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Old 8th August 2007, 11:30 AM   #1
diyAudio Member
Join Date: Jun 2004
Location: HKSAR
Default alternatives for Quad303 transistors

I wonder if any of you gurus can voucher the following replacement for rebuilding a Quad 303

1. TR105/106 BC461/441 -> 2N5415/3440 or BD139/140 (redo pcb)

2. TR101/107 BC109 -> ???

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Old 8th August 2007, 12:18 PM   #2
hd38 is offline hd38  France
diyAudio Member
Join Date: Jan 2005
Location: Grenoble
Some substitution transistors for 303

TR100 : BC154/BC560/BC214C
TR101/107 : BC109/BC237C/BC184K
TR102/103 : U17219/BC546B/ZTX304
TR104 : U17229/BC556B/ZTX504
TR105 : 39496/BC461/2N5322
TR106 : 39495/BC441/2N5320

TR1/2 (power) : 39494/2N3055/MJ15003/MJ15004

Hope this helps.
Check for mistyping !

PS: I have several of them for s... oops ... swap
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Old 12th August 2007, 01:10 AM   #3
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Join Date: Jun 2004
Location: HKSAR
Anymore suggestions ? please !
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