Hello
just out of interest do you have the correct Mosfet output transistors ? or are you planning to use something different
just out of interest do you have the correct Mosfet output transistors ? or are you planning to use something different
I have six pairs of K134/J49 selected for Vgs and another 4-5 pairs spare (2-2 K135/J50 I plan to use in power supply).
Hello all will update more later as my workshop roof is being replaced at the moment ..
so every thing has come to a stop unfortunately .. any updates from other members builds ?
regards
so every thing has come to a stop unfortunately .. any updates from other members builds ?
regards
The stereo version of the JLH 80Watt Mosfet amplifier, built from the Williams-Hart kit, was my first venture into DIY Audio and I was delighted when it worked first time (not a record I've managed to maintain over the years!). I coupled it with the HiFi News DCI speaker project (designed by Martin Colloms) and had a very fine sounding system as a result.
I was also fortunate to meet John Linsley-Hood - his bungalow in Monkton Heathfield was just a couple of miles away from me.
I was also fortunate to meet John Linsley-Hood - his bungalow in Monkton Heathfield was just a couple of miles away from me.
He was quite well known around Taunton, I recall he was a member of the local photography club and he used to write reports in the local newspaper about their meetings.
I met him when the Mosfet design appeared in, I think, ETI magazine, and I was interested in building it and he was very helpful with highlighting the PS fault that was in the article. He talked a lot about valve amps and the need to be modern and take advantage of technology developments. Personally he was very friendly but had an air of eccentricity about him. My abiding memory of visiting him at his bungalow was sitting in his front room talking with him lighting the open fire with what can only be described as a gas-fueled flame-thrower!
I met him when the Mosfet design appeared in, I think, ETI magazine, and I was interested in building it and he was very helpful with highlighting the PS fault that was in the article. He talked a lot about valve amps and the need to be modern and take advantage of technology developments. Personally he was very friendly but had an air of eccentricity about him. My abiding memory of visiting him at his bungalow was sitting in his front room talking with him lighting the open fire with what can only be described as a gas-fueled flame-thrower!
ok .. what was the PSU fault as I have made the hart PSU pcb's and all seems to work ok
thanks for replying ..
regards
thanks for replying ..
regards
Wow, what a story, Nautiboy! 🙂 Good to read.
Still no further progress with the builds, I have had some serious months behind me. But eager to continue work. I'm selecting parts from my Stock as I have time and fill the BOM, hopefully some restful weeks in january and do some serious work. I also dug out the transformer and checked its state. I have the skeleton of a big Denon multichannel amplifier that will accomodate everything nicely and a pair of noble VU needle meters to fit in it.
Still no further progress with the builds, I have had some serious months behind me. But eager to continue work. I'm selecting parts from my Stock as I have time and fill the BOM, hopefully some restful weeks in january and do some serious work. I also dug out the transformer and checked its state. I have the skeleton of a big Denon multichannel amplifier that will accomodate everything nicely and a pair of noble VU needle meters to fit in it.
There's more info about JLH online, here's the Wikipedia entry
https://en.wikipedia.org/wiki/John_Linsley_Hood
and there's an obituary on the Times website:
https://www.thetimes.co.uk/article/lives-remembered-mf3fw8mzsgn
https://en.wikipedia.org/wiki/John_Linsley_Hood
and there's an obituary on the Times website:
https://www.thetimes.co.uk/article/lives-remembered-mf3fw8mzsgn
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