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Old 20th October 2006, 02:14 PM   #11
diyAudio Member
Join Date: Sep 2006
ok the 2a's do check bad but no one around me sells them and i wanna get this amp fixed and outta here my friend said i could replace the 2a's and 1a's with a regular like to-92 case if so do you know what the 2a's dross to and the 1 a's cross to like a a06 or 56 just wondering if u might know that info?? i just was wondering due to the availbility of parts and they are always fun to solder back on
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Old 20th October 2006, 02:38 PM   #12
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Join Date: Nov 2003
Location: Louisiana
I've soldered them directly to the pads but you have to be very careful. If you apply any pressure to the A06/A56 when soldered to the pads, you risk lifting the pads (very bad). I'd recommend using the correct part.

Now if you insist on doing it the wrong way...

The 1A is roughly equivalent to an A06. The 2A is roughly equivalent to the A56. Look up the datasheets for the transistor:

The pins are marked.

I'd recommend using an adhesive (Goop) to tack the to-92 case transistors to the board. From there, wire the transistor to the board with a small gauge wire. Computer ribbon cable from a 40 conductor IDE cable will work. Don't use a heavy wire. It will break the pads. Secure each wire to the board so no stress is applied to the pads.

This will work fine but if you're getting paid for this job, I'd recommend that you either tell the customer precisely what you've done or order the correct parts. If another tech pulls it apart and sees it, he's going to tell the customer that you did a poor job.
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Old 20th October 2006, 03:04 PM   #13
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Join Date: Sep 2006
hi im gonna order the right parts for it i soldered in the a56 just to see if the amp would work and it works fine but like u sais im gonna get the right parts for it thanks again
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Old 20th October 2006, 03:48 PM   #14
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Join Date: Sep 2006
i have a mtx amp im parting out and the transistors are marked 2g and 1gm are theese the same as the 1a and 2 a? just wondering if so im gonna rob the parts to fix the fosgate amp
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Old 20th October 2006, 06:04 PM   #15
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Join Date: Nov 2003
Location: Louisiana
The 'g' version is the a06/a56 transistor in the sot-23 case. The 'm' is for motorola. It's not necessary to use motorola parts. The 'a' components are mmbt3904/3906 transistors.

The 'g' components are good replacements for the 'a' components but not vice-versa.
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