Threshold Fet 10/hl Opinion ?

[ANALOG GUY]

From my remember about 1 year ago I had post...

http://www.diyaudio.com/forums/showthread.php?s=&threadid=41104&perpage=10&pagenumber=4

I found a lot of sorce of them schematic / PCB / parts, does anybody want to make them to DiyAudio Project ?

I'm notice in parallel DUAL JFET input(original are NPD5566 but I uesd 2Sk332), better than 1 pair DUAL JFET ? I can't find it's difference.

What's quality of 3N172 mosfet, Could I use BS250 insted of it ? (now I used SMD irfd 9120)

I had searched (real) THRESHOLD FET 10/HL PCB for many months, I'm very tired, Could anybody decide to work with me ?

Regard
analog guy

 

[ANALOG GUY]

Other pics

Before sucessful.
Top layer.

 

[ANALOG GUY]

Other pics

Before succesful.
Bottom layer.

 

[ANALOG GUY]

Other pics

Before succesful.
Power supply rails used MJ2955/3055 for drive current which fixed regulated voltage from 79l12/78l12 and 741 opamp (I cloned from first link)

!!! COMPLETED !!!

 

[ANALOG GUY]

What's different between Threshold Fet-10HL & E

AHHH...I seen Fet-10HL of Threshold production line

NS-10 Stereo Preamplifier (1977-79)
800A 200 Watt/Channel STASIS Stereo Power Amplifier (1975-77)
400A 100 Watt/Channel STASIS Stereo Power Amplifier (1976-79)
4000 200 Watt/Channel STASIS Stereo Power Amplifier (1977-79)

SL-10 Stereo Preamplifier (1979-81)
CAS-1 75 Watt/Channel STASIS Stereo Power Amplifier (1979-81)
CAS-2 125 Watt/Channel STASIS Stereo Power Amplifier (1979-81)
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)

FET-1 (two series) Stereo Preamplifier (1981-85)
FET-2 (two series) Stereo Preamplifier (1981-85)

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)

PCX (-X10) Stereo Electronic Crossover (1987-89)
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)

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)

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/1600e 750 Watt STASIS MonoBlock Power Amplifier (1989-1994)

DAC1e Digital to Analog Convertor (1992-96)
DAC2 Digital to Analog Convertor (1995-98)
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)

T 2 Remote Control Stereo Preamplifier (1994-98)
T 3/T 3i Remote Control Stereo Preamplifier (1994-98)
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/T 800D 200 Watt/Channel Stereo Power Amplifier (1996-98)

 

[ANALOG GUY]

This's a Threshold Fet10/HL schematic

Sorry for lowres picture (If email can be 1meg !!!)

Regard
analog guy

 

[ANALOG GUY]

This's a Threshold Fet10/HL PCBs

Sorry for lowres picture (If email can be 1meg !!!)

Regard
analog guy

 

[redwine1118]

I need some help from all members. My friend has got one threshold model FET ten/hl. The power supply is totally damage and I am planning to rebuild one for him. Anyone got a schematic?? Thanks in advance.

 

[Nelson Pass]

Sorry, I thought I had one, but can't find it.

 

[Zen Mod]

.

 

[redwine1118]

Thank you so much.

 

[redwine1118]

Thank you for the schematic. There is an individual power source unit separated from the FET10/HL, few more questions want to ask :

1) what is the +/- output voltage from the power source unit?

2) and what is the reference voltage (+/-) from the regulator board??

Thank you for your input and much appreciated.🙂

 

[Zen Mod]

according to previous posts output from reg is +/-12Vdc

you need at least 15 steady volts in all circumstances for input to reg

use 2x15Vac xformer and you're good

 

[baeijsman]

The output from the external PSU is +/- 24Vdc.

 

[Zen Mod]

yeah ...... solid fact!

shown on right side of p5 of pdf I posted

not exactly clear , but it also shows regulated rails are +/-18V , same page