Finally I ordered Shinkoh for RIAA 50k 1w & 6k8 0.5w. Also ordered 820R 0.5w Shinkoh for first stage & 12k 2w Armtrans. When changed the RIAA caps also changed the 320R upper tube 2nd stage for Shinkoh 0.5w that I discovered in my stash.
Attached pics FSP build with teflon caps that are the same used in the Itch.
Attachments
![WP_20160711_001[1].jpg](/community/data/attachments/510/510291-a6ea269266cc5b5b4a702597ef670fcf.jpg?hash=puomkmbMW1)
![WP_20160711_002[2].jpg](/community/data/attachments/510/510307-ae10a90bcd49cacb418c2451d80abed4.jpg?hash=rhCpC81Jys)
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Salas I use 47nF teflon film & foil cap as interstage, if I change to 100nF teflon film & foil I will improve the SQ?
The interstage coupling cap C4 100 nF is set for optimal frequency response at 20 Hz (19,4 to be precise) together with R8 820K. Minus 3 dB response it then at 1,94 Hz. Your 47 nF has optimal bass response down to 41,3 Hz with the 820K, minus 3 dB is at 4,13 Hz. I doubt you will hear any difference tho, and maybe its only doing good for rumble.
Thank you so much..... would you share your american teflon cap supplier ?
Hi,
If you want your frequency response to be close to what it is with a 100nF coupling then put two 47nF Teflon caps in parallel.
Cheers, 😉
If you want your frequency response to be close to what it is with a 100nF coupling then put two 47nF Teflon caps in parallel.
Cheers, 😉
Shared in the Simplistic NJFET RIAA thread http://www.diyaudio.com/forums/analogue-source/129126-simplistic-njfet-riaa-601.html#post2520618
Is the 2C22 (7193) really all that different from 6SN7GT or 6J5GT? They're supposed to be electrically equivalent, I think.