 
|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
|
|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
24.63.247.173
In Reply to: RE: Scott 99D Mono integrated: Restore or part-out posted by Spantou on December 23, 2020 at 16:05:59
Maybe it's an opportunity to build something special with them. There is no way I would part them out. If the front panels are trashed, then be creative.
Follow Ups:
Thanks for the nudge to be inventive with the front panels. The primary reason for considering to "harvest the transformers" is to build a stereo power amp with a single volume control. But I hesitate to trash two vintage Scotts.
With the front panel of my Eico ST-40. Just veneer with contact cement. Covered up the unused holes after the rebuild. Just volume, 3 input selector, power switch. No phono, tone controls, etc.
Your wood veneer looks very attractive! Well done! How did you cover up the unused holes?
I own a couple of Eico St70 and St40 and I will keep your suggested "trick" in mind when I rework them.
Unfortunately this veneer application will not work for the Scott 99D, because the front panels, made from ~14 gauge aluminum, were badly bent at the corners.
I just veneered over the holes. I guess I could have done the old masking tape on front and pour epoxy from the back trick but didn't. The middle black strip is thin basswood from the hobby store. Thin styrene would have worked too. Gary Dodd (sadly deceased) did the rebuild. He took it back to the chassis, transformers, and tube sockets. He kept the original circuit but beefed up the power supply. He eliminated tone controls, phono stage, the goofy speaker wiring scheme, etc. Sounds great. Attached is a pic of the underside wiring after he was done.
Beautiful work! A joy to look at it. Sorry we lost him.
What output tubes are you using? I'm curious if the modern versions of the 7591 "deliver the goods"
I'm using vintage 7591 in the amp. On Jim McShane's site he warns that the new ones may not work. I also have a vintage backup quad just in case. I also have a Dynaco SCA-35 that he did. No tone controls, phono stage, etc.
Sounds great. He did amazing work. If you ever decide to mess with your ST-40, let me know and I'll send the schematic of the power supply mods he did.
automotive bondo + grinder ? shave 'em and save 'em!
Merry Xmas!
The 99-D schematic suggests easily reversed field engineering changes could solve the volume control conundrum.
Take advantage of the already present tape monitor loop support. Connect a jack directly to the power section and disconnect the OEM 500 Kohm control. A fixed 470 Kohm part handles the grid to ground duty. Use the recording O/Ps of the pair to drive the I/Ps of an external stereo buffered volume control. Said buffered control drives the pair of power sections.
Eli D.
| FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
||||||||||||||
This post is made possible by the generous support of people like you and our sponsors:
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2025, Audio Asylum, all rights reserved ]
