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Old 14th August 2008, 08:13 PM   #1
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Default nytech ca252 woes

Mmm, bought one of the above examples off ebay a few weeks ago, finally got round its various idiosyncrasies and got the thing running, something to do with bridging preamp and aux din sockets that where missing, sounded OK, 25 years taking its toll.... curiosity made me open the case, its a strange thing for sure!!!

After seeing the weird heatsinks and multiple cards, no ventilation whatsoever, I decided to modify it and bring it up to date with new caps and op trannies, then rehouse it all in an ally case, fine so far, then I thought i'd clean it up somewhat, fit decent sized heatsinks on the flipped amp boards and get rid of the tone control and tape inputs and pre amp outs, fit a stepped attentuator

this is where it all went slightly wrong!

I cant figure the tape /aux switch circuitry how it would work? firstly its on an output from the pre board, it has no connection to the phono stage, and seems to be linked to the tone control?

try getting a shematic !



Might try connecting as originally intended one input RCA , to the mainboard phono input as the card was going to be removed anyway and bridge the tone pcb pins with a 100k resistor.

British hifi!



Anyone got any info on this amp?
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Old 14th August 2008, 10:37 PM   #2
lohk is offline lohk  Europe
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First of all:
The Nytech 252 is an absolute classic, a class for itself actually, and to modify it in the way you did or intend to is an insult! Please try to restore this device as it is, an idiosyncratic piece of british ingenuity and a part of british hifi history!

I do not remember any tone control and also my schematics do not show any. My schematics sheets (original drawn by Nytech Audio) do not show any, and I also remember that the CA-302 does not have any. Does your amp have a tuner also inbuildt?

Signals are routed from inputs (toggles) to the tape switch (another toggle).

Balance pot is before the line amp and the volume pot after (old type P1041-2)) and vol and bal following each other (new type P1041-3).

You can sensibly rework the amps by changing caps (amp output caps and others).


Before you change your amp to "a mess" please give it to me!

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Old 15th August 2008, 12:22 AM   #3
lineup is offline lineup  Sweden
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Default Re: nytech ca252 woes

Quote:
Originally posted by rocco gibralter
bought one of the above examples off ebay a few weeks ago
try getting a schematic !
British hifi!
Anyone got any info on this amp?
Nytech CA252 or Nytech CA 252
... and you did tell you DID SEARCH our forum, didn't you?
You must have when posting a new topic.
Was it the usual white lie we often do = not 100% true

Now member forr has some guess about this amplifier SCHEMATIC
in this post
http://www.diyaudio.com/forums/showt...52#post1551552
Now, I have no idea, if forr is correct.
But you can have a look

Lineup
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Old 15th August 2008, 01:23 AM   #4
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Hangs head in shame I know its british classic, I nearly bought one in 1982 but went for a.....NAD 3020, This was a sorry example that looked like it had been in an attic for decades so its not like i'm butchering a good one,

I know the one you mean its the ca252cta with active outputs built in tuner, this is just the amp version with power, aux/ disk and tape monitor buttons volume and balance which doubles as tape monitor

Anyway this is DIY Audio, tinkering, improving in out ever quest for the hifi nirvana!

I'll put it back..................

I did look at previous threads and did a search on Nytech I swear!
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Old 17th August 2008, 08:15 PM   #5
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Had a word with Zsolt Huszti a while back...he said bung a couple of 10,000uf caps in it on the output and input side

Pah to purists!!!!

thanks for the info lineup!!!
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Old 17th August 2008, 08:53 PM   #6
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by rocco gibralter
Had a word with Zsolt Huszti a while back...he said bung a couple of 10,000uf caps in it on the output and input side

Pah to purists!!!!

thanks for the info lineup!!!
what did he mean "output and input side"?
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Old 17th August 2008, 09:05 PM   #7
lineup is offline lineup  Sweden
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when want to find something
here in diyaudio.com
we better do a 'site search' using www.google.com
I have found this is the most effective way to find here

I can not give you much hope to find anyone having schematic or service manua hare ion forum.
Anyway, my searching gave me this impression from pages I read:
This is one very good power amplifier .... Nytech CA 252

The actual search you enter at google, looks like this
Quote:
site:www.diyaudio.com nytech
Lineup
Diy Amplifier projects & schematics (members only)

Click the image to open in full size.
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Old 18th August 2008, 10:28 AM   #8
lohk is offline lohk  Europe
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'cause I do not have access to my website at the moment here are the schematics I have on a private site (open only for the next days)
http://klaus.hollinetz.at/nytech/NytechCA252.html
(scanned from original factory service copies)

enjoy
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Old 18th August 2008, 11:20 AM   #9
lineup is offline lineup  Sweden
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Quote:
Originally posted by lohk
'cause I do not have access to my website at the moment here are the schematics I have on a private site (open only for the next days)
http://klaus.hollinetz.at/nytech/NytechCA252.html
(scanned from original factory service copies)

enjoy
yes he will enjoy, lohk (Klaus aus Österreich)
he has waited several days now - for some helping angel
then comes along you - and not some angel
anyway, you have made his day now
and will go Straight to Heaven when you die
as some angel or not

Lineup

PS. I have saved copies of those images. For rocco.
In case he cant get them before you clean up your web files. DS.
http://lineupaudio.freehostia.com/forum/index.php
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Old 19th August 2008, 12:42 PM   #10
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Thankyou very much Ihok now i can make some sense out of it! brilliant!!!

To be honest, The real reason i decided to mod the amp was....has anyone tried to get the tunnel shaped heatsinks back on the amp boards its a nightmare, i heard the only way is to glue the nut and washer on to the trannies then the mica washers slip all over the place because of the thermal compound whilst you attempt to insert the two securing bolts!, not only this it serves as an oven to trap heat, prob the reason for the early reliability problems? definite room for improvement with more efficient heatsinks!!!

thanks again guys!



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