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Old 25th November 2009, 07:36 PM   #531
billyk is offline billyk  United States
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12-0-12 50VA If I recall. I think it is also on the BOM
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Old 25th November 2009, 07:47 PM   #532
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Yeah, its on the BOM
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Old 26th November 2009, 01:09 AM   #533
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I've spent some time tonight listening to my DCB1. This was a direct comparison to my regular B1, with LS. The DCB1 has an ebay stepped pot, 50k.

I don't want to comment too much on the sonics as really, my DCB1 is not yet finished. I have a LS ready to go into it, and there is also the matter of upping the current through the shunts to try out as well. Theres a few other finishing touches needed as well.

The long and the short of it though is that I'm a very happy camper. It seems more dynamic than the B1, and definitely seems to have more controled bass and kick. The presentation is different too, with vocals more forward than my regular B1. Theres one or two things I would like to sort out but then this is still a work in progress. It will be very interesting to see how it settles in over the next few days and weeks, but we are starting from a high point I reckon.

So, in short this is a great preamp!!



Again, thanks to Salas, CRT, Teabag and of course papa himself.


Fran
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Old 26th November 2009, 01:17 AM   #534
Salas is offline Salas  Greece
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Cheers. Up your 220k across audio input to 560k if you are to use the 50k pot enough more. More resolution to come in a couple of days.
If your trafos won't get enough primary voltage any time soon, get a 2X15 100VA because at 200-250mA the current ones gonna duck more for secondary voltage. Constant current is demanding on the cores. Maybe go 8R2 2W directly for R1. 250mA is even better. There is a gm curve benefit for 9240's/240's around there. Mount the power resistor upright.
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Old 26th November 2009, 01:28 AM   #535
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Thanks Salas,


in fact I might just do that soon, as that would be a more fair comparison then to the lightspeed. As it is, the stepped pot has to be underperforming. No changes though for another few days I think, let it settle a bit more. In case I wasn't clear in my post above, I am impressed!


Speaking of lightspeed, heres my one ready to go in:
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File Type: jpg lightspeedl.jpg (167.2 KB, 684 views)
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Old 26th November 2009, 01:32 AM   #536
Salas is offline Salas  Greece
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With 250mA per side and 219VAC on primary, you won't avoid the 2X15V 100VA in the end I am afraid. With every step you take, (nice Police song BTW) ask here if having any questions.
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Old 26th November 2009, 01:42 AM   #537
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Yeah, I know, I know. Jus tmy luck though to have 12V, 18V and 24V tranformers! I might just try it with the 18V though. Thats a bit down the line though. Might get a 15V in the meantime.

225VAC here tonight though, and normally its over 230. Anyway, we will wait and see...

Fran
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Old 26th November 2009, 02:11 AM   #538
Salas is offline Salas  Greece
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RC filtering is your voltage drop friend.
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Old 27th November 2009, 04:05 AM   #539
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Do you guys think an IEC inlet EMI filter is a worth while addition the the dcb1? or just a waste of $$ ?

Here's a couple I was looking at ;
Schaffner EMC - IEC Inlet filters
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Old 27th November 2009, 04:51 AM   #540
Salas is offline Salas  Greece
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Never used one with the DCB1, don't know what it can do for it. If you use one let us know of any possible pros or cons you will find against a straight IEC connector's mains feed please.
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