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Old 27th October 2012, 07:07 AM   #11
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Someone has done a real hack job here, I have removed the gate resistors and power supply fets legs. The solder pads are in rough shape from someone over heating them. I will be able to salvage them though.

I have ordered 47 ohm 1/8 watt resistors for the p/s gates, I stock the IRF3205.

The outputs are all original and they use a IRF640N and IRF9640, there a few shorted but I stock all those.

Question is what should the transistors be that drive the power supply fets on the driver board?? Looks to be four of them and there are 4 pads. The big pad in the front looks to be nothing other than an extra pad to hold down the transistor. The 3 pads in the back are what count.

Could I use PZTA56 in place cause I am not sure what the originals are???

Could you Perry or you bl4kcw1d0w tell me what the original drive transistors are on the boards you guys have and if the PZTA56 will be a sub or do I have to go original due to pin configuration???

Next question......should I be worried about the KA7500BD IC or has it possibly survived???

I really want to get this amp going, had a few older Hifonics in the past and they were good amps. Mostly a ROckford fan but I do like the older Hifonics.

Thanks........Sean
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Old 27th October 2012, 11:12 AM   #12
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They are marked BE which should be a 2SB1260.

The PZT transistor is larger.

The driver IC generally survives.
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Old 27th October 2012, 05:51 PM   #13
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2SB1260T100Q ROHM Semiconductor | Mouser


So these would work fine??
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Old 27th October 2012, 06:48 PM   #14
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The ones you posted will work. The originals had an HFE rating of R. The Q will work. You can use either.

A couple of notes...

It's really not a bad idea to have those transistors off of the board. The boards are not very high quality and will burn badly many times (as was shown in the thread for the link I posted).

You probably know this but the 7500 is the same as the TLx94 so it if you ever need to replace one, you'll likely have a replacement in stock.
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Old 27th October 2012, 10:21 PM   #15
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Ok thanks Perry Mouser does have the "R" in stock as well. Which one is heavier duty?

Next question...would the bd140's I ordered work for this application?

Yes I have many tl494 in stock thanks for the info as I did not know they were the same.
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Old 27th October 2012, 10:40 PM   #16
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The BD140s would work but they're a bit heavy so you'd want to support them in some way.

The R-Q-P HFE is the DC gain of the transistor. All are rated the same otherwise.
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Old 27th October 2012, 11:11 PM   #17
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OK do you have another recommendation as a sub that is light weight with long legs such as the MPSA56 would have that I could solder to the driver board?
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Old 27th October 2012, 11:33 PM   #18
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The A56 will work but you'll have to twist the legs to make them work. If you plan on using these as permanent replacements, I'd suggest cleaning the through-hole for the collector and inserting the collector leg through the hole (soldering on both sides of the board).

If you want to use the BD140s, scrape a strip of solder mask from the back of the board. Fold the collector leg over the board and solder it down. You'll still need to insert a wire through the hole for the center leg of the original transistor to make sure that you have a good connection to the ground on the back of the board.
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Old 28th October 2012, 12:43 AM   #19
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Twisting the legs will give me a ECB configuration instead of a EBC configuration?
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Old 28th October 2012, 12:50 AM   #20
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Correct.
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