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Old 5th February 2003, 11:02 AM   #11
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Default KONTRA PUNKT.

Hi,

Quote:
I have seen some very cool Alps pots from Japan at 300+ These look awsome and apparently sound fantastick.
300 quid for a couple of pots??.
For that kind of money half a dozen of top notch stepped attenuators can be made/bought.

Personally I wouldn't spend too much money on a SA-7, it was a midrange product from CP and no matter how cash you care to throw at it, nothing is going to change that.

Quote:
One are that i have yet to try is running a pre amp on batteries instead of the mains outlet.
Be aware that batteries don't last all that long and that they constantly will discharge while you have the unit on.
The heaters consume the lion share and sonically benefit the least.

Cheers,
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Old 5th February 2003, 11:23 AM   #12
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Default Thamks Frank

Hi Frank,
Thanks for the superb reply,
Will deffinatly bear this in mind for the sa-7.
I had bought it from Ebay and was intending on moddding it for my uncle who is new to high end audio and lives in the usa.

Batterys do look good on paper but i hadnt realised there shortcomings Frank,I had seen a pre amp from Nagra that has some built in.

One Counterpoint pre amp i have seen is the sa-11,ssooooo many valves

The Alps pots are expensive,Have also seen Danish stepped ct-1 but never had one before.

I suppose that the cap replacement etc will bring the most differences,

THX Frank
Ian.
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Old 5th February 2003, 11:28 AM   #13
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Default SA-11

Hi,

Quote:
One Counterpoint pre amp i have seen is the sa-11,ssooooo many valves
And also utterly unaffordable...

If my info is correct only a few hundred were ever sold, philosophically it is much along the same lines as the Croft Mega Micro which was sold for a fraction of the price.

Cheers,
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Old 5th February 2003, 03:14 PM   #14
Bobken is offline Bobken  United Kingdom
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Default Re: KONTRA PUNKT.

Be aware that batteries don't last all that long and that they constantly will discharge while you have the unit on.
The heaters consume the lion share and sonically benefit the least.

Cheers, [/B][/QUOTE]

Hi Ian,

It is good to see some appreciative comments from someone, and I bet Frank is pleased with those, as it makes the effort worthwhile. There are far too many folk around who spend their time trying to argue or discredit what others have said, and most of them probably don't know much about the subject, anyway!

You can rely on what he has to say about valves, as he clearly knows his stuff here.

I had one of your pre-amps for repair once, and it wasn't bad-sounding, but like Frank said, it is doubtful if spending 300 in that way would be very cost-effective.

On the subject of batteries, I am not a valve man, and the only *audio* valve amp I ever made, I subsequently gave away, and I don't now recall the current requirements.

However, on my (remaining!) DIY valve guitar amp (only 2 watts output, so probably not too far different in current draw from a pre-amp) it draws 1.3 amps continuously for the heaters.

Going back to what you said about using watch batteries which normally range from about 30 mAh, to 100 mAh, at that rate I reckon a watch battery would last from between just over one minute to about five minutes, so you would need an awful lot of them!

I live quite close to you, incidentally, in Shakespeare country.

Regards,
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Old 10th February 2003, 06:59 AM   #15
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Cool Hi,Thankyou for the great imfo

Hi to everybody at Audio.com.

I have read all of the replys to my query and am very greatfull for all of the advice.
Please accept my appologies for not replying lately as i have managed to catch a horrible British cold and have beebn flued up for over a week.I dont normally get the flu but the weather here in England has been miserable lately.

Thankyou to the previous reply,Its great to hear from you in Shakespear land("BUEATIFULL COUNTRYSIDE") and many thanks for your comments. I have printed all of the imfo and will deffinatly post a thread later on today.

Have to just go and take some more medicane.......THX
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Old 10th February 2003, 08:48 AM   #16
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Hi Ian

I have somewhere an old SA7 but can't really give any values as i'm currently in Bali. Do yourself a favour and disconnect the balance pot. Firther improvements can be had if you replace the 12AY7 with something with lower Rp and get rid of the follower. 6N1P? I fully agree with Frank that putting too much effort into it is not really worthwhile.


cheers

peter
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Old 10th February 2003, 09:46 AM   #17
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Default 12AY7?

Hi Peter,

Quote:
Firther improvements can be had if you replace the 12AY7
To the best of my knowledge the SA-7 never had any of those in it,did you mean 6DJ8 perhaps?

Also keep in mind the 6N1-P requires more heater current than the 6DJ8.

I would recommend the Sovtek 6922 AKA 6N23-EB if the valves require replacement.

Cheers,

P.S. Enjoy your trip.
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Old 10th February 2003, 11:21 AM   #18
Bobken is offline Bobken  United Kingdom
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Hi Ian,

Sorry to hear of your current misfortune and hope you are soon better.

It never ceases to amaze me that one can feel so really rotten with a simple cold, and yet although we can put a man on the moon, we don't have any effective remedies for this, nor any good preventatives.

You are absolutely right about how lucky I am living here out in the country. I am looking out of the window now with the sun beaming down on the open fields around us, and approx. 40 semi-tame pheasants have just been in our back garden to have their usual breakfast!

It cannot get any better.

Regards,
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Old 10th February 2003, 05:00 PM   #19
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Default Hi Bob,Frank and Peter,Great imfo.

Hi Bob,
Thankyou for the exellent imfo.
I think that the sa-7 does indeed use a 12axy Bob.According to the alta vista website models made in 1984 used this valve and later ones used the 6922.I was deffinately looking at some new valves Bob as the unit i bought does not have any in it and is currently sitting redundant on the hi-fi rack.
Hows the seen in Africa with hi-fi bob?Great to hear from you.
Thankyou,
Ian.
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Old 10th February 2003, 05:06 PM   #20
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Default SA-7

Hi,

Quote:
I think that the sa-7 does indeed use a 12axy
Ian, that was my mistake actually.Not Bob's.

Cheers,
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