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Old 11th December 2020, 03:09 PM   #51
Piersma is online now Piersma  Netherlands
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Ebay offers some nice original (old stock) matched transistors.
I have used and experimented with different duals in the Ulti Amp.
The 2N2920 works fine, just as others..
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Old 11th December 2020, 03:55 PM   #52
Tailgunner is offline Tailgunner  Belgium
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Quote:
Originally Posted by Piersma View Post
Ebay offers some nice original (old stock) matched transistors.
I have used and experimented with different duals in the Ulti Amp.
The 2N2920 works fine, just as others..
Thanks for the tip, that will settle it as a replacement for the 2N2914.
What would be your favorite replacement for the BFX36 (preferably NOS).
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Old 12th December 2020, 11:11 AM   #53
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That would be the 2N3806
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Old 27th March 2021, 11:09 PM   #54
Tailgunner is offline Tailgunner  Belgium
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I have had a look at the component layout (p.74 -elektuur 12/92) and it looks to me that diode D8 has the wrong orientation. On the layout there is a trace that runs from the anode of D8 to pin 2 of IC3. I think the trace should run from the cathode of D8 to pin 2 of IC3 according to the schematic.
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Old 29th March 2021, 06:07 PM   #55
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Default Swapped

Part numbers of D7 and D8 are swapped on the silkscreen printed in Elektor february 1994.
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Old 29th March 2021, 11:11 PM   #56
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Are there other mishaps in the final PCB/schematic. I tried to look up a 'lek van elektuur' voor this amplifier but I came out empty handed.
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Old 30th March 2021, 12:21 PM   #57
Piersma is online now Piersma  Netherlands
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Not that I am aware off.

The best thing to do would be a redesign of the original PCB.
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Old 2nd April 2021, 09:59 PM   #58
Tailgunner is offline Tailgunner  Belgium
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Some more pics......
Could you send a large image of this photo?
What kind of fuses did you use. The 6.3 amp car fuses are unobtainable.
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