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Old 10th October 2010, 09:39 PM   #1
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Default Threshold Amplifier - Overview and Schematic Collection of all Models

A friend of me will start a collection of all exist Threshold models - at least of all exist power amplifiers.
This brings me to the idea, to start this thread with an information collection with a listing of (first only all me known) models and miscelaneous parts/PCB's.

please help me to complete this list - there are probably missing a few models, especially the universal PCB names of various modules and special/custom made parts used in various amp models (eg front-end, VU-Meter PCB).Thank you therefore.
In the next time I will also redrawn those circuit diagrams, where the original schematic documents are difficult to read.

Most listed models I have found about
Threshold-Audio.com

First Series:
800A 200 Watt/Channel STASIS Stereo Power Amplifier (1975-77)
800S ???? unknown
400A 100 Watt/Channel STASIS Stereo Power Amplifier (1976-79)
4000 200 Watt/Channel STASIS Stereo Power Amplifier (1977-79, successor 400A)
800A Schematic
Threshold 800A and 800S
Threshold 800A Help!
Threshold 800A and other old models: Mospec 2N5876/2N5878 or ON MJ21193/MJ21194 ?
Threshold 800A assistance
400A or Stasis 3?
Threshold 400 a
Threshold 400 A
Buying a 400A
Would this work with a 400a?
Threshold 400A HELP !!
Threshold 4000
Threshold! (4000 vs 800A)
Threshold (4000 400A CAS1)
Elettronica audio - (a cura di Piercarlo Boletti): QUAD 405 - 2 - Seconda parte (800A - high resolution schema, scroll down)
Threshold 400a Parts Substitution & Mods.
Threshold 400A Power supply help
AudiogoN Reviews: Threshold 400a Amplifier (photo)

Cascode Amplifier (CAS) Series (Emitter Cascode Follower as Power Buffer)
CAS-1 75 Watt/Channel STASIS Stereo Power Amplifier (1979-81)
CAS-2 125 Watt/Channel STASIS Stereo Power Amplifier (1979-81)
THRESHOLD CAS-2 poweramp.
Threshold CAS 1
Threshold (4000 400A CAS1)

Stasis-Series:
STASIS-1 200 Watt STASIS MonoBlock Power Amplifier (1979-81)
STASIS-2 200 Watt/Channel STASIS Stereo Power Amplifier (1979-81)
STASIS-3 125 Watt/Channel STASIS Stereo Power Amplifier (1979-81)
SA-1 160 Watt STASIS MonoBlock Power Amplifier (1984-88)
SA-2 100 Watt STASIS MonoBlock Power Amplifier (1984-88)
SA-3 50 Watt/Channel STASIS Stereo Power Amplifier (1984-88)
S/150 (two series) 75 Watt/Channel STASIS Stereo Power Amplifier (1982-84)
S/200 (two series) 100 Watt/Channel STASIS Stereo Power Amplifier (1984-86)
S/300 (two series) 150 Watt/Channel STASIS Stereo Power Amplifier (1983-88)
S/500 (two series) 250 Watt/Channel STASIS Stereo Power Amplifier (1983-88)
S/1000 (two series) 500 Watt STASIS MonoBlock Power Amplifier (1984-88)
SA/3.9e 60 Watt/Channel STASIS Stereo Power Amplifier (1990-94)
SA/4e 100 Watt/Channel STASIS Stereo Power Amplifier (1989-95)
SA/6e 125 Watt STASIS MonoBlock Power Amplifier (1990-94)
SA/10e 175 Watt STASIS MonoBlock Power Amplifier (1990-94)
SA/12e 250 Watt STASIS MonoBlock Power Amplifier (1989-95)
stasis 2 and 3 schematics
STASIS 2 problem
Stasis One Meter
Threshold Stasis 2.
Threshold Stasis 2.
threshold stasis 2
Threshold Stasis Model 3
Another Threshold Stasis 2 rebuild
Threshold Stasis 3, too
Stasis 3 Power Transistors
Threshold S/200
Threshold SA/ and SA/e series monoblocks
Stereophile: Threshold SA-1 monoblock power amplifier (SA-1)
Schematic and help with Threshold SA/4 (post #34: Instruction for bias adjust)

