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Old 22nd November 2012, 06:50 PM   #281
pdul is offline pdul  Denmark
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My Fairchilds were hopeless too, in the same way, and i bought it from RS.
Then i bought one more batch Diotec brand from Conrad in Germany, and it was much better matched.
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Old 22nd November 2012, 09:07 PM   #282
FdW is offline FdW  Netherlands
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In the Mpp thread I have posted this Mpp about grounding and connecting the player to the preamp.
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Old 22nd November 2012, 09:26 PM   #283
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Great work, Frans and Ricardo. I have not reviewed it in detail. Simply no time.
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Old 23rd November 2012, 08:11 AM   #284
hesener is offline hesener  Germany
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As announced in the group buy thread: All parcels are out the door. So I would like to ask all builders to share their insights, experience and of course listening impression !!!

With 300 essentially identical phono stages to be built around the world, this could be a great source of insight into many things, like cartridge - preamp interaction, component choice, arrangement in the case, etc etc - Looking forward to all the sharing! And of course, in case of issues or problems just post here and I am sure the team will be happy to support.

However, we all want this thing to work at first turn-on, so please read the assembly guide carefully , there is a lot of experience from the beta builders already there.

Please note: There are various references floating around, to R2 and R3 - both are the same except the input offset trimming which is implemented in the R3, so no worries.

Happy building!
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File Type: pdf Paradise R3 assembly guide.pdf (523.4 KB, 214 views)
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Old 23rd November 2012, 08:16 AM   #285
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Thanks Alfred.
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Old 23rd November 2012, 08:52 AM   #286
FdW is offline FdW  Netherlands
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Great job Alfred!
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Old 24th November 2012, 11:03 AM   #287
Nick77 is offline Nick77  United States
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Quote:
Originally Posted by pdul View Post
My Fairchilds were hopeless too, in the same way, and i bought it from RS.
Then i bought one more batch Diotec brand from Conrad in Germany, and it was much better matched.
Where are the matched transistors located? Are they just the 8 spots in brackets flanked by the 6800 caps?
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Old 24th November 2012, 11:19 AM   #288
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Quote:
Originally Posted by Nick77 View Post
Where are the matched transistors located? Are they just the 8 spots in brackets flanked by the 6800 caps?
Just look at build guide
Circle around imputs and current mirrors yes?
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Old 24th November 2012, 11:22 AM   #289
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On matching
I tried litle (big) Atals unit and mesure low
Tried curve tracer (but don't trust it) and Example get 563
Tried circuit published on build guide and mesure example 555

Litle circuit there is prety good.....
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Old 24th November 2012, 11:27 AM   #290
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Quote:
Originally Posted by Nick77 View Post
Where are the matched transistors located? Are they just the 8 spots in brackets flanked by the 6800 caps?
The answer to your question is on the first page of the assembly guide. The most important match is the 8 transistors at the input gain stage (these should also have the highest HFE). It's also important to match the transistors in each current mirror. But not necessarilly one mirror to the other, although I'm sure that won't hurt.

Mark
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