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I can see a lot of the traces through the board in your photo.

I assume that is the zener you are referring to...

Apply voltage through that series resistor and see where they zener out...

More likely they picked up some surplus from Fry's electronics and used them by the looks of that assembly. :-)

No way custom made Perry

Looks pretty basic Perry.

When did he write this??

Yup

nor do mine

Audio Product eStore (whiteoakaudio.com)

Mark does this mean you currently have no email through Gmail?

I have plenty...

It also depends on the ground trace that you are dumping these decoupling currents into. In general, I always strive to dump the power supply decoupling currents into a separate path to the single point ground. I am not sure what that trace that George tied to is also responsible for. If you...

It wasn't the best in the 70s, but it was the only quad in the 70s which made it attractive for designing smaller and more dense designs. And it was cheap and easy to employ, still is. For demanding applications in the early 70s, I always employed LM709s which were decompensated LM741 cores or...

If we click on that link, will we end up in the same boat that you are currently in??

Gmail reads and uses all your email contents Mark :-)

That is a clear difference George. I will have to check how they used the original quad packages as well. I cannot recall whether one quad was used on each channel or if they shared them between channels. Checked and yes, they did the unthinkable and shared the 4 op amps in the quad package...

Try a tougher test at 10KHz and then at 20KHz and at a preamp output at around 2V rms

1000 Hz is no test George...and there is no clear winner in this data to my eye, they are virtually the same in every condition.