Threshold's New-Owner Series:
T 50 50 Watt/Channel Stereo Power Amplifier (1994-98)
T 100 60 Watt/Channel Stereo Power Amplifier (1994-98)
T 200 100 Watt/Channel Stereo Power Amplifier (1994-98)
T 400 150 Watt/Channel Stereo Power Amplifier (1994-98)
T 800 and T 800D 200 Watt/Channel Stereo Power Amplifier (1996-98)
TA-300 150 Watt/Channel Stereo Power Amplifier (1993)
S/160 80 Watt/Channel STASIS Stereo Power Amplifier (1992-94)
S/250 125 Watt/Channel STASIS Stereo Power Amplifier (1992-94)
S/350e 150 Watt/Channel STASIS Stereo Power Amplifier (1990-94)
S/450e 200 Watt/Channel STASIS Stereo Power Amplifier (1990-94)
S/550e 250 Watt/Channel STASIS Stereo Power Amplifier (1990-94)
S/1600 750 Watt STASIS MonoBlock Power Amplifier (1989-1994)
Threshold SA/2 SA/3 Soderburg site?
Biasproblems in Threshold SA/1
Schematics Threshold Series I or II
Threshold S/1000 Series II
Help! Schematic Threshold S/1000 Series II
threshold sa 50?
diyAudio

Unknown models:
500 ???
500/II ???
Threshold 500II
maybe SA-500 and Stasis 500 MK-II ??

not mentioned power amplifier models
about Threshold-Audio.com
but mentioned about http://www.audiopathways.com/Threshold.htm
preamp Stasis R 3.0 and 5.0
integrated Amp: Dragon V
5ch Power Amp: S-3500-E
Stereo Power Amp: Stasis 7.0 - Stasis 8.0 - S-5000-E
MonoBlock S-7000-E

Upgrade Kits:
???? ........................please let me know more, whether there are such kits or not.

PCBs and special parts for various models:

various protection unit's: PCB part No 254-6000
Front end modules (FE-89, FE90), Universal FEB, Universal Error Correction PCB
Universal LED Driver PCB for VU Light Band Displays (multi element bar graph array) e. g.
Electronics-Lab.com Blog VU meter
PCB for VU Light Band LED Display (multi element bar graph array)
VU Light Band VFD (Vakuum Fluoreszenz)-PCB
Analogue VU Moving Coil Panel Peak Indicator Meter
....................please let me know all the existing things - I have only found that from the attachement

Stereo Line + RIAA Preamplifier
NS-10 Stereo Preamplifier (1977-79)
Threshold NS-10 and M1 info. wanted
Threshold NS10 Lineamp PCB
SL-10 Stereo Preamplifier (1979-81)
Threshold sl-10?
threshold sl10
threshold sl-10
FET-1 (two series) Stereo Preamplifier (1981-85)
Threshold FET1
FET-2 (two series) Stereo Preamplifier (1981-85)
FET-9 Stereo Preamplifier with Phone Stage (1986-89)
FET-10Pc Stereo Phone Gain Stage (1986-89)
FET-10HL Stereo High Level Preamplifier (1986-89)
FET-9e Stereo Preamplifier with Phone Stage (1990-94)
FET-10Pe Stereo Phone Gain Stage (1990-98)
FET-10He Stereo High Level Preamplifier (1990-94)
Threshold FET/10 He Service Manual
Threshold Fet 10/hl Opinion ?
Threshold fet ten/pc schematics
T 2 Remote Control Stereo Preamplifier (1994-98)
T 3/T 3i Remote Control Stereo Preamplifier (1994-98)

crossover/DAC
PCX (-X10) Stereo Electronic Crossover (1987-89)
DAC1e Digital to Analog Convertor (1992-96)
DAC2 Digital to Analog Convertor (1995-98)

