Senior Member
Location: Athens
Posts: 269
I'm Dimitris.
Yes, the focus dot keeps going back and forth at 35rpm. Something like 3-4 times a sec. At 45rpm it seems more stable.
I found some time to strip some more parts today. I was not in the mood to test things. I just did some mindless desoldering (BTW I love my desoldering gun)
Here is a shot of the pcb now.
DSCF1338.jpg
The regulators at the back are not used anymore. Just the one on the left. I need to do something about those big caps too...
Last edited by dimkasta; 26-01-2017 at 23:51.
Sources: Modified SL1200 MK2, Salas folded RIAA, Phonoclone, VSPS, Shelter 501 MK2, Modified Pioneer P6D6 as transport, Shigaclone transport, Peter Daniel NOS DAC.
Amplification: Custom 211 Monoblocks, Electrocompaniet AW120, Audio Research VS110, Gainclone
Loudspeakers: Tannoy Turnberry, PBN Montana EP Signature
Cables/stands: Tempflex ribbon and Twinax cables
Other: Promitheus Signature Passive Attenuator, Custom JFET - transformer preamp.
Senior Member
Location: Ayrshire, Scotland
Posts: 232
I'm Ian.
Trying to nail what could be causing your oscillation issue. Frustrated by not having enough info on the inards of the 6680
What you have done should have worked
Hope you find the gremlin soon- I want to mod one of my deck to "bare bones" mode
Technics 1200 tweaked,Ianmac Bearing,DACT DIY Phono Pre, Belcanto CD-2, Engineered Switzerland DIY Renderer, Benchmark DAC2, Hypex NCore, ATC SCM40
2nd system --Engineered Switzerland DIY streamer, Sony CDP11,Topping D50 DAC, Hypex NCore. Kef 1point2 speakers. Ianmac Filters
Senior Member
Location: Athens
Posts: 269
I'm Dimitris.
Hopefully it won' t be the FG ransistor that was fried...
I have a second unmodified pcb I could use as a donor, but I would like to keep it functional.
Perhaps a nice opportunity to find alternative transistors to avoid paying any more silly money. Perhaps bc550 or something with lower noise
Sources: Modified SL1200 MK2, Salas folded RIAA, Phonoclone, VSPS, Shelter 501 MK2, Modified Pioneer P6D6 as transport, Shigaclone transport, Peter Daniel NOS DAC.
Amplification: Custom 211 Monoblocks, Electrocompaniet AW120, Audio Research VS110, Gainclone
Loudspeakers: Tannoy Turnberry, PBN Montana EP Signature
Cables/stands: Tempflex ribbon and Twinax cables
Other: Promitheus Signature Passive Attenuator, Custom JFET - transformer preamp.
New Member
Location: Netherlands
Posts: 26
I'm Coen.
If the dots move, the strobe is stable so you can rule out the x-tal and the logic part of the 6680. My guess remains it is some component in one of the filterpath. I see you swapped some of the caps. Are they all fixed?
Senior Member
Location: Athens
Posts: 269
I'm Dimitris.
Yes, everything is soldered. My first candidates are a few caps that are rated at 25V. Although all of them are ok visually.
Sources: Modified SL1200 MK2, Salas folded RIAA, Phonoclone, VSPS, Shelter 501 MK2, Modified Pioneer P6D6 as transport, Shigaclone transport, Peter Daniel NOS DAC.
Amplification: Custom 211 Monoblocks, Electrocompaniet AW120, Audio Research VS110, Gainclone
Loudspeakers: Tannoy Turnberry, PBN Montana EP Signature
Cables/stands: Tempflex ribbon and Twinax cables
Other: Promitheus Signature Passive Attenuator, Custom JFET - transformer preamp.
New Member
Location: Netherlands
Posts: 26
I'm Coen.
No accidentally cut traces?
Member
Location: Minsk, Belarus
Posts: 30
I'm Valera.
Just for interest - when I recapped my SL-1200Mk2 I checked all removed capacitors and everyone has passport capacity with tolerance +5..-10% and suitable ESR (I compared ESR with new ones). However, caps should be revised first of all anyway.
Analog: Technics SL-1200MkII (RB300 tonearm, external PSU, separated power supply for all stages, improved bearing), MC Goldring Eroica LX, custom SUT 1:10, Balanced input J-FET DIY phonostage
Digital: Cubietruck (headless Debian server, i2s output, external masterclock from DAC), content on HDD. DAC: Lynx D29v4 (Altera FPGA digital stream separator, 2*AD1853, 2*3 OP42 LPF)
PA: DIY composite amplifier YES-3, schematic by Gennady Bragin
Acoustic: DIY floorstanding 3-way SB Acoustics
Senior Member
Location: Athens
Posts: 269
I'm Dimitris.
Yes I did almost the same when recaping mine. The tt was working flawlessly until I moronically overvoltaged almost everything
Sources: Modified SL1200 MK2, Salas folded RIAA, Phonoclone, VSPS, Shelter 501 MK2, Modified Pioneer P6D6 as transport, Shigaclone transport, Peter Daniel NOS DAC.
Amplification: Custom 211 Monoblocks, Electrocompaniet AW120, Audio Research VS110, Gainclone
Loudspeakers: Tannoy Turnberry, PBN Montana EP Signature
Cables/stands: Tempflex ribbon and Twinax cables
Other: Promitheus Signature Passive Attenuator, Custom JFET - transformer preamp.
Senior Member
Location: Athens
Posts: 269
I'm Dimitris.
The only trace that I cut was the supply of 6682, because I used an external reg for it. This should be rather irrelevant now?Originally Posted by Co&
What do you have in mind? Perhaps I lifted a pad and did not notice.
Sources: Modified SL1200 MK2, Salas folded RIAA, Phonoclone, VSPS, Shelter 501 MK2, Modified Pioneer P6D6 as transport, Shigaclone transport, Peter Daniel NOS DAC.
Amplification: Custom 211 Monoblocks, Electrocompaniet AW120, Audio Research VS110, Gainclone
Loudspeakers: Tannoy Turnberry, PBN Montana EP Signature
Cables/stands: Tempflex ribbon and Twinax cables
Other: Promitheus Signature Passive Attenuator, Custom JFET - transformer preamp.
New Member
Location: Netherlands
Posts: 26
I'm Coen.
Exactly!
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