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Old 25th February 2013, 07:56 PM   #951
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Originally Posted by voxxonline View Post
What is the difference in BOM's SQ wise ?
In practice there are 3 BOMs:
  • an Absolute (Suggested best part), price no object one
  • a standard Full Industrial Mouser BOM (suggested)
  • a 'On a budget' BOM which lower cost at a price in term of performance
Unless money is a real concern I suggest the full industrial Mouser BOM.

Then listen to the amp, if it suits your taste/goals then you can upgrade it with audiophile parts.
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Old 25th February 2013, 10:28 PM   #952
Kreisky is offline Kreisky  Italy
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One of the veteran MyRef builders (madisonears) has done a lot of work with a bi-amp configuration. Maybe a PM to him might produce some good advice for your project.
Thank you Bob, if I go with bi-amp I will contact Madisonears

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Yes



Yes, but after a brief listening session you'll prbably want to biamp with FEs only...
That's the problem
I think that I will start with My-ref A + FE and then I will decide if upgrade with two FE. But I don't know if I will go on with this project... maybe I will simply use My-Ref FE.
Thank you Dario !
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Old 27th February 2013, 08:53 AM   #953
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Dario's mentioned r core from selectronics is good choice. But I ve been looking into toroidal power and some people say toroidy.pl is very good quality audio grade trannies (as per email: Audio grade transformers with mounting pads:
TS 225VA PRI: 230V SEC: 2x 24V - cost: 47,90 EUR/pc (tax. inc). In audio grade, noiseless transformer price You'll get transformer wound on high inductive, selected and measured core. Core and all the windings will be impregnated. Transformer will also has electric and electromagnetic shields, epoxy filled interior and mounting pads in price.)
Price almost equal.
What would be better then ? R core or top quality toroid ?
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Old 27th February 2013, 09:05 AM   #954
bcmbob is offline bcmbob  United States
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I have my doubts about the benefits of the extra shield. It's not a bad thing but I can not perceive any difference when it is, or is not connected in the three builds that have it. The shield might help in an integrated build where there are sensitive components in a compact space, but most likely isn't necessary for a straight power amp.
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Old 27th February 2013, 09:10 AM   #955
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Thank you Bob
They have a "standard" transformer which is 29 euro , you suggest using this instead ?
Or to go just for local uk based manufacturer ... if it makes no big difference
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Old 27th February 2013, 09:33 AM   #956
bcmbob is offline bcmbob  United States
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The only reason I haven't tried an R-Core is the cost of shipping for the larger transformers to the States. If you can get a good price on one of those in the UK, that style (according to Mr. Inserra) produces the cleanest power. I used the smaller R-cores in my DAC and preamp and there is an audible improvement.
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Old 27th February 2013, 09:35 AM   #957
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Roger That
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Old 27th February 2013, 09:36 AM   #958
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What would be better then ? R core or top quality toroid ?
I would guess R-Cores but can't say for sure...

BTW If you're going to buy a toroid prefer 2x25V secondaries, toroids has worse regulation than R-Cores.
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Old 27th February 2013, 09:42 AM   #959
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It is decided- r core from france (still strange enough having international delivery and website only in french )...
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Old 27th February 2013, 10:20 AM   #960
AndrewT is offline AndrewT  Scotland
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Originally Posted by ClaveFremen View Post
toroids has worse regulation than R-Cores.
I doubt this.
500VA to 600VA toroids generally have ~4% regulation.
1000VA toroids are usually below 3.5% regulation.
What is the regulation of a similar size R core?
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