various URL's concerning Threshold devices:
Threshold Lovers - Threshold - Product line history
archiveamps
Stammtisch für HiFi- und Musik-Freunde | PASS LABS | Threshold
By Threshold history site not mentioned models: e.g. Stasis R-3.0 - Stasis R-5.0 - T Zero
Threshold Audo from AudioPathic
Attached Images
File Type: jpg ZZZ-Threshold_fe89.jpg (178.9 KB, 3106 views)
Attached Files
File Type: pdf ZZZ-Threshold univ. gain modul.pdf (90.6 KB, 367 views)
File Type: pdf ZZZ-Threshold E-Line Output Stage.pdf (82.4 KB, 300 views)
File Type: pdf ZZZ-Threshold univ. FEB.pdf (65.3 KB, 223 views)
File Type: pdf ZZZ-Threshold universal peak display.pdf (32.3 KB, 220 views)
File Type: pdf ZZZ-Thresholdpeakdisplay.pdf (37.6 KB, 202 views)

Last edited by tiefbassuebertr; 10th October 2010 at 09:51 PM.
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Old 11th October 2010, 02:04 AM   #2
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Default Threshold 800A various schemas and pics

Threshold 800A various schemas and pics and two URLs
http://www.affordableaudio.org/Threshold800A.pdf
http://cgim.audiogon.com/cgi-bin/src...threshold+800a
Attached Images
File Type: jpg Threshold 800A front left.jpg (158.4 KB, 3028 views)
File Type: jpg Threshold 800A front right.jpg (170.1 KB, 2941 views)
File Type: jpg Threshold 800A no adv. about PCB version.jpg (204.0 KB, 2951 views)
File Type: jpg Threshold 800A power meter.jpg (177.3 KB, 2889 views)
File Type: jpg Threshold 800A rear left.jpg (198.4 KB, 189 views)
File Type: jpg Threshold 800A rear.jpg (199.3 KB, 199 views)
File Type: jpg Threshold 800A rear+front.jpg (217.0 KB, 181 views)
Attached Files
File Type: pdf Threshold 800A 1975.pdf (104.8 KB, 173 views)

Last edited by tiefbassuebertr; 11th October 2010 at 02:20 AM.
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Old 11th October 2010, 02:08 AM   #3
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Default Threshold 400A various schemas and pics

Threshold 400A various schemas and pics
Threshold 400a repair
Repair question re: threshold 400a
Attached Images
File Type: jpg Threshold 400A -1.jpg (62.6 KB, 218 views)
File Type: jpg Threshold 400A high res..JPG (405.3 KB, 213 views)
Attached Files
File Type: pdf Threshold 400A no adv. about PCB version.pdf (51.0 KB, 279 views)
File Type: pdf Threshold 400A PC-400A 11-77 14B-5400.pdf (40.6 KB, 213 views)
File Type: pdf Threshold 400A-800A-4000 adjust1.pdf (13.4 KB, 181 views)
File Type: pdf Threshold 400A-800A-4000 adjust2.pdf (59.8 KB, 133 views)
File Type: pdf Threshold 400A-800A-4000 adjust3.pdf (56.9 KB, 118 views)
File Type: pdf Threshold 400A-800A-4000 adjust4.pdf (29.4 KB, 113 views)
File Type: pdf Threshold 400A-800A-4000 adjust5.pdf (24.0 KB, 124 views)
File Type: pdf Threshold 400A-800A-4000-CAS1-3-stasis 1-3 adjust6.pdf (45.6 KB, 190 views)

Last edited by tiefbassuebertr; 11th October 2010 at 02:29 AM.
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Old 11th October 2010, 02:16 AM   #4
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Default Threshold 4000 various schemas and pics

