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Low noise Balanced MC Pre
Low noise Balanced MC Pre
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Old 1st December 2021, 02:59 PM   #261
Bonsai is offline Bonsai  Europe
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Low noise Balanced MC Pre
Thatís great to know Jack. Iím about to order a few more - hopefully Iíll get the same results.
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Old 1st December 2021, 03:40 PM   #262
syn08 is offline syn08  Canada
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Quote:
Originally Posted by Hans Polak View Post
In the TranBal Hfe and Vbe are IMO not very relevant
True but otherwise Hfe is very important in bipolar low noise circuits, it defines the input current noise. Hfe was the beauty of the now extinct low noise bipolars like 2SC2547/2SA1085; they combined low Rbb (under 2 ohm) with very high Hfe (1000 was very common). At 15mA, this leads to 0.7pA/rtHz, while with the ZTX devices one cannot hope for anything lower than 2.5pA/rtHz. Not important for a few ohms of source impedance, but for a high level MC cartridge this could be very important in the noise budget.
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Old 1st December 2021, 04:50 PM   #263
Bonsai is offline Bonsai  Europe
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Low noise Balanced MC Pre
Here is the PCB so far - still some more refining to do but nearly there. board is 160mm x 110mm.


Remote +-15V PSU is also finished. After that the rear panel will be done for those that want to use a Modushop housing (through the rear panel away and use the PCB rear panel - same as X-Altra).
Attached Images
File Type: jpg PCB_In Progress.JPG (326.7 KB, 71 views)
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Old 1st December 2021, 09:06 PM   #264
Bonsai is offline Bonsai  Europe
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Low noise Balanced MC Pre
Remote PSU. This slides into a small Modushop housing and the rear panel is also a PCB
Attached Images
File Type: jpg Remote PSU.JPG (143.7 KB, 61 views)
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Old 1st December 2021, 09:43 PM   #265
Bonsai is offline Bonsai  Europe
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Low noise Balanced MC Pre
Project on hold until next Tuesday as I am away.
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