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Old 1st March 2013, 03:49 PM   #91
PMA is offline PMA  Europe
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Michael, you may use anything with 5mm pin distance, even 5.08mm pin distance. Screw terminals will work well. WAGO can be replaced.
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Old 1st March 2013, 04:02 PM   #92
mlloyd1 is offline mlloyd1  United States
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pma:

yes, i realize that. you chose well; i like yours; both their action and the build materials.

i'll likely end up using the 5.08mm parts i got from digikey many years ago assuming i can still find them in my parts bin.

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Old 1st March 2013, 05:07 PM   #93
dodo is offline dodo  Poland
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PMA in his bil of materials suggest 100nF X7R small ceramic caps (not only in this phono pre)
you use poliester mkt caps
don't you worry such replacement could cause some rezonances?
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Old 1st March 2013, 07:43 PM   #94
PMA is offline PMA  Europe
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No, I have verified both.
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Old 3rd March 2013, 07:24 AM   #95
mlloyd1 is offline mlloyd1  United States
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Default still at it ...

more porn for you junkies ....

i will probably hard-wire input, output and power leads for testing. i have a stock of AD711s i bought back in the 1980s; they are my default servo op amp until the stock runs out.
my servo caps are not the small box types, i had some old 2.6uF axial polyprop films, so I just hide them on the back of the PCB. I'll glue them down later ...

i was going to use one of my jung super regs for testing, but I didn't feel like disconnecting the ones currently powering my line stage and i didn't feel like building up another set. so, i'll just use one of my old (built back in 1985) borbely designed sulzer-like regs that I keep around for times like this.

yeah, I use lots of old parts. for example, you'll see date codes on the AD711 from 1987 and my OPA627 parts say Burr-Brown (not TI) because that's where they came from way back when. But then again, I never have to worry about problems from counterfeit parts using this approach.


Unfortunately, I have no nice housings, though. So I will have to figure out some sort of enclosure for this preamp. The power supply will be remote; I hate hum.

So, is anybody else building this thing? I MIGHT get to listen tomorrow.
Time for bed now.

Good night ,
mlloyd1

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Old 4th March 2013, 04:11 AM   #96
nezbleu is offline nezbleu  Canada
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Quote:
Originally Posted by mlloyd1 View Post
So, is anybody else building this thing? I MIGHT get to listen tomorrow.
Soon... I have the board, but haven't yet ordered all the parts. It might be another month before I start soldering, as I have had some house repairs and an old Thorens TD 160 eating my budget. I will be using a Salas shunt regulator, and those boards are on order. I was thinking I would mount transformer, rectifiers, main filter caps, and maybe resistors (for a CRC filter) in one housing, and the regulator board and phono board in another.

Interesting that you used polystyrenes for C2/102, any particular reason or just had them lying around? Newark have some 1% tolerance 10nF axial polystyrene caps I am considering for the RIAA capacitors, or some Vishay 1% polypropylene box caps. OTOH 5% tolerance seems to provide good enough results, and the Wima's have a good reputation. Any thoughts? They also have some nice little 100pF polystyrene box caps which could work for C2/102. Decisions, decisions...
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Old 4th March 2013, 05:00 AM   #97
mlloyd1 is offline mlloyd1  United States
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I didn't buy any parts for this project; just used what's already in my parts stock. I used polystyrenes because I had them in the values I wanted. For frequency shaping applications, my preference is to use film-foil instead of metalized parts.
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Old 5th March 2013, 12:51 PM   #98
atupi is offline atupi  Romania
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So far i've seen measures very good but how it sounds this preamp ?
Comparision with some other omparable complexity DIY projects would be useful.
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Old 5th March 2013, 01:49 PM   #99
mlloyd1 is offline mlloyd1  United States
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i am sure some of us that build will make eventually make comments.
as for comparisons to other preamps, i'll leave that to someone else; i'm not a reviewer.
also, you may be able to find listening impressions at some of the czech diy audio sites; i know there is at least one site that has talked about this preamp.

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Old 14th April 2013, 02:11 AM   #100
nezbleu is offline nezbleu  Canada
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Default Almost there...

I finished this board recently, now working on the power supply. It will be a while yet before I can listen. I also just acquired a low-output MC cartridge, so will eventually have to make some decisions.

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