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Sphinx project 4 service/repair manual
Sphinx project 4 service/repair manual
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Old 13th October 2019, 04:06 PM   #1
theotdf is offline theotdf
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Default Sphinx project 4 service/repair manual

Hello dear tube public,.. Can someone help me with a Service/Repair manual of a Sphinx project 4 (four) MK3 pre amplifier?


I would be very grateful
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Old 13th October 2019, 04:31 PM   #2
kevinkr is offline kevinkr  United States
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Sphinx project 4 service/repair manual
Moved to Tubes & Valves
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Old 29th October 2019, 02:24 PM   #3
jfetter is offline jfetter  Costa Rica
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Sphinx project 4 service/repair manual
I would like to see it too.
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Old 29th October 2019, 02:59 PM   #4
Lampie519 is offline Lampie519  Netherlands
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Do you have a picture of this amp (the boards)?
I maybe have some boards laying around, so i could check or reverse engineer the schematic.
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Old 29th October 2019, 04:33 PM   #5
jfetter is offline jfetter  Costa Rica
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Sphinx project 4 service/repair manual
There is a version 1 and 2 but for study purposes does not matter.
Thanks for looking.
Attached Images
File Type: jpg Sphinx-inside-medium.jpg (692.7 KB, 48 views)
Attached Files
File Type: pdf Sphinx v2.pdf (701.5 KB, 14 views)
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Old 29th October 2019, 07:26 PM   #6
Lampie519 is offline Lampie519  Netherlands
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These boards are not the same. Probably mine are older (much older). Anyway these are simple triode stage with a solid state buffer. The sound is a bit dull, that’s why i have the boards as the amp has been rebuild with a full tube version. I will check anyway what i can find for you.
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Old 29th October 2019, 11:52 PM   #7
jfetter is offline jfetter  Costa Rica
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Sphinx project 4 service/repair manual
Yes I built a few hybrids sounding same dull.
The fix is very simple. Adding one resistor and move one trace.
Then sounds like SET.
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