It will work fine without the Yarra (but kind of messy), and you will need a clean dual rail PSU. 18v should be ok for a HPA - you will need to adjust the resistors on the CCS to get the current up to, say 80mA to 100mA for driving lower impedance phones. I used mine with only 42mA bias and they worked surprisningly well on 55ohm headphones.
Maybe just get a set of Melbournes to play with? They are TH.
Yep that sounds good - which resistors would need changing?
I'll send you a PM about board order instead of clogging up this thread
Hello builders,
here link for eDrawing file download (viewer tool is free):
YARRA PREAMPLIFIER_GX383.EASM - Google Drive
JP
here link for eDrawing file download (viewer tool is free):
YARRA PREAMPLIFIER_GX383.EASM - Google Drive
JP
The Yarra boards arrived yesterday. They look great and this has got to be the heaviest shipment I have ever received in PCBs. This stack of 30 boards weighs 15lbs - a truly magnificent bruiser of a PCB. Superb layout by JPS64 as usual. I also ordered some extra input panel PCBs with a modified pin geometry for the rotary switch. I will include those at no cost and they will give you a spare input panel with holes for both a Lorlin and a C&K rotary switch.
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