Cornet C8 Mod: Disaster

Doc Jr 8156 · « **on:** 18 Dec 2003, 06:45 am »

Hello,

After reading some upgrades thread for the Cornet, I replaced the C8 with 1uf Auricaps and C7 with Orange Drops of the same stock value. The result: everything change for the worse. My Cornet loss gain. I usually use 1/4 volume adjustment for a reasonable listening level from my preamp but now even at 1/2 the gain is still low. I even integrate my Lundahl step-up inside the Cornet and still the gain was so low considering I should be running the FF: Cornet gain = 44db + Lundahl gain of 14db + preamp gain of 18db, at least 60db. How did this happen? I tried locating the thread when someone adviced Auricap 1uf 200v for C8 but to no avail. By the way, the original C8 value is I think .01uf. Can anyone help? Thanks.

hagtech · « **Reply #1 on:** 18 Dec 2003, 07:47 am »

C8 is 1nF, or 0.001uF. Are you sure you have correct value? The 1uF auricap recommendation is for C6.

jh

Doc Jr 8156 · « **Reply #2 on:** 18 Dec 2003, 04:05 pm »

My bad!

Thanks Jim. I definitely misread the parts, again. Yes, I did install 1uf Hovlands in C6 . I ordered the correct values (Orange Drops) and I will totally replaced all capacitors with botique parts in their recommended values this weekend. I'll be using Orange Drops, Holcos and Auricaps. One last thing, with a 1uf caps at C8, what will the result be in technical terms. Again, thanks much.

GRD · « **Reply #3 on:** 19 Dec 2003, 02:05 am »

Audioasylum has a thread on RIAA capacitors that might be of interest. Thanks for the tip on the Riken resistors. Expensive but nice sounding.

http://db.audioasylum.com/scripts/t.pl?f=tweaks&m=55285

hagtech · « **Reply #4 on:** 19 Dec 2003, 03:49 am »

Changing C8 from 1nF to 1uF pushes the 75us time constant down a bit too far. From 2122Hz to 2Hz.

That would be your loss of gain. I suppose almost 40dB gain loss at 1kHz. It also makes the RIAA a double slope in the audio band.

jh