GREAT SCOTT!!! - It's NOT a Dynaco??? - H. H. Scott 121-C Preamplifier - DONE!

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SteveFord

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I'd put them up if I could but I see the same thing that you guys do.
It could be the way that the photos were loaded.

JohnR found where the photos were hosted so I'll do my best to try and get them reinstated in this thread. 
« Last Edit: 12 Dec 2012, 10:40 am by SteveFord »


Hank

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Steve:  thank you for working on getting those photos accessible. :thumb:

swing1951

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Greetings from Reno.
Been working on one of these--complex bitch, especially for a newbie like me.
The pix no longer seem to be available on Google images, or anywhere else. Being able to view them would be a great visual aid for me. I did take digital photos myself of my 121c and tried to make some diagrams, mostly successfully. But I can't, for the life of me, seem to get the Range switch reconnected properly. Dynaural is involved, as is the rumble switch, and I've become hopelessly buggered up. 'Bout ready to heave it in a dumpster. No, not true. But I am severely frustrated. Wish Bill were still around. Does anyone have one of these HH Scott 121c preamps or is familiar with them?
I've studied and studied the schematic but it doesn't make a lot sense (to me--probably similar to a situation of one who doesn't know how to read music attempting to). In addition, in the few photos I've been able to find of the undersides of these devices, they seem to vary, in the wiring, the capacitors used, from unit to unit (same model--121c).
I did alright with a Scott 99D, recapping, installing new resistors where needed, and it sounds great, but it was a cakewalk by comparison. This preamp is infinitely more complex, even convoluted. Maybe I should take it to a pro, now that I've totally screwed it up.
Any comments or advice are welcome. Copies of the photos of Bill's work would be very welcome.
Thank you.

Shakedown St.

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This post has not been updated in a long time now, but I've been using this since '09 as a reference while restoring my 121C. I happen to have saved every photo that has long disappeared. I have saved them to Flickr so they will not disappear again. I will upload them again for you all here, and thank you to the one and only Bill Thomas who made this possible.

Post #1







« Last Edit: 4 Jun 2018, 04:28 pm by Shakedown St. »

Shakedown St.

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August 13th, 2009 - Update:  "Formulating a 'Plan of Attack'!"

missing photo.

Top View Shields Removed:



Front Panel Rear View:



Gnawed Tubing:



Wiring Control Sample:

« Last Edit: 4 Jun 2018, 03:47 pm by Shakedown St. »

Shakedown St.

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Sunday, August 16th, 2009 - Update:  "It's a DIRTY Job!!!" - Part One

Main Chassis Quad Caps Removed:



Separating Quad Cap:



Quad Cap Guts:



Quad Cap Internal Tar:



Internal Tar Removed:



New Quad Capacitor:


Shakedown St.

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August 21st, 2009 - Update:  "It's a Dirty Job - Part Two"

Quad Cap Guts Removed:



Quad Cap Base With Holes Drilled For Capacitor:



Initial Test Fit Prior To Soldering:



missing photo.

Quad Cap Completed Internals:



Completed Quad Cap Partially Covered:



Quad Cap Cover Installed Not Glued Yet:



Final Inspection Stamp:



Unsoldered Wire On Selenium Rectifier:

« Last Edit: 4 Jun 2018, 03:47 pm by Shakedown St. »

Shakedown St.

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Sunday, August 23rd, 2009 - Update:  "Separation Anxiety!"

Top Front Panel Of Main Chassis Removed:



Front Panel - Removed - Top Shot:



Bottom Front Panel Of Maine Chassis Removed:



Main Chassis - Top - Front Panel removed - Three-Quarter Shot:



Front Panel - Removed - Inside Shot:


Shakedown St.

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September 2nd, 2009 - Update:  "Our 'Distinguished' Panel!"

Bent Main Chassis:



Front Panel - Right Side - As found:



Front Panel - Middle - 2 Pots Removed:



Front Panel - Right Side - Switch Removed:



missing photo.

Front Panel - Right Side - 75 Percent Stripped:



Front Panel - Right Side - Rebuilt - 33 Percent Completed:



Front Panel - Right Side - Rebuilt - Completed



repeat photo.

repeat photo.


Shakedown St.

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September 3rd, 2009 - Update:  "Trouble!  With a Capitol 'T' and That Rhymes With 'P' and That Stands for POT!"

Original Potentiometer Exploded:



Original Potentiometer Rotor And Shaft:



Radio Shack Potentiometer:



Radio Shack Potentiometer Gutted:



Potentiometer Rotor:



Radio Shack Potentiometer - Modified Element - With Slip-Ring Added:



Potentiometer - Rotor And Shaft - Original Plus New Element"



missing photo.

Shakedown St.

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September 11th, 2009 - Update:  "Our Latest 'Panel Discussion'!"

Front Panel - Left Side - As Found:



Front Panel - Center Area - Stripped:



missing photo.

Selector Switch - Rear Section - With Shielded Wiring:



Selector Switch - Front Section - Initial Rebuild Stage:



Selector Switch - Front Section - Resistor Detail:



Front Panel - Left Side - Potentiometer Wiring:



Front Panel - Left Side - Selector Switch Wiring - Completed:



repeat photo.

Front Panel - Left Side - Completed:


JerryM

This post has not been updated in a long time now, but I've been using this since '09 as a reference while restoring my 121C. I happen to have saved every photo that has long disappeared. I have saved them to Flickr so they will not disappear again. I will upload them again for you all here, and thank you to the one and only Bill Thomas who made this possible....

That is AWESOME, Shakedown. Thank you for taking the time to restore Bill's photos to the thread  - you Rock.  :thumb:

joeriz

Yes, thank you for doing that! It’s fantastic that Bill’s work can be preserved so that others can benefit from it. Bill Thomas was a true gentleman and a kind soul who willingly shared his knowledge and enthusiasm with the audio community. But, more than that, his humility and civility always impressed me greatly. I could never imagine him posting an unkind word or a snarky remark. Would that there were many more like him on the internet and in the real world.

dB Cooper

I think Mr. Thomas passed not long after I joined here, so I didn't really get to know him, but I remember he used to post these vintage restoration projects all the time, complete with very good instructions and photos; that he answered many questions, and that he had this idiosyncrasy of "putting stuff in quotes" and ending practically every sentence with an exclamation point!
Excellent addition to the vintage library here! Amazing! It would be "Super mega amazing" if "someone with mod privileges" could put them back into the original posts! Oh jeez! Now I'm doing it!

Thanks Shakedown AND Mr Thomas. +1on joeriz' comment.

Shakedown St.

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So thrilled when I found them on an old hard drive I was about to toss. I had no idea he had passed until recently, very glad I kept them around.

More photos to come throughout the week once I get them online, I'll keep you guys posted. -  Ben K.

dcchris

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Thanks for offering these Ben. It's really great to see some of these photos made available again. All of the Bill Thomas restoration series were a real gift to those of us who pursue vintage audio restoration. It's a shame some of many photos are no longer linked to the threads. I hope you still have plans for sharing any remaining photos for this series.
Dennis C.

SteveFord

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Thank you for taking the time to do this.