Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Swap Meet Sell your stuff here, who knows, some other fanatic might be interested!

Threshold S/500 project
Threshold S/500 project
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 20th July 2019, 05:13 PM   #1
kolledog is offline kolledog  United States
diyAudio Member
Join Date: Oct 2010
Location: Bethel, CT
Default Threshold S/500 project

I'm determined to clear the shelves of projects that I am never going to make happen...

500 bux OBO

Here's a Threshold S/500 85-pound, 250WPC solid state amplifier that needs your caring touch.

Several years ago I bought this from a guy who took it to the UPS store for packing and shipping, and here's what the idiots did: They wrapped the amp in lots of bubble wrap, then put the amp in the box that the bubble wrap came in. Bubble-wrap box had something like a 20-pound burst rating. Needless to say, the amp got damaged in shipping. All the feet broke off and the top of the rear heat sinks bent. (See photos.)

The guy I bought the amp from said he'd recently replaced the big cans with what was recommended by Threshold. (Not sure what that means, but when I asked him to elaborate, he went silent.) He seems to have also done a real crappy paint job on the top cover with a paint brush (?!?!?) and some black paint.

Amp didn't work when it arrived. Still doesn't.

I took it to my friend and master tech Herb Ward. He said this, " A clueless previous owner or incompetent technician thought to upgrade this unit by installing a new set of power supply capacitors. The parts installed have a LOWER working voltage that the power supply requires. 3 of the 4 large blue caps overheated and capacitor electrolyte boiled out of the safety vents. what a sad end for these expensive cans. The driver boards are a burnt mess but interestingly I do not think any of the outputs failed. Nelson Pass sanded off all the markings on the transistors but I believe they are the complimentary pairs 2SB600 and 2SD555 made by NEC. Transformer is good."

Faceplate is in decent condition. Some scratches to the top of a handle, but you could just reverse the handle, right? A couple of the top-cover screws are stripped.

So...this is a project for one of you skilled AK techies who have always wanted a powerful Threshold amp.

I would love it if you would pick up this amp in Bethel, CT, zip 06801, but I can ship it on your dime. Figure a 24 X 24 X 14 box that weight 100 pounds.

Next Friday (July 26) I will be driving from Bethel, CT to Pittsburh NH (not PA) and could meet up along the way somewhere to hand off this beast. Two hands or more, definitely.

Make me an offer. I might just accept it...

Stay cool.


Last edited by kolledog; 21st July 2019 at 09:00 AM. Reason: trying to add photos///
  Reply With Quote
Old 20th July 2019, 06:54 PM   #2
norman bates is offline norman bates  United States
diyAudio Member
norman bates's Avatar
Join Date: Nov 2003
Location: iowa
What a sad story..............
  Reply With Quote
Old 20th July 2019, 11:10 PM   #3
carlthess40 is offline carlthess40  United States
diyAudio Member
Join Date: Oct 2017
Location: Lake Mary Florida
Can I see some pics? And what would the shipping be to zip code 32725
Deltona Florida
  Reply With Quote
Old 21st July 2019, 08:59 AM   #4
kolledog is offline kolledog  United States
diyAudio Member
Join Date: Oct 2010
Location: Bethel, CT
Shipping to FL would be about 100 - 125 bux.
I can't get photos to upload.
Send me an email to kolle1@comcast.net, and I'll send you some pix.
  Reply With Quote
Old 21st July 2019, 12:12 PM   #5
Quantensprung is offline Quantensprung
diyAudio Member
Join Date: Dec 2018
Threshold S/500 project
Really bad story.
I have a similar story with the UPS packing service. Might be off topic but I think everybody should know about this service. Iím sorry to say this but they seem to employ only, letís say less motivated people.
Iím also active in the field of precision measurements and I was really crazy volt nut. I won two auctions in eBay for the ultra stable Fluke 732A DC Reference Standard for a very good price. The seller was super friendly and after short time they arrived here in Cologne Germany. I was a bit confused when I received them as the the package were very small. After opening them, I became almost a psychotic attack. The guys from the UPS packing service, used old (at least used two times before for shipments from east to west coast, you could still see the old shipping labels) cardboard boxes that had exactly the measurements of the reference standards. For the packers this was a dream, just put the reference standard in each box, close it and put a bit of tape on them.
As you can imagine they arrived in a very bad optical and technical condition. All front contacts were broken or bent. These are all special and expensive pure copper connectors, because precision DC measurements require Low Thermal EMF connections. The rest of the enclosure was heavily dented, all feeds were broken off. A real disaster. But Fluke built these units like little Tanks, isolated from the out side. After careful inspection of the power supply and battery loader circuit including changing the backup batteries, we powered them up and they both were working perfectly, after heating up and two days of stabilization time, we started the measurements and everything thing was up to spec.
Of course I told this story the seller to just warn her, to never use again UPS packing service. I didnít asked for a refund but she was so shocked that she insisted for a almost full refund of both units.

I canít see any pictures. Can you send them also to me? I will send you an email, maybe I have a relative who can pick

Kind Regards

  Reply With Quote
Old 21st July 2019, 12:43 PM   #6
kolledog is offline kolledog  United States
diyAudio Member
Join Date: Oct 2010
Location: Bethel, CT
I think pix uploaded this time...
Attached Images
File Type: jpg IMG_3039.jpg (992.1 KB, 273 views)
File Type: jpg IMG_3040.jpg (989.0 KB, 270 views)
File Type: jpg IMG_3041.jpg (986.5 KB, 256 views)
File Type: jpg IMG_3043.jpg (709.5 KB, 251 views)
File Type: jpg IMG_3042.jpg (982.6 KB, 247 views)
File Type: jpg IMG_3044.jpg (960.0 KB, 123 views)
File Type: jpg IMG_3045.jpg (996.9 KB, 116 views)
File Type: jpg IMG_3046.jpg (692.9 KB, 102 views)
File Type: jpg IMG_3047.jpg (786.6 KB, 126 views)
File Type: jpg IMG_3048.jpg (976.1 KB, 126 views)
  Reply With Quote
Old 5th August 2019, 12:42 PM   #7
mpmarino is offline mpmarino  United States
diyAudio Member
mpmarino's Avatar
Join Date: Jun 2004
Location: Northeast USA.
PM sent
Crazy Yankee.
  Reply With Quote
Old 5th August 2019, 01:02 PM   #8
Zen Mod is online now Zen Mod  Serbia
Official Court Jester
diyAudio Member
Zen Mod's Avatar
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
Threshold S/500 project
just in case , cleanest I could find and save as pdf for best reading
Attached Files
File Type: pdf s150-300-500.pdf (94.7 KB, 42 views)
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM
  Reply With Quote
Old 13th August 2019, 06:09 PM   #9
kolledog is offline kolledog  United States
diyAudio Member
Join Date: Oct 2010
Location: Bethel, CT
  Reply With Quote


Threshold S/500 projectHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Threshold SA/4e & Threshold FET 10 hl Lars Erik Ringen Solid State 0 29th October 2013 12:53 PM
Threshold S-150 II Brent Powers Solid State 0 26th May 2011 05:21 PM
Threshold Fet One RobOnoCo Pass Labs 0 10th October 2010 10:57 AM
threshold and t.o.a.o pic Duck-Twacy Pass Labs 3 29th January 2007 10:37 AM
Threshold Fet 10 pc mach.88 Solid State 3 21st December 2005 08:57 PM

New To Site? Need Help?

All times are GMT. The time now is 12:36 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio