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In Reply to: RE: Hoosier, thanks for the pic... posted by HoosierAudio on June 23, 2016 at 21:46:56
I was wondering which caps and resistor are for the 75us? Also, did you hear an improvement with the Ammons adder board and filters? Bill emailed me with a quote and said there are two filters, the GAXX being the low one with least distortion.
75Ás uses all the caps:
The Left Channel is R4 & C9/10/11
The Right Channel is R5 & C12/13/14
Remember that there are consequences in changing out the filters. It will pretty much require an alignment after the change-out. There is one 3 pin and 1 4 pin filter in there. The 4 pin is equivalent to 2 3 pins. What Bill typically does is give you a matched set of 3 GDT filters, and with his adder board which has enough gain to compensate for the insertion loss of the GDTs. If I remember correctly the GAXX filters are GDT types.
I hope that makes sense.
The resistors were way off, reading 5.5K. I put in two KOA Speer 1W, 6.2K that read 6.12K. The improvement was huge. I then found I needed to add 330pf to get a final reading of 74.3 us. The highs are now greatly extended; bells, cymbals,etc. sound much more extended and dynamic. Thank you for this recommendation.
...I would have to ship the tuner somewhere to have someone professionally do this. I had it aligned a few years ago.
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