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Old 19th November 2013, 12:53 PM   #1081
Salas is offline Salas  Greece
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Take the chassis to IEC mains grounding wire away from the toroidal's screw. Use a dedicated chassis mounting point for it. 50VA toroid will be fine for your setting while 80VA will be rich enough if you feel like overspecifying it.

How you can measure output offset if the output relay makes no contact for instance? Impossible. Maybe you used latching type relays? Correct type is Ea2-12NJ
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Old 19th November 2013, 01:02 PM   #1082
Salas is offline Salas  Greece
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Also make continuity tests in case you switch in some other input from the one you expect by some mistake in the control switch's wiring. Or it does not allow to engage at all for some reason.
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Old 19th November 2013, 01:55 PM   #1083
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Thanks, Salas.

I have NEC EA2-12NU. It is non latch tipe, but leg 1 is + , like in the picture.

+
1 2 3 4 5
10 9 8 7 6

Is it true, that on the bord for this configuration of pins, leg 10 is + .

matjaž
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Old 19th November 2013, 03:29 PM   #1084
Salas is offline Salas  Greece
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By top view the board is having the +mark on pin 1.
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Old 19th November 2013, 04:00 PM   #1085
Salas is offline Salas  Greece
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Did you jumper the "note" pads by the way? Can you find about +12V on pin 1 of the input relays? Are the diodes next to them correctly orientated?
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Old 19th November 2013, 07:20 PM   #1086
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Salas thank you for your coatching. I just found the mistake. I did not solder one pin in the input relay. Output relay is working properly so that the offset is just that i wrote. Must i make some rekonfiguration of jfets.

At first sight DCB1 is a hugh difference versus my old preamplifier. Tomorrow I will better describe my opinion.

Salas, thank you.
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Old 19th November 2013, 08:07 PM   #1087
Salas is offline Salas  Greece
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Well done.
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Old 21st November 2013, 03:09 AM   #1088
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Opinion, which I promised. My system now consists of:
Mac mini with iPad Remote
Arcam RDac
DCB1 before Valve Preamplifier
MiniDSP
One chanel 2x monoblocs Pass F5 (total 4 x monoblocs F5 and 2x monoblocs Zen V4)
OB, U and H frame (15 kombination)

Gaina is just enough (i have 20k potentiometer, which is completley open, I think to cahange it for resistors but I need DCB1 also for phono)

The sound has a better resolution, a better stage and better bass. I think I've come up with DCB1 to the end of my DIY boundaries.


Matjaž

Last edited by submat50; 21st November 2013 at 03:11 AM.
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Old 21st November 2013, 03:32 AM   #1089
Salas is offline Salas  Greece
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Congratulations.
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Old 27th November 2013, 10:42 PM   #1090
auxie22 is offline auxie22  Australia
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I plan on building the B1 and the Aleph J and possibly eventually the F5 I found what looks to be legitimate matched 2SK170 GR's from ebay.

http://www.ebay.com.au/usr/lady.twilight

I might buy some and do testing seems pretty cheap too

by the way better to copy the link and paste it into your browser

Last edited by auxie22; 27th November 2013 at 10:47 PM. Reason: link not working
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