JL Hood schematic circa 1985?

[pmkap]

Would anyone know where I can find the schematic, etc... first published in Electronics Digest, Winter 1985. Geoff Moss's 'Class A Website' is MIA, and Google hasn't shown it.

I'm specifically interested in the feedback network.

Thanks in advance.
Paul

 

[Nisbeth]

Which schematic (from Geoff Moss' site) is it you're interested in, specifically? I think I saved most of it to my HD after the last update. If you want I'll look for it 🙂

/U.

 

[pmkap]

Nisbeth,

I'm not sure which schematic it is, whether its MOSfet or BJT....
I only know it uses an unusual feedback scheme with the typical electrolytic to ground replaced with a series film cap (with a topological change).

The schematic was referenced in an aritcle in Audio Amateur 1996, issue 1. by Richard Guest, 'On Power Amplifier Feedback Networks". It uses the typical JLH Cdom 5pf from the Vas collecter to the feedback node, 150k & 1.2k resistors, and 9.4mmf cap.

So I actually know the confiuration and values of the feedback scheme, but I don't know the context in which it was implemented.

Thanks,
Paul

 

[pmkap]

Nisbeth,

Thanks for your kind offer. Geoff just emailed me a scan of the circut.

Thanks again,
Paul

 

[Audiofanatic]

Nisbeth,

Thanks for your kind offer. Geoff just emailed me a scan of the circut.

Thanks again,
Paul

Hi Geoff,

Would it be possible for you to e-mail me the schematic too?

Thanks in advance,

Audiofanatic 😉

 

[rchua77]

Hi,

could anyone email me the updated latest schematic of the JLH SE BJT amplifier? Been looking for it on the web but the site seems to have closed down. email addy is rchua77@hotmail.com

Regards
Chua