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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment. |
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15th Feb 2020, 1:44 pm | #1 |
Heptode
Join Date: Jun 2003
Location: Bristol, UK.
Posts: 900
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BD155 equivalent?
Hi - I have a Sinclair PZ6 I am trying to resurrect (to go back into a Project 60 box) and I have found that the BD155 transistor is kaput - I have a few similar transistors - BD139, BD136, BD138 - are any of these suitable as a replacement? The PZ6 is a regulated mains PSU, delivering about 30 volts to drive a stereo 60 and 2 x Z50s (all Sinclair).
This was one of the first amplifiers I built - all I could afford in the early 70's! Any advice on equivalents welcomed! Cheers Andy |
15th Feb 2020, 2:22 pm | #3 |
Moderator
Join Date: Jun 2003
Location: Oxford, UK
Posts: 27,788
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Re: BD155 equivalent?
The BD155 is a pretty bog standard Si medium power transistor. Seems to be 60V 1A, but you may not need the 60V rating if the operating voltage is significantly lower. A BD139 should be OK, but I think the others you mention are PNP.
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15th Feb 2020, 2:51 pm | #4 |
Heptode
Join Date: Jun 2003
Location: Bristol, UK.
Posts: 900
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Re: BD155 equivalent?
thanks! I'll try the BD139 - no great loss if it doesn't last - I have a few lying about in te spares box.
Cheers Andy |