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MTX TA7801 repair
MTX TA7801 repair
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Old 30th January 2009, 11:59 PM   #101
intensem1rider is offline intensem1rider  Canada
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Join Date: Dec 2007
ok great, i'll update once the parts arrive in a week and I get a chance to install/test.

Your a great help Perry!

P.S. Is there a cheap oscilloscope you would recommend I look for used on e-bay? I would like it for amplifier repairs, and for lab's for school.
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Old 31st January 2009, 12:19 AM   #102
Perry Babin is offline Perry Babin  United States
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Location: Louisiana
Email me with the auction numbers for scopes you're considering.

babin_perry@yahoo.com


Try to find a Tektronix 465 or a 465B. The 2200 series Tek scopes are also a good choice. The 453 is a good scope but some people don't like the small display.

Don't consider any scope unless it shows a bright clear locked waveform or unless it has a warranty.
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Old 31st January 2009, 02:01 AM   #103
intensem1rider is offline intensem1rider  Canada
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ok, i'll keep my eyes peeled for those once I save up enough money for one. Thanks!
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Old 31st January 2009, 02:10 AM   #104
Perry Babin is offline Perry Babin  United States
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Join Date: Nov 2003
Location: Louisiana
C1:
http://sigma.octopart.com/16398/data...-SST111-T1.pdf

The following is a similar jfet in good working order:
http://www.bcae1.com/temp/IMG_6007.jpg
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Old 31st January 2009, 03:01 PM   #105
intensem1rider is offline intensem1rider  Canada
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I think im going to order a MMBF4091, it seems to be the closest match to the sst111-t1 that I could find on Mouser.com
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Old 31st January 2009, 03:03 PM   #106
Perry Babin is offline Perry Babin  United States
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Why are you going to replace the original one?
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Old 31st January 2009, 03:05 PM   #107
intensem1rider is offline intensem1rider  Canada
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Just as spares, they are only 20 cents
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Old 26th February 2009, 09:44 PM   #108
nismo542 is offline nismo542  United States
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not trying to thread jack but in the second post of this thread an MTX7801 folder was mentioned. how can i get to this folder. i have a 7801 that i am working on.

thanks
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Old 1st March 2009, 04:52 PM   #109
intensem1rider is offline intensem1rider  Canada
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Join Date: Dec 2007
Quote:
Originally posted by nismo542
not trying to thread jack but in the second post of this thread an MTX7801 folder was mentioned. how can i get to this folder. i have a 7801 that i am working on.

thanks

You need to purchase Perry's amplifier repair tutorial CD.
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Old 1st March 2009, 07:27 PM   #110
intensem1rider is offline intensem1rider  Canada
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Well I received the parts and got the amp up and running again. I piggy backed a 3 watt 15V zener with the zener that is already in the +15V supply section, replaced the opamps, and some 10 ohm resistors up on the x-over board.

Now with me lightly running it and checking temperatures on the amp the 15V zeners are running over 150 degrees and the opamps are running over 170 degrees. Is this normal? Or is there something else I should be looking out for?
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