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Who knows these two tube preamp boards ?
Who knows these two tube preamp boards ?
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Old 14th January 2020, 01:05 PM   #1
as_audio is offline as_audio
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Default Who knows these two tube preamp boards ?

Starting to clean up my mess I found two circuit boards of what seems to be tube preamps.
May be kits of some DIY project.

First one:

- 150 x 285 mm, red board of good quality
- two tubes 5814A similar to 12AU7, ECC82
- heavy regulation with semiconductors LM1086, IRF840 2x
- big Solen and Clarity caps

There is no indication of brand or manufacture.

Second one in post 2.

Thank you for help.
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Old 14th January 2020, 01:07 PM   #2
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Default Or this one ?

Now the second one:

- 136 x 151 mm board size, blue, gold plating
- two tubes 6922/ECC88
- balanced inputs, unbalanced outputs
- passive supply
- not sure two IRF9610 Mosfets are for plate supply

Some members of this forum will know more, thanks again.
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Old 14th January 2020, 01:11 PM   #3
Tesla88 is offline Tesla88  Italy
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I was lucky with the first one here :

Hi-End DAC tube output stage
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Old 14th January 2020, 01:14 PM   #4
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This applies to post 1 - how did you know ?
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Old 14th January 2020, 01:26 PM   #5
Tesla88 is offline Tesla88  Italy
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I just entered " LM1086 IRF840 ECC82 " in the search field in Google images
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Old 14th January 2020, 01:37 PM   #6
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Well, I did this also ! No result.
Google will tell different people different results.
However, I am amazed, thumbs up.
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Old 14th January 2020, 01:49 PM   #7
Tesla88 is offline Tesla88  Italy
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I found the second one on ebay - no schematic but you might ask to the seller

BAL/unbal Input TUBE Vorverstarker Stereo PCB! | eBay
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Old 14th January 2020, 01:53 PM   #8
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Excellent.
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Old 14th January 2020, 03:31 PM   #9
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Tesla88, see the second board has Tesla tubes ECC88 ?
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Old 14th January 2020, 05:30 PM   #10
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Bal/unbal input tube preamplifier stereo PCB Ebay 220844600656
Perhaps some member can help out with the schematic for the item in post 2 , thanks.
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