30 years on

5/8/2010

My stereo has had various components replaced over the years; speakers, CD players, cassette decks, record decks, tuners. One part has remained in use for 30 years - the amplifier. It is one I built and is an E.A Rule design called the PW Winton, that featured in the March 1979 issue of Practical Wireless. I have only had to repair it once when a coupling capacitor dried out and went noisy. A very reliable amp, thanks mainly to the output stage using complimentary Hitachi power MOSFETS (2SJ48 and 2SK133).These devices have a negative temperature coefficient so there is no risk of thermal runaway. When I get time I will scan the article and put it online.

6 Comments

Edward Rule

21/9/2015 07:40:02 pm

Hi, Just come across you comments. I was the designer of the Winton and it was reviewed by Gordon King but the review wasn't published until a few years after it was in PW. At 86 years I am still designing but mainly aerials for amateur radio. I may have a copy of the review so if you contact me I will look it out and scan it.
regards Ted G3FEW

Richard

22/9/2015 06:52:20 pm

Hi Ted,
Great to hear from you, and that you are still designing. I am still using the Winton as my main stereo amplifier.
I just discovered that the Winton articles are online in the 1979 March, April, May, and June editions of PW, available here: http://www.americanradiohistory.com/Practical_Wireless_Magazine.htm

Ted

22/9/2015 08:16:01 pm

Hi Richard
Great to hear from you and that the Winton is still going strong. Did the PW series eventually publish a review? I can't remember but I believe another magazine did. If you would like a copy send me your email address and I will send a pdf copy after I have scanned it.
I will look it out today and try to get it off to you asap.

Regards
Ted G3FEW

Richard

23/9/2015 10:11:54 am

I have never seen a review. Thanks in advance for sending the one you have.
r4keys@gmail.com

Donald Reid link

4/3/2017 04:50:56 pm

Amazed to find this string of comments. Ten of us got together here in Christchurch, NZ. Some built cabinets, some organised components, some the toroidal transformers, some the circuit board ... most built their own circuit up. This was all mid-late 1970's?
I have been using mine on a pair of Tannoy Cheviots ever since. Would love to have a copy of the review if anybody has it ! Love this amp. donald@imatters.co.nz

john dalby

5/3/2017 01:15:00 pm

Wow. just been hunting round for what the class for the Winton PW is. Class A or Class AB.
what a find this was.
By the way hi to you all and great to see Ted still at it, as it were.

30 years on

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