Thank you for so kindly explaining and sharing your craft. I am a newbie starting with building transistor based Class A Amplifier and learning. Thanks much.
This is great Steve and you're an old timer like me (i'm 72). I built this JLH 1969 version in 1980 and was shocked at the great sound quality, but I had trouble controlling the heat on a budget so moved on to class B designs. Now I'm building it again 1996 version.
I have had no trouble getting 10 watts into a 8 Ohm load, using the right voltage and 1 Amp, with any of the five amplifiers tested. It's a matter of the Heat Sink. Steve
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Thank you for so kindly explaining and sharing your craft. I am a newbie starting with building transistor based Class A Amplifier and learning. Thanks much.
Much thanks for being so kind enough to expalin this renowned design and sharing the original article.
Thank u Sir for sharing ur knowledge & thus important matters about JLH 1969 piece by piece.
Welcome to the channel!
Steve
This is great Steve and you're an old timer like me (i'm 72). I built this JLH 1969 version in 1980 and was shocked at the great sound quality, but I had trouble controlling the heat on a budget so moved on to class B designs. Now I'm building it again 1996 version.
Nice to know!!! Thanks
Steve
Great video. Thank you very much for the thorough explanation.
Thank so much! Q: Any thoughts about why a PNP was used on the input transistor?
Thanks for the valuable information!
Where do I buy the amplifier kit?
Amplifier No. 1 is here:
www.aliexpress.us/item/3256802574362827.html
Note that this is a constructed device.
Steve
Is THD for the FET amplifier different to the original bipolar ?
I can't answer that, my THD analyzer is not working. Sorry.
Steve
The circuit boards you show are the JLH headphone amplifier not the power amplifier.
No, the entire series IS about the JLH 1969 10 Watt Power Amplifier described in the English magazine "Wireless World".
Thanks
Steve
@@stevestrivia-bystevewagner4852 You won't get ten watts from a tip41 to220 package. The headphone follows the same topology as his power amp
I have had no trouble getting 10 watts into a 8 Ohm load, using the right voltage and 1 Amp, with any of the five amplifiers tested. It's a matter of the Heat Sink.
Steve