Salas hotrodded blue DCB1 build - Page 277 - diyAudio
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Old 28th February 2013, 01:54 AM   #2761
mantha3 is offline mantha3  United States
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Join Date: Oct 2010
I'm going to run a diyGENE.com R-Core 100VA

100W R-Core Transformer 115V//230V ,Pre amplifier / DAC
- Model: R80-53
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Old 28th February 2013, 01:57 AM   #2762
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Location: Toronto
Quote:
Originally Posted by mantha3 View Post
I'm going to run a diyGENE.com R-Core 100VA

100W R-Core Transformer 115V//230V ,Pre amplifier / DAC
- Model: R80-53
That is the one I will use as well (as soon as I sell some stuff to build up Paypal balance).
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Old 28th February 2013, 03:56 AM   #2763
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The diyGENE.com R-Core is basically half the price of the SumR toriod.. That would be nice to pay half if the R-Core unit is equal or superior to the SumR toroid. I need to do some research and learn which unit would be best for this application. I have already put so much $$ into my build, i don't want to cut any corners at this point.
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Old 28th February 2013, 07:33 AM   #2764
stajo is offline stajo  Sweden
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Location: Stockholm
Default Tweaks

Although there must be a lot of subjectivity in tweaks of an alredy almost perfect product atleast I would appreciate to know what changes to the original components and settings that people appreciate, hear differences in etc and how the tweaks is or seems to affect the original.

I guess it will most have to do with signal resistors, bypass caps and current settings.

Any artistic descriptions is welcome

I had to jump to other stuff last weeks but my separate PSU version 0.1 is taking shape and the boards are stuffed with 8,2 and 10R settings resistors. Im also making a dummy chassie (some clamped plates and the sinks in general).

Best regards
Staffan
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Old 28th February 2013, 10:18 AM   #2765
AndrewT is offline AndrewT  Scotland
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Location: Scottish Borders
Quote:
Originally Posted by madisonroberts View Post
Hello,
I recently finished an F5 and was so amazed by its quality that I jumped right into building a DCB1. I am planning on "hotrodding" with 10R resistors to start. I have bought large enough heatsinks to withstand more heat (i think) if i decide to take it to the next level. Anyway, I built my F5 with top quality components and I am doing the same with this build. I am still waiting on a couple of parts in the mail. I haven't made up my mind on a chassis yet.. I am also trying to decide on a transformer. I got a quote on a SumR toroid (80VA, 2X15V). I believe I will buy one of these but am still searching for alternatives. Since the fire at Antek I have had to do some research on quality toroids. I have also found an R-Core that is a fraction of the price. Any suggestions on this decision would be nice.

My main question is about my heatsink configuration. Can i mount the heatsinks with the fins facing downward (toward the bottom plate of chassis). It seems (because heat rises) that this might not be beneficial. I posted a photo of what I am considering.

I splurged and bought a 10K Khozmo 48 step attenuator. I have never had a nice volume control in my signal path so i am excited to see what it can offer. I have been inspired by the Lightspeed (or "Lighter Note") LDR volume control and may build a stand-alone unit in the near future.

I am planning on running AC mains through a Schaffner EMI line filter (FN2070-3-06). I originally bought it for the F5 but decided against it.

I just got my 2SK170BL's in the mail (Thanks Spencer). I was very diligent when matching the LEDS. They were already very close but they are spot on now.

Any comments/suggestions would be nice. Especially about my heatsink configuration and any ideas on a transformer. If anyone has any experience with SumR and can relate their toroids to Antek, that would be great. Antek says they will have their full stock back in mid-April but I do not want to wait that long.

Anyway, thanks for the inspiration on both of these builds. I have only been "tinkering" for about a year but it has been an amazing hobby. I knew absolutely ZERO about anything to do with electrical work of any kind. I have a TON more to learn..

Thanks in advance,
Madison (Tennessee, USA)
Turn the whole assembly upside down, the transistors won't mind.

The PCB will now be under the sink and run cooler.
The sink fins will now be pointing upward and thus dissipate more heat for a lower Ts.
The components on the pcb will now be in the coolest air.
Three gains and no downsides.
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Old 28th February 2013, 12:23 PM   #2766
mantha3 is offline mantha3  United States
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diyGENE.com R-Core - The shipping to the US to MN for me was about 30 bucks... So keep the shipping in mind..

I've read this forum on and off for a while and I've read a couple posts on people using the diyGENE RCores and say good things. Some running the 50VA ones and others running the 100VA ones. I thoght RCores were the most recent technology and best... I'd guess a high end toroid VS this RCORE is not really a comprimise either way.

I'm going high end parts too... Texas Componenets, Caddock,

I thinking Mundorf Silver in Oil on the.47 caps on the board?
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Old 28th February 2013, 12:42 PM   #2767
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The BOM calls for .22uF caps, right? Is .47uF OK?

With the addition of the $30 shipping to the US from diyGENE.com, it puts it very close in price with the toroid. Price is no longer the determining factor. I will decide today and place an order either way..
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Old 28th February 2013, 01:50 PM   #2768
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Location: Toronto
Quote:
Originally Posted by mantha3 View Post
diyGENE.com R-Core - The shipping to the US to MN for me was about 30 bucks... So keep the shipping in mind..

I've read this forum on and off for a while and I've read a couple posts on people using the diyGENE RCores and say good things. Some running the 50VA ones and others running the 100VA ones. I thoght RCores were the most recent technology and best... I'd guess a high end toroid VS this RCORE is not really a comprimise either way.

I'm going high end parts too... Texas Componenets, Caddock,

I thinking Mundorf Silver in Oil on the.47 caps on the board?
In post 2260 AndrewT provides very useful info on transformer selection. At 600mA you need a 36VA transformer minimum. 50VA will run cooler, but Andrew recommends double the required VA or 72VA. Since these are hard to find, I will go 100VA to keep temps as low as possible.

My research said that a very good toroid is as good as an rCore.
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Old 28th February 2013, 01:57 PM   #2769
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U
Quote:
Originally Posted by madisonroberts View Post
With the addition of the $30 shipping to the US from diyGENE.com, it puts it very close in price with the toroid. Price is no longer the determining factor. I will decide today and place an order either way..
Shipping is a big part of the cost (they are heavy after all).

This the quote I got on the sumR:

The transformer 100VA ,
a/ with an electrostatic screen and core band is Cdn $ 74/e
b/ Above shielded and totally encapsulated into toroid container is Cdn $ 85/e

Shipping extra. CDN$ are at par with US$ for some time now.

For the 100VA, Antek is $18, $21.60 shielded. Shipping is only $12 in the US, but Canada/Mexico is $43 and International is $63.

DIY Gene is $46 + $38 shipping from Hong Kong.
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Last edited by mike_mcf; 28th February 2013 at 02:09 PM. Reason: update on Antek.
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Old 28th February 2013, 03:17 PM   #2770
mantha3 is offline mantha3  United States
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DIY Gene is $46 + $38 shipping from Hong Kong is the exact same charge I got shipping to MN, USA for the 100VA Model: R80-53 which I think is the right one to get.

I think the .22uF is correct. Iíll go with that. I am just building a pure buffer. No attenuator.. Just one input pair of RCAs direct to the DCB1 and then direct out to the output RCAs.
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