Audiokarma.org
Audiokarma Featured Sponsor

Go Back   AudioKarma.org Home Audio Stereo Discussion Forums > Solid State


We appreciate your help

in keeping this site going.
Reply
 
Thread Tools Display Modes
  #1  
Old 09-03-2006, 10:39 AM
Goldenvoice's Avatar
Goldenvoice Goldenvoice is offline
AK Member
 
Join Date: Sep 2006
Location: Pacific Wonderland
Posts: 109
HH Scott 382 Stereomaster Speaker Ohms?

I aquired a clean Scott 382 stereomaster (SS) at a yard sale yesterday for $2.

A quick test showed the switches and controls needing a cleaning, which I did.

I re-tested it, using only a single small box speaker (8 ohms, I believe - my "test" speaker since blowing a pair on a vintage Aiwa). She heats up the back plate/heat sink fairly quickly - Seems to be around the area of one set of output trans (right channel?) - not around the other - made no difference which side I hooked the speaker to...

Might the speaker ohmage be off, or might it be because I only have a speaker connected to one side? (twix "com" and "main")

Or should I assume it needs a re-caping?

I'm not assuming, being it's solid state, that it's even worth fixing.

Advice???

Thanks, G
Reply With Quote
  #2  
Old 09-03-2006, 12:06 PM
tcdriver's Avatar
tcdriver tcdriver is offline
AK Member
 
Join Date: Aug 2003
Location: Valley of Heart's Delight
Posts: 3,702
The speaker impedance is not the issue. The connection between the "main" and "com" terminals is correct. You have a bad channel. The most common fault is a bad driver transistor, although you may have a bad output as well.

I love the Scott 382 (AM/FM version) and 342 (FM only version) receivers. These were among the very first all solid state Scott units and they have the great Scott sound in spades. I have recapped my unit (342) and use it as my daily driver in my "office" set-up where it has been is daily use for several year now.

My advice, repair and recap the unit and then pinch yourself over your good fortune in picking up a fine unit for a great price.
__________________
Round and Round it goes
Reply With Quote
  #3  
Old 09-03-2006, 12:25 PM
Goldenvoice's Avatar
Goldenvoice Goldenvoice is offline
AK Member
 
Join Date: Sep 2006
Location: Pacific Wonderland
Posts: 109
Thanks for the quick reply!

I have to admit, I have yet to re-cap a unit myself - I've spent years doing my own mechanicals - i.e. - cleaning controls - replacing belts, etc.

What does an amature like myself (read 41, +22 years Prof Musician) need to get started in such an endevor? I've been soldering since my mom bought me my first set-up when I was in the 3rd grade - it's the electronic circut thing that's new...

Anyway - Is there a basic on-line site/class for acquointing ones self with transistor/cap testing, required equiptment, etc????

Also, any idea of the wattage output?

Thanks again, G
Reply With Quote
  #4  
Old 09-03-2006, 12:32 PM
tcdriver's Avatar
tcdriver tcdriver is offline
AK Member
 
Join Date: Aug 2003
Location: Valley of Heart's Delight
Posts: 3,702
Scott 382

Power output is about 20 W/Channel. There is a review of the Scott 382 in the January 1967 issue of High Fidelity magazine.
__________________
Round and Round it goes
Reply With Quote
  #5  
Old 09-03-2006, 01:15 PM
mhardy6647's Avatar
mhardy6647 mhardy6647 is offline
AK Member
 
Join Date: Sep 2002
Location: New England
Posts: 44,367
Is the 382 a quasi-complementary design? I know some if not many of the early SS Scotts were quasi-complementary.

http://www.lacieg2s.ca/w3terra/ols/scott260.htm
http://www.lacieg2s.ca/w3terra/ols/scott342C.htm

(FWIW, I've never quite figured out whether the "Audion" website content is straight-faced or satire. Joe Rosen was involved!)
__________________
Preamps need drive, not gain. - G. Kaufman
Reply With Quote
Audiokarma
  #6  
Old 09-03-2006, 04:44 PM
Brudha's Avatar
Brudha Brudha is offline
Shania before Mark Twain
 
Join Date: Oct 2005
Location: MN
Posts: 1,861
Pics

Couple snaps of my 382-B:
Attached Images
File Type: jpg Scott 382-B Front.jpg (72.5 KB, 117 views)
File Type: jpg Scott 382-B Inside.jpg (166.8 KB, 106 views)
Reply With Quote
  #7  
Old 09-04-2006, 11:27 PM
tcdriver's Avatar
tcdriver tcdriver is offline
AK Member
 
Join Date: Aug 2003
Location: Valley of Heart's Delight
Posts: 3,702
Quote:
Originally Posted by Goldenvoice
What does an amateur like myself (read 41, +22 years Prof Musician) need to get started in such an endeavor? I've been soldering since my mom bought me my first set-up when I was in the 3rd grade - it's the electronic circuit thing that's new...
Knowing how to solder is a good first step. Repairing the Scott 382 is made easier by the fact that all the audio signal path transistors are in sockets. That means that removing and testing the transistors is relatively easy. First, get a service manual. Second, obtain a multimeter. This will allow you to check many of the components (resistors, transistors and to a certain extent capacitors). I think that a search on this forum will turn up information on how to test the transistors.

Quote:
Originally Posted by Goldenvoice
Anyway - Is there a basic on-line site/class for acquainting ones self with transistor/cap testing, required equipment, etc???
I would start a new thread with this question. I do not have a ready answer, however, there are others on this forum that will.
__________________
Round and Round it goes
Reply With Quote
  #8  
Old 09-05-2006, 11:33 AM
Fred Longworth's Avatar
Fred Longworth Fred Longworth is offline
audio fanatic
 
Join Date: Feb 2006
Location: San Diego
Posts: 3,473
As I recall, the power amp board has a number of coupling and bypass electrolytics that are black or very dark gray in color. THESE FAIL and should be replaced.

If the channel is not blowing fuses but is getting very warm, yes, you likely have a leaky driver driver transistor (drives the base of an output transistor.) You should also check the trimmer potentiometer that sets the idling current.

Fred Longworth
__________________
We accept ship-in repairs -- e.g. Marantz, McIntosh, Pioneer, Yamaha.

Classic Audio Repair
Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 01:37 PM.



Friends of Audiokarma
We appreciate your help in keeping this site going.
Stereo Repair World
Herbies Audio Lab
Vintage Home Audio
Amps and Sound
Pro DJ Headphones - click here
Organ Donor Parts
Wargos Electronics
Parts Connexion
Sonneteer
Take Five Audio
Sound Stage Direct
Audio Salon
AudioClassics
Audience AV
AV Solutions
Simply Speakers
Tone Arm Audio
BD Enterprise
Musical Paradise
Howard Products
Classic Sound Repair
FM DX Antenna
McIntosh Cabinets
Siliconray
BOI Audio Works
Vinyl Magic Record Cleaner
Amplifiedparts
Grant Fidelity
RSL Speakers
Yesterday's Audio
Urban Antigue Radio
DeWick Repairs
Many Moons Audio
Vintage Electronics Repair
The Tube Store
Politicalchat.org
Audio Doctor
Antique Radio Classifieds
MCM Electronics
Videokarma.org
   
   
Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
ęCopyright 2002-2014 AudioKarma.org, All rights reserved.