Threshold 4000 various schemas and pics
Threshold 4000
http://www.avsforum.com/avs-vb/showt...php?p=19273750
Attached Images
File Type: jpg Threshold 4000 front+top.jpg (50.1 KB, 330 views)
File Type: jpg Threshold 4000 top view.jpg (87.9 KB, 418 views)
File Type: jpg Threshold 4000 VU Meter LED.jpg (34.6 KB, 358 views)
File Type: jpg Threshold 4000.jpg (40.9 KB, 226 views)
Attached Files
File Type: pdf Threshold 4000 and 400A PCB NO 053-0308.pdf (45.0 KB, 250 views)
File Type: pdf Threshold 4000powersupply2.pdf (24.7 KB, 155 views)
File Type: pdf Threshold 4000powersupply.pdf (21.6 KB, 142 views)
File Type: pdf Threshold 4000transformer.pdf (30.9 KB, 137 views)

Last edited by tiefbassuebertr; 11th October 2010 at 02:24 AM.
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Old 11th October 2010, 11:06 AM   #5
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Default Mooved Schematic Archive from www_passlabs_com

This website was several time updated in the last ten years.

Where are presently to find follow archive sites:
Index of /np
Index of /np
Index of /np
time overview:
Internet Archive Wayback Machine

Thank you for your advices.

In the attachement the pdf file from previous post "Threshold 4000 and 400A PCB NO 053-0308.pdf" as tif-download and follow new pdf create - a bit better resolution
Attached Files
File Type: pdf Ganzseitiger Faxausdruck.pdf (172.4 KB, 271 views)

Last edited by tiefbassuebertr; 11th October 2010 at 11:23 AM.
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Old 11th October 2010, 12:40 PM   #6
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Default Threshold CAS Series - various schemas and pics

Threshold "CAS" series - various schemas and pics

CAS1 (CAS-1): schematics here:
Threshold CAS 1 (post #10)
THRESHOLD CAS-2 poweramp. (post #4 and #6)
CAS2 (CAS-2): no schematics I have found, also not from the LED VU-Peak Level meter therefore.
AudiogoN Forums: Review: Threshold CAS-2 Amplifier

I don't find complete detailled schematics about the CAS2 (CAS-2) online. Who can post that?
Attached Images
File Type: jpg Threshold CAS 2 front rear.jpg (24.7 KB, 175 views)
File Type: jpg Threshold CAS 2 front.jpg (25.2 KB, 136 views)
File Type: jpg Threshold CAS 2 front-II.jpg (24.3 KB, 135 views)
Attached Files
File Type: pdf Threshold CAS2 front.pdf (51.2 KB, 102 views)
File Type: pdf Threshold CAS2 open.pdf (135.9 KB, 82 views)
File Type: pdf Threshold CAS2 open-II.pdf (152.6 KB, 81 views)
File Type: pdf CAS2 The Audio Journal Aug.1980-1.pdf (178.0 KB, 149 views)
File Type: pdf CAS2 The Audio Journal Aug.1980-2.pdf (189.4 KB, 93 views)
File Type: pdf CAS2 The Audio Journal Aug.1980-3.pdf (175.1 KB, 96 views)

Last edited by tiefbassuebertr; 11th October 2010 at 12:45 PM.
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Old 28th October 2010, 04:16 AM   #7
edwyun is offline edwyun  United States
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I do have a copy of the Threshold service manual (PN057-00SE, Rev.B1 05/24/90) for all STASIS e-series A and AB amps. It includes schematics, parts lists, etc. A bit difficult to scan though.
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Old 28th October 2010, 09:25 AM   #8
Zen Mod is offline Zen Mod  Serbia
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you'll do great favor to community if you scan them
I'm willing to help in any way , but - I'm too far for scanning them , but I can host scans if they are large

maybe you can send them to some other USA based DIYa for scanning
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Old 28th October 2010, 02:01 PM   #9
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Who knows, where I can get detailled complete schematic from the 800A - only the power amp section I can find, but no schematics of front end (integrated pre-amp section), switch-on unit (non-contact switching resp. sensor-aera therefore) and power supplies/voltage regulators.
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Old 28th October 2010, 05:17 PM   #10
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Quote:
Originally Posted by edwyun View Post
A bit difficult to scan though.
A nice digital camera can work out well instead of a scanner and it is a lot faster.
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