Author Topic: Serial # Request - 78-995 (Read 835 times)

juelu · « **Reply #30 on:** August 16, 2005, 09:41:05 PM »

Dave - thanks for the welcome. I guess I'm in the right place because I've been entertained by the forum! I'm primarily an acoustic 1800s turn of the century & earlier Martin guitars & banjo guy but being a retired Bell Labs engineer as well, this mystery has got me too. I did a bit of puzzling & photographing today and I've worked out most of the associations between the controls & modules and got about a dozen close up photos of the electronics & control cavity . One set in particular might jog Mica or Ron's memory. The two potted modules in the center of the upper electronics cavity don't connect at all to any of the other modules there. They are each connected to the control cavity by a seperate 13 wire ribbon cable that mainly interconnects with the 2nd, 3rd, 5th & 6th switches (no matter which end you start from ;^) and some control pots.

The switches mentioned above connect to what I thought was a small potted network module, but on closer inspection it appears to be 3 small potted 2 lead elements (capacitors probably) glued together and oonnecting to the ON-OFF-ON DP switches with resistors.

The two modules in the upper cavity (one Bridge PU associated & one Neck PU associated) seem to control the shaping under control of the CVQ pots and the pots that introduce resistance to modify the Q. But I'm rambling .....

The part that might jog memories is the label potted into one of the control modules (and partially visable on the other). The label reads:

.033K400

The K is underlined and the marking is followed by a mark that looks like a capital P overlaid by a capital L.

Hope this is worthy entertainment / historical research. I have more photos & lots more info but I have a Festival I have to finish before Labor Day weekend ( www.FoxValleyFolk.com )

Juel

dadabass2001 · « **Reply #31 on:** August 17, 2005, 05:13:49 AM »

Hi Juel,
Yup, your pictures are much better than mine.
I'll just stand by quietly and let the electronic grownups talk (but i'll be listening/absorbing like crazy!)
Mike

David Houck · « **Reply #32 on:** August 17, 2005, 08:02:14 AM »

Thanks Juel!

I hope Mica and Ron get a chance to look at these soon.

juelu · « **Reply #33 on:** September 13, 2005, 07:25:43 AM »

Anybody still following this thread?

dwmark · « **Reply #34 on:** September 13, 2005, 05:59:04 PM »

yes. nothing to add (other than ooohs and aaahs) but just as interested as most of the other members.

dadabass2001 · « **Reply #35 on:** September 13, 2005, 07:24:08 PM »

Hi again Juel,
yeah I haven't forgotten this puzzle, but I'm trying not to jiggle any Wickersham elbows. I tried a Google search for Mike Reed, but came up empty. I lack the knowledge to even attempt reverse engineering those controls. I suppose if Rick were amenable, we could try a more complete trial of the system. maybe hook up two amps and start again to identify individual functions.
Mike

juelu · « **Reply #36 on:** September 14, 2005, 04:38:47 AM »

Is anyone still following this thread? I have more photos but I was waiting to see if there were any comments on the first set.

David Houck · « **Reply #37 on:** September 14, 2005, 04:42:56 AM »

Hi Juel; yes, we're still here! I think Mica, Val and the folks at the shop are even busier than usual recently. But, I'm sure they are as intrigued as the rest of us.

David Houck · « **Reply #38 on:** September 14, 2005, 04:47:54 AM »

Go ahead and post your pics. I think most of us are just scratching our heads. It will probably take the folks at Alembic to figure it out.

juelu · « **Reply #39 on:** September 14, 2005, 04:57:14 AM »

OOPS - I got all the updates after I posted again! Refresh didn't give them to me. Sorry.

Rick has some info on Mike Reed that he found - I'll get it & post it.

I ran through both outputs and control switches and as I remember it appeared that the 2nd & 3rd and 5th & 6th ON-OFF-ON do what we sort of initially thought Mike. I have to go back to my notes (the Festival wiped out my available scratch memory ;^), but I think everything was working. I'll refresh my memory today & post what I found out so far.

Juel