|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
173.172.216.69
I recently acquired a stock Citation 18 tuner in decent condition. I already have a heavily modified Citation 18 tuner in my main system that I love so much that I bought another one to put in my second system. My modified tuner was done by RadioX, Bill Ammons, and Joseph Chow. Each did their own unique tweaks but the end result is a fabulous sounding tuner. The one tweak done by Joseph Chow is on the power supply, he put in Fred diodes in locations Cr1 and CR2. He put four in each location and soldered off the ceramic caps.The diode values are specified in the manual as Bridge, 1 amp, 100V.
Which leads to my question. I want to modify my stock Citation 18. I have already reviewed posts here on this forum on which key caps to replace on the different boards. I just ordered a lot of Elna Silmic II caps with equal or higher voltages, so I'm good with the caps, but which current diodes would sound best in the power supply? I want the power supply to be quiet, yet powerful with excellent dynamics and natural, life-like sound. Thanks for your recommendations.
Follow Ups:
One central lesson for me is how vital a big quiet PSU is - even for line-level sources.
It's not just quiet diodes, it's high uf capacitors, bypassed.
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
Timbo,
I agree that a beefy power supply is critical to achieving good sound with proper dynamic contrasts. I have bumped up the three main caps in the tuner from 2200uf to 3300uf. I had to drill new holes in the board trace to make these fit. Going any larger would take some serious shoe-horning. The sound is much better with the better caps with increased size.
bypass at least the last one if there's room.
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
Thanks, Timbo. Here is a photo of a Citation 18 tuner from the FM Tuner site. The boards are all sideways plug in. The power supply board is on the left.
If you unplug that board, looks like there is enough room to get a .1 or .22uf film cap on the trace side of the power supp PCB brd. That would be worth your effort if you can accomplish that.
...There is a 1" gap between the boards so plenty of room for small bypass caps. I'm wondering which cap would benefit the most from a bypass. Page 16: power supply pc board.
YOu could add a .1uf or a .22uf to each filter cap.
Hi sherod,
I used 11DQ10 Schottky diodes in mine 1.1A 100V available from Mouser or Digikey. Might I suggest you check/replace the caps in the de-emph circuit with some matched poly propylene or styrene caps
The 18s are great units, enjoy
HA
I will take the polyprops into consideration.
Post a Followup:
FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: