Iam repairing a Bass two, PS damaged. Drivers are A1715 and c2814.
Each pair drives 9x IRF064N.
I have only BDA 139 and 140...only 1,5Amp curent. Can i take them? The Original can handle 2 Amps..
Each pair drives 9x IRF064N.
I have only BDA 139 and 140...only 1,5Amp curent. Can i take them? The Original can handle 2 Amps..
Hello again,
i think i made a mistake... The A1715 is a darlington Transistor with 5 Amps, the MJE has only 3 Amps....cant find so many transistors with the same package and as darlington. Its only for drive the PS Fets...maybe somebody has an alternative, or can i use the MJE? Will the withstand the current?
i think i made a mistake... The A1715 is a darlington Transistor with 5 Amps, the MJE has only 3 Amps....cant find so many transistors with the same package and as darlington. Its only for drive the PS Fets...maybe somebody has an alternative, or can i use the MJE? Will the withstand the current?
Is the drive circuit a standard EF pair?
What's driving it?
I don't see the need for darligton transistors.
What's driving it?
I don't see the need for darligton transistors.
That's a lot for a 494 to drive. What's the pulldown resistor value on terminals 9 and 10?
What about any of these:
TO-126 Darlington Transistors Darlington Transistors | Mouser
On an amp like this, can you charge enough to justify warrantying it if the owner blows it after you repair it?
What about any of these:
TO-126 Darlington Transistors Darlington Transistors | Mouser
On an amp like this, can you charge enough to justify warrantying it if the owner blows it after you repair it?
Pin 9 180Ohm
Pin 10 173 Ohm
ist for a friend of me...So its nearly only the coast of parts....What whould be a normal Charge?
Pin 10 173 Ohm
ist for a friend of me...So its nearly only the coast of parts....What whould be a normal Charge?
I don't know but for many of the larger amps, I know other shops were charging $400-500 to repair the amps. Most quit taking them after a while because they didn't want to have to deal with warranty repairs on those amps. I would not take in amps like this except for a few possibly to learn what I wanted to know. My customers would become violent if I didn't warranty their stupidity/ignorance so I avoided large amps that would cost more than about $150 to repair. About $40-50 of that would be parts.
For all of those FETs and the 494 with 180 ohms of pulldown, it's probably best to stick with darlingtons.
For all of those FETs and the 494 with 180 ohms of pulldown, it's probably best to stick with darlingtons.
Ok,,, i will have a look for that darlington.. In USA the repair is almoust cheaper than in Germany... They would take only for the PS repair of that size about 500-600 Euro, without warranty..
Without a warranty wouldn't be possible with my customer base. The replacement of all of the tires or windows on my vehicle would cost more than to do the warranty.
I think i will take Tip 120...it has antoher case TO 220AB, but thats a few, that can handle 5 Amps... I think the 100V are not so important. Lower value would be also ok,
Ok,,, in germany they are not so violent...They would shout you on the phone, or take a lawyer...thats mostly all...
So, i received the original transitors from Vibe. They were bery helpfull.
Now another Problem.
Renewed the Audio Section. Everything fine, amp plays music. But, when i switch the amp off, and in a short time on again, it blows a bank of fets in the output, also one IRS21844s is open. Happened two times now. Iam going to take out all fets aggain for recheck, but maybe somebody had this problem allready and know what to do?
Now another Problem.
Renewed the Audio Section. Everything fine, amp plays music. But, when i switch the amp off, and in a short time on again, it blows a bank of fets in the output, also one IRS21844s is open. Happened two times now. Iam going to take out all fets aggain for recheck, but maybe somebody had this problem allready and know what to do?
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Does the rail voltage build completely before you get r-r oscillation, like this:
http://www.bcae1.com/temp/ampstartup01.mkv
http://www.bcae1.com/temp/ampstartup01.mkv
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