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Old 17th April 2013, 01:11 AM   #1
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Default Volfenhag ZX 5168

This amp uses SFP50N06 in the PS and D998/B778 for the outputs.

I found the RFP50N06 (click) can I use these?

Where can I get the D998/B778 or is there a good sub?

Thx!
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Old 17th April 2013, 09:40 AM   #2
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Still can't locate 2SD998 or 2SB778's. Even Octopart.

All transistors.com doesn't really show much for a substitute. Might have to order from ebay. Hope they have 6 each that are the same lot.
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Old 17th April 2013, 09:52 AM   #3
ultra is offline ultra  Greece
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I know they are not "direct" replacements, but i ve been very successful using TIP35s and 36s with thermal pads.
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Old 17th April 2013, 02:26 PM   #4
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thats because they are KTD998 and KTB778. Korean garbage :-)
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Old 17th April 2013, 10:52 PM   #5
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Ultra - did you have to change any other components in the circuit? I have some 35/36's sitting here
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Old 17th April 2013, 11:05 PM   #6
ultra is offline ultra  Greece
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No, these are class B amp circuits, there is no Vbe multiplier.
I pushed them to the limit (and beyond) before giving back them to the customer.
Dont forget to use insulation as the TIPs have metal tab.
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Old 18th April 2013, 12:13 AM   #7
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Awesome thx. This is the first Volfenhag amp I've worked on. I have some insulators... but have a lot of Kapton tape. I've used it with 35/36's before. Or should I use thicker insulators?

Last edited by Deadly Sones; 18th April 2013 at 12:36 AM.
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Old 18th April 2013, 09:44 AM   #8
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The TIP transistors often require that the bias circuit be modified to prevent thermal avalanche at or near thermal shutdown.

The FJA4213 and FJA4313 are generally drop-in replacements that require no modification.
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Old 18th April 2013, 10:01 PM   #9
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OK thx guys. I still have to order the 4213/4313's for the lanzar so I'll get more for this amp as well.

Last edited by Deadly Sones; 18th April 2013 at 10:08 PM.
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Old 23rd April 2013, 05:42 PM   #10
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Amps all repaired and working great thanks guys.
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