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Old 11th February 2013, 01:02 PM   #1
mikej56 is offline mikej56  United Kingdom
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Default 1979 Amplifier kit

Hi Folks, Wondered if any of you have either built this kit, or heard the complete unit in action?

Practical Wireless Winton 50w/ch mosfet amplifier April 1979.

I bought this a few years ago and had forgotten all about it, I rediscovered while looking for something else, haven't decided whether to build or sell it, comments or advice welcome.
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Old 11th February 2013, 01:12 PM   #2
Mooly is offline Mooly  United Kingdom
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A pal of my mine at college (we were on the same electronics course) built this... and I built the PW Purbeck 'scope.

I seem to remember it was pretty decent (was it based on the Hitachi lateral FET application notes ?) but its all a long time ago...

If you have the complete kit and case etc then I'd say its well worth a go
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Old 11th February 2013, 01:25 PM   #3
mikej56 is offline mikej56  United Kingdom
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Hi Mooly, Yes i have complete kit. The output stage is 2sk133 / 2sj48 Hitachi. So probably the first amp kit to use mosfets.
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Old 11th February 2013, 01:30 PM   #4
Mooly is offline Mooly  United Kingdom
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If I were you I would definitely build it. Power it up with a bulb tester initially to help "reform" the PSU caps (and I'm sure they will still be fine). Any small cheapo electrolytics could usefully be replaced by modern but that's about it.

I think you'll be surprised how good it is.
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Old 11th February 2013, 01:38 PM   #5
mikej56 is offline mikej56  United Kingdom
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Yes I had thought replacing the original caps 4700 /63, but as you say I could reform the oldies (plenty of experience of reforming the HT radio caps)
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Old 11th February 2013, 01:41 PM   #6
Mooly is offline Mooly  United Kingdom
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I'll look forward to hearing what you think of it
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Old 11th February 2013, 08:08 PM   #7
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Reforming is nice for electrolytic caps. I start with the ohmmeter, up to 2 vdc for the oxide dielectric. Then I look at discharge of volts over time and throw some away right there. Any electrolytic cap more than a year from the distributor. There is a shockingly short shelf life on the cap spec sheets, even big distributors have sales to get rid of electrolytics that need reforming. Reforming doesn't do **** for the cap rubber seal. I put a new CDE can cap in my ST70 in 1982, ran it a couple of hours, measured the watts and put it away since I couldn't buy non-Soviet output tubes. In 2011 I bought some Euro Union made tubes (JJ), checked the caps with the DVM, warmed up with a 70 VAC transformer (stuck variac), played it 3 hours on main power. Very nice, adequate power on 8 ohm resistors. The next day it blew the fuse. Slime had leaked everywhere out of the 5 hour running +29 years idle cap. Oxygen never sleeps, running or not. Tubes, disc caps, high quality (mallory, sprague, ) film caps don't deteriorate over storage time. Carbon comp resistors can, depends on the quality of the paint to seal out moisture. *****y resistors can look just like AB or Sprague ones. Measure them. Semiconductors, sometimes the leads rust off, depends how close you are to the sea. People that own Farfisas say on those the transistor metal cans rust off.
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Old 11th February 2013, 08:24 PM   #8
balerit is offline balerit  South Africa
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Quote:
Originally Posted by mikej56 View Post
Hi Folks, Wondered if any of you have either built this kit, or heard the complete unit in action?

Practical Wireless Winton 50w/ch mosfet amplifier April 1979.

I bought this a few years ago and had forgotten all about it, I rediscovered while looking for something else, haven't decided whether to build or sell it, comments or advice welcome.
I have the original article somewhere, but gee, what a find
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Old 12th February 2013, 01:43 PM   #9
djk is offline djk
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"The DH-200 is available either in kit form at $300 or in factory wired form for $400. Hafler introduced the amplifier in the summer of 1979"
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Old 12th February 2013, 05:13 PM   #10
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by djk View Post
"The DH-200 is available either in kit form at $300 or in factory wired form for $400. Hafler introduced the amplifier in the summer of 1979"
I don't get the connection... Hafler DH200 and the Practical Wireless Winton.
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