Threshold Amplifier - Overview and Schematic Collection of all Models

[ADH]

Threshold SA/11m

Sorry for the second post doubled. Get a failure message and thought it didn't work 🙂

 

[wintermute]

fixed 🙂

 

[Zen Mod]

change something in signal wiring , or change something in mains cables - find a way to break safety earth for , say, monos

use either cables without safety earth wire , or T adapters without the same

be aware that you can use that trick only when everything is connecetd , so amps without safety gnd connected through mains cables are effectively having safety gnd through signal cables

pretty much normal thing in PA gear , most amps having switch on back side for several arrangements of safety gnd

 

[RobertS61]

Possibly a groundloop.
Try to ground only the pre-amp and keep the rest floating.

Nice setup by the way.

 

[Zen Mod]

I did replied in other thread you posted

 

[ADH]

Thank you, I try first with some isolating material between plug and socket earth wire of the amps. I'll keep you informed

 

[Nelson Pass]

When you start multi-amping, noise generated by ground loops starts to
rear its ugly head. Most often the loop is in the AC Earth connection, so
that is a good place to start. I usually isolate the AC Earth on various
pieces to see how it affects the noise and proceed on that information.

 

[ADH]

Hallo Mr. Pass,

thanks for your response. I‘m not sure about the wording, is this platelelet (metallstrip can be seen in the front of the picture, the ac earth (or ground)?

Hope the upload works

 

[kevd]

S/450e Schematic or Service Manual

Hi,
I found this thread in a search for S/450e schematics. I'm looking at buying one and wanted to have the schematics like I do for all my equipment. Can anyone tell me where to get these?
Thanks,
Kevin

 

[Zen Mod]

check in my blog (see sig)

 

[tiefbassuebertr]

this is question for Pass himself ..... I don't have any schematic for T400

as far as I can see , T400 is made 1998 , while Pa left Treshold year before ....

so - that's probably why I don't have schematic

edit: yeah , as usual , while I was typing ...... 🙂

maybe on the former condition of the pages the wanted schematic is present as pdf file (checking out needs time unfortunately):
Wayback Machine
Wayback Machine
Wayback Machine

Thank you, I try first with some isolating material between plug and socket earth wire of the amps. I'll keep you informed

any news?

 

[kevd]

check in my blog (see sig)

Thanks, is it in there somewhere? I went through all of the "treasure" pages and couldn't find anything on the S450e.
Kevin

 

[kevd]

Universal FEB

Does anyone have the BOM for the FEB used on the S350e/450e etc? I have not been able to find a list of all the components used on this board anywhere.
Thanks,
Kevin

 

[elwood625]

Here is what I have, don't know if this helps or not. I don't know if the FEB is the same for preamps and amps. I have a FET 10 Pe, and I have collected schematics over the years of ownership, including the original owners manual which shows the DIP switch settings for the "e" model.

 

[kevd]

Thanks Elwood, I have the schematic for the boards, I need the parts list that goes with the FEB for the e line amplifiers. What you have above is for the preamps.
Kevin

 

[dimitri]

Hello, can anyone help with SA/6e schematic or required bias level - one monoblock is warm, another is extremely hot :-( Thx!

 

[baeijsman]

@dimitri

From official papers:

 

[dimitri]

thank you!

 

[ADH]

Hello everybody,


have the same problem with my SA/11m (similar to SA/10e). Can anybody describe the adjstment procedure?


Thanks a lot


André

 

[Zen Mod]

open dedicated thread , post pictures and everything you have of documentation

frankly , I'm sorta lost in all files Treshold ....... simple too many of them