed optimal to me .... was recommended by the west coast dealer I bought the SA-2 from.
It will be awhile til I get this set up. Have to loaate quality resistors, and then pull the preamp from a very difficult to service setup.
Harry
those should be good enough and you get some other values just in case without breaking the bank.Just give the Sa-1000 preamp a shot and see how it reacts with this cart. That's the only way you will find out.
The Counterpoint SA-1000 responds very well to a few simple upgrades that will kill some more expensive preamps. better power supply caps, a few good resistors in the signal path, and some really good film caps in the signal path and you will have a really nice sounding preamp. preamp. I know cause I did mine like that.
Edits: 09/27/14
Thanks, Cougar. I've already sourced the Dale resistors. Good minds think alike.
As to future upgrades, I'm going to do that. I'll source the components. I have a friend who repairs amplifiers who I'll have actually do the work since at my age I'm not too steady with the hands.
Did you consider the transformer upgrade as well?
Harry
ps Any chance of having a copy of the tech diagram(s) and parts list scanned and sent?
Harry
But I would first if the preamp is quiet to were there in no hum or buzz with the stock transformer. Just do the other upgrades and leave the power transformer for last so just in case there is any issues you know what change/s may have caused it. I did that along with other stuff and I had a hum I could not track down forever but I finally found that transformer was causing it. the cure was removing the Plitron transformer from within the chassis and making it external.
I also totally upgraded the phono section too! ;)
best of luck!
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