The Secret Society of Lathe Trolls

Well done, cool and elegant. Bravo!!!

Thank you, Emily, that's my system, been hyper-absorbed in it for about 18 months. There will be more pics and stuff as I shoot them, but I want to thank Len Horowitz especially for opening his shop to me, furnishing me with every scrap of data he has, both written and spoken, and generally being a ...

DC resistance vs AC nominal impedance...

Yay! I'd contemplate a recap of all electrolytics and tantalums. Did this on the 24 track, cured a large pile of ills in one go!

Yes, they are, and either manual should work. How about the other pwr rails?

I'd check the pass transistors for the logic PSU, they're on the deck casting. Do you have a manual? I have two A80 multis, and they're pretty solid. Also the Frako electrolytics are probably suspect, simply due to age. I MAY have an extra manual for the A80-16, which would largely apply... have to ...

I have the same situation with my 1574E amps - it's output stage bias circuit related, annoying but not harmful. Plan to do a mod for this at some point, will share result at that time.

Very beautiful package! I would like to see the circuit....

Well done, and well written, Steve.

Very bloody NICE! Great work! You rock....

OK, it's kicked off! Best luck to all Trolls...

Seems to have been removed....

Oh dear, I had a "bench supply, variable" in mind. I'm just so used to this sort of tech it'd never occur to me to not ramp up from zero....

I find I can't wade through all the blegthorpe in this thread, so here's MY dos centavos: It's an incandescent lamp. ANY PSU will do, AC or DC. The pattern in the glass is like a gobo: no defined pattern edges; a frosted lamp would probably do as well. It's that 45 degree angle that matters... If yo...

Todd: The two replies above cover all I might have said. Bravo! for an excellent intro to the world of Makrolon!

I use the most conservative version, and tweak up from there.

Hmmm.... I suppose one could cut slew-rate limited SMPTE code (in mono), and get an absolute time ref, and the word geometry would tell the system which way we're going.... [square waves don't cut well - any more than they did when striping TC to tape] You could use an old Fostex synchronizer to bot...

I am willing to bet that the data is identical on both channels, save for a 90 degree phase offset (quadrature). This enables the system to tell which direction of rotation the disc is currently experiencing. I would guess that the signals are zero-cross detected, and thus speed and direction are ex...

IMNSHO, that would be precisely what I'd tell 'em! Pretty easy cut, seems to me. Like a bi-phase encoder on vinyl... Best of luck!!!

Perhaps I may be able to do you some good: I am in the last stages of bringing a Scully tube system to life, fully MIDI automated using Nuendo (my bread&butter workstation) and Crestron processors and touchscreens. The only thing left is variable pitch/depth, still restoring the 261C, but fixed pitc...