Pete B
-
Posts
2,325 -
Joined
-
Last visited
4 Followers
Recent Profile Visitors
Pete B's Achievements
Single Status Update
-
Hi Pete,
I just did a recap of Dynaco a25's which included your 1uF mod. Luckily I have two pairs so could A/B with the an original crossover. As expected there is a very nice increase in the top end and the addition of "air" as you say. The original cap was 4.7uF. It measured 5.2uF when removed. I replaced it with parallel 3.3uF and 1.8 uF Jantzen Standard-Z caps.
Would you have a moment to quickly explain the effect of the 1uF cap? My electronics is getting better but I'd like to hear your thoughts.
Thanks very much!
-
The tweeter level control provides some resistive attenuation. Remember/consider that a cap passes
high frequencies and the addition of the cap provides a path for the highest frequencies to in a sense
bypass the resistive loss. It can only lift the same amount that the resistors are attenuating so as you
turn up the level the effect will be less. You can bring the HF bypass to pass at a lower frequency by
increasing the size of the cap.
-
Thanks so much for your reply Pete. I'm only seeing this now after a recent post I made concerning AR-5's. Yes, I've been reading about the bypass cap and this was a very obvious sonic change...not to mention the new 5uF film cap I also installed. I did read that some suggested the 1uF should have been .1uF and the "." was possibly omitted in the document. Perhaps you could confirm.
Thanks again.
-
I don't know where anyone made that comment but they are wrong it is 1.0 uF.
-
