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Old 10th October 2007, 06:09 AM   #1
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Default Amplifier Kits Wanted

Hi
I am looking for an amplifier kit that will run on a supply of +/- 65V DC, i have a big old Sony TA8650 but the V-fet power amps are blown
I like the preamplifier in it and would like to use it as an intergrated amplifier

Thanks
Gary
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Old 10th October 2007, 06:23 AM   #2
KLe is offline KLe  Australia
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Default Re: Amplifier Kits Wanted

Quote:
Originally posted by zedrider
Hi
I am looking for an amplifier kit that will run on a supply of +/- 65V DC, i have a big old Sony TA8650 but the V-fet power amps are blown
I like the preamplifier in it and would like to use it as an intergrated amplifier

Thanks
Gary
Hi zedrider
Simple, the one I use and like very much ... GB300D
Details here ... http://www.ska-audio.com/diy/003.html

ciao
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Old 11th October 2007, 12:00 AM   #3
dukep is offline dukep  United States
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Default sounds familiar

I have the same problem with my old pioneer. Same rail voltages.
the output transistors are good, but the driver board is kaput. This big old bastard had fried many a speaker.

I had the sony vfet amp for a short time. Sounded wonderful, but dad would not let me keep it (1000 bucks is too much for a high school student). So I bought a Nakamichi tape deck (still works well).


I'm working on using the national semi driver chip newly developed to drive the output transistors. should be quite compact. I'm trying this to reduce distortion and part count and get the bastard working for a bench amp.


Those amp kits look awesome, but may not fit in the existing case.

Perhaps my solution may work for you. Interested?
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Old 12th October 2007, 05:42 AM   #4
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Default Sony TA-8650/SKA Amplifier Kits

Excellent thank you very much for that link yes these kits should do the job.
Fortunately there is a lot of room inside the Sony to fit two of these hefty buggers.

So when i get them and the job done i will get back

Gary
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Old 12th October 2007, 03:11 PM   #5
gni is offline gni  United States
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Have you thought of using digital modules like coldamp. . .they run
on these high voltage rails. There are many kit/module amp kits
currently.

I have been researching similar issues. . .I toasted my
Yamaha M-45 (adjusting the bias, dropped clip lead onto exposed
jumpers). I am trying to keep the front meter panel, power supply,
heat sinks and all associated parts except the amp section. Same
issue. . . the high voltage rails. . . the Yamaha puts out +/- 64 VDC.
Almost too much for most modules, but. . .

Simple Killer Amplifier
Australian Dollars:
$320 for kit +$40 SH (for two mono 300W modules)
$470 fully built +$56 SH (for two mono 300W modules)

US Dollars
$290 for kit +$36 SH (for two mono 300W modules)
$425 fully built +$51 SH (for two mono 300W modules)


Aussie Amplifiers
http://www.aussieamplifiers.com/index3.htm
Close to $600 Australian per pair of modules plus shipping
About $540 US dollars for same pair

Coldamp (Digital Amplifier Modules)
210 Euros for two 400W module plus shipping
for USA about $300 plus shipping for same two modules
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Old 12th October 2007, 04:06 PM   #6
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Default Sony TA-8650/SKA Amplifier Kits

Hi

I have been looking at the aussie amplifier kits myself, the NX150 fits the bill in most ways, i have emailed them to see if it will run safely on +/- 65v DC,
i suspect it will only be the decoupling caps etc that will need changing but i will wait and see what they say

I have no interest in digital amps being an analogue fan myself.

The prices are all very reasonable for the aussie, ska and ILP amps but i do not know how ILP comapre on sound or reliability.

Regards
Gary
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Old 12th October 2007, 04:25 PM   #7
gni is offline gni  United States
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After a quick check
NX400NL runs on +/- 75 VDC to +/- 85 VDC rails!

The NX150 Amplifier uses +/- 56 VDC to +/- 63 VDC rails!

Maybe a slight alteration to the power supply will result in
a closer match. . . and extra RC network should drop the voltage enough.
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Old 17th October 2007, 04:19 AM   #8
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Default Sony TA-8650/SKA Amplifier Kits

I checked with aussie amplifiers and the NX-150 will safely run up to +/- 70v DC so i have taken the plunge and ordered two of the kits.

I will let you know how i get on with them
Thanks
Gary
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Old 17th October 2007, 01:23 PM   #9
gni is offline gni  United States
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I will be VERY interested to hear how your project goes.

I just cleaned out the shell of my M-45 in preparing it for installation
of the Aussie Amps. . . Rewired the power supply caps and rectifier. .
working on front power meter and LEDs. . . it will be good to see
pictures of your shell and prep work!

I'll upload some picts when I get off work. . .oops. . . I'm at work
getting paid to chat on DIY audio. . .I love America.
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Old 26th October 2007, 06:51 AM   #10
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Well I got my two NX-150 Kits, nicely presented easy to follow instructions.

But on my Boards R28 does not exist at all so i am presuming this to be a modification

also i could not find R13 (10 Ohms 5 watt wire wound) at all, but i do have 4 x 10 Ohm 1 watt resistors that do not fit anywhere.

Has anyone else come across this?

I have sent Aussie amplifiers an email but have not yet recieved a reply

Gary
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