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Old 5th January 2010, 04:53 PM   #1
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Default Threshold T 100 schematic and service manual?

I picked up a Threshold T 100 a few weeks back and was wondering if anyone here had a Schematic and service manual for this amp? A gentleman over on the Audiogon site was kind enough to make copies of his operation manual for me but did not have the schematic or service manual.

I would be happy to pay for a copy of .pdf file of them if someone here had them. Or, maybe some direction to where I may be able to find them out there. I have been trying to locate a place to purchase on the internet but have come up empty.

Thanks, RC
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Old 15th October 2011, 05:34 AM   #2
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Default Threshold T 200 schematic and service manual

Anyone has Threshold T 200 schematic and service manual? Thanks.
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Old 2nd March 2012, 05:34 PM   #3
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Default I search T-100 schematic

Hi,
I search Threshold T-100 shematic.
Does anyone have the schematic?
thank you for your help.
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Old 6th March 2012, 05:41 PM   #4
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Don't release Threshold itself this manuals? Which reply you have get from
Threshold-Audio.com

check also out this thread:
Threshold Amplifier - Overview and Schematic Collection of all Models
and the URL
Threshold-Audio.com
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Old 6th March 2012, 06:20 PM   #5
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Death to all GT20D101/201 amps.
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Old 7th March 2012, 07:58 AM   #6
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Quote:
Originally Posted by jacco vermeulen View Post
Death to all GT20D101/201 amps.
Why that?
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Old 7th March 2012, 10:40 AM   #7
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Eeh, because the T-100 has the Toshiba GT20D outputs ?
IBGT's, Menace or Death !

First time i saw an image of the insides of the T-100, it looked as Mr Bladelius took the boards of a Forté Audio Model 1/3, adapted it for IBGT outputs (i gathered that the output stage doesn't participate in the NFB loop, feedback around the input stage sets the gain), and stuck them in a more fancy looking Threshold case.

Goggle the Forté Model 5, identical board, but only 4 of 10 seats taken.
To find the T-100 layout, find the Forté 5 schematic (likely similar story as with the Model 1 and Model 3)
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Last edited by jacco vermeulen; 7th March 2012 at 10:43 AM.
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Old 7th March 2012, 11:25 AM   #8
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are these transistors really unreliable ? Then the best way it is to replace against discrete clone of a BjT/MOSFET Sziklai (CFP Pair) with good available types.

Of course only possible if one has the necessary simulation software and experience. Additional one must be able to modify the front end for stable operating at all loads with the new output ones.

Some URLs regarding IGBT's from Toshiba:

Successors for Toshiba's IGBT's GT20D201-GT20D101 used e.g. in Elektor's CFB Amp
GT20D201 & GT20D101
WTB: IGBT toshiba GT20D201/GT20D101
Where to find GT20D201 and GT20D101
GT20D201 & GT20D101 TOSHIBA Audio High Power IGBT, x10 | eBay
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Old 7th March 2012, 01:00 PM   #9
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20A/>200V/TO247 IGBT replacements are likely easy to order and way cheaper (often sale items), but why bother ?
For Class A, just use Verticals at a buck a piece or power bipolars for two.
Even in the early '90s, the IGBT's were stinking expensive.

(Aargh, typing IBGT instead of IGBT, i'm turning dys-electric)
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