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Old 25th January 2009, 03:20 PM   #1
Valvepower is offline Valvepower  United Kingdom
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Default Hi from a new Kid on the Block.

Hi from a new Kid on the Block.

I came across this forum whilst looking for the Motorola application note AN-483 on Darlington power amplifiers. I found reference to this note in an article in the Aug 1971 copy of Wireless World.

This has all come about because, Iím thinking of playing with a pair of Ď79 made HH TPA25-D power amplifiers, and going by the circuit layout & following the PCB it appears to use (Motorola) Darlington transistors marked with custom HH pt #ís. Iíve also noted there are a few other small similarities between the Motorola circuit in WW and the HH TPA.

The AN-483 thread is in the following post: http://www.diyaudio.com/forums/showt...threadid=99967

Hopefully Iíll be able to get in contact the members who said they have the application note.

And me Ė Well Iím an engineer employed in the UK electronics industry, but at heart Iím an audio DIYer. This comes from playing with discarded Quad II, Decca & Leak TL12+ gear when I was a Kid of thirteen back in 1973. My first job was building valve guitar amplifiers.

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Old 26th January 2009, 05:00 PM   #2
Cal Weldon is offline Cal Weldon  Canada
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