Any one know the part number for the PS FETs?
Also the value for the gate resistors and the value for R251?
Also the value for the gate resistors and the value for R251?
Contact MTX if no one can help.
If MTX won't help, post a photo of the board and it's likely that we will be able to find usable replacements.
If MTX won't help, post a photo of the board and it's likely that we will be able to find usable replacements.
I don't have anything on this amp. You should at least try to get the information from MTX if no one else has specific information.
I don't know what the original FETs were. You could probably use the IRF3205. The gate resistor in many similar amps is a 39.2 ohm but it's not really critical. You could use something slightly lower in value (and may need to use something lightly lower with the 3205s).
It's strange that the PZTA06s failed. The current through them is limited by the fans. Do the fans function normally if you apply 12v to them?
I don't know what the original FETs were. You could probably use the IRF3205. The gate resistor in many similar amps is a 39.2 ohm but it's not really critical. You could use something slightly lower in value (and may need to use something lightly lower with the 3205s).
It's strange that the PZTA06s failed. The current through them is limited by the fans. Do the fans function normally if you apply 12v to them?
I sent them an email.
The PZTA06 was not replace,the previous person just re solder them.I will test fan tomorrow .
So R215 in front of the PZTA06 looks like it was the same with R250.What you think?
The PZTA06 was not replace,the previous person just re solder them.I will test fan tomorrow .
So R215 in front of the PZTA06 looks like it was the same with R250.What you think?
R250 and R251 may be the same. They're not critical. Did the resistor burn or did he accidentally heat it when resoldering the terminals of the transistors?
I didn't notice that the tab hadn't been resoldered.
I didn't notice that the tab hadn't been resoldered.
3205s with 22ohm gate resistor installed, amp power up and idle ok.It produce clean audio but there still a problem.If i set gain to half way there is a pluse of DC going to the speaker causing it to push the cone way out.It happens so fast the meter does not have the time to capture the voltage.If i set gain back down to like 1/4 and i increase the input signal i don't see the problem.
The 10ohm resistor on the pre-amp board test ok.Two of the op-amps on the pre- amp board show voltages on most of the pins but i think they control the LEDs circuit.The rest i see no offset.Any ideas on this one?
no reply from MTX yet
The 10ohm resistor on the pre-amp board test ok.Two of the op-amps on the pre- amp board show voltages on most of the pins but i think they control the LEDs circuit.The rest i see no offset.Any ideas on this one?
no reply from MTX yet
Attachments
Is your signal source grounded to the same 12v power supply as the amp?
It's the weekend. MTX isn't likely to reply until Monday at the earliest.
It's the weekend. MTX isn't likely to reply until Monday at the earliest.
From MTX
R111: RESISTOR 61.9 1/10W 1% SMD 080
R251: RESISTOR 0 1/10W 1% SMD 0805
MOSFET N CHANNEL 75339 TO 220A
I went through the amp today but still could not get the fault.The fault is more visible when the crossover is set to LPF
R111: RESISTOR 61.9 1/10W 1% SMD 080
R251: RESISTOR 0 1/10W 1% SMD 0805
MOSFET N CHANNEL 75339 TO 220A
I went through the amp today but still could not get the fault.The fault is more visible when the crossover is set to LPF
Do either of you know what the on / off switch for the boost would be found called to get another on
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