Keeley - Katana

mictester · Post by **mictester** » 02 Oct 2013, 05:35

maindog wrote:Hello everybody, tread resurrection!!!

Where did you guys get the 1nf cap? Is this the tantalum cap or I'm wrong? If it is the tantalum cap the smallest I have found is 4.7 nf. Or everybody is using other type like silver mica or ceramic? Thanks for your answers!!!

Ceramic, silvered mica, polystyrene - choose whatever fits - the type doesn't matter, only the value does!

andregarcia57 · Post by **andregarcia57** » 17 Nov 2013, 15:33

C4 is correct in what transitor? Q1 or Q2?

zulas · Post by **zulas** » 08 Oct 2015, 07:46

Hi,
just built the keelay katana boost by this vero layout :
http://tagboardeffects.blogspot.lt/2014 ... rev-2.html
I managed to bias the transistor to 9 volts using 250k trimmers, but what i get in clean boost mode, the sound is very darka, muddy. The overdrive boost mode seems to work fine? Could you help me identify where could be the problem and how to solve it?

sopapo1 · Post by **sopapo1** » 02 Dec 2018, 16:42

I have built this too http://tagboardeffects.blogspot.com/201 ... rev-2.html
And is working but...the dc bias v on the first stage jfet is shiftin down..at first is in the 8,5 v required(aprox) but in the next minutes its beging to shift until 4,5V...why??
I use two 5458 and I am getting good vcc voltage out of the 7660s (16,5). In the second stage dont have this issue and I have used another 5458 and with the same results...
any idea its welcomed, thanks in advance!!!

dromilious · Post by **dromilious** » 14 Jul 2019, 11:48

This circuit is a pain in the head. I bought 30 pieces 7660 and all make the known oscillating noise.I also bought 10 pieces of max1044 and the same problem. Some months ago i had bought some 7660's which where noisless .Any ideas please ?

Nocentelli · Post by **Nocentelli** » 14 Jul 2019, 16:48

dromilious wrote:This circuit is a pain in the head. I bought 30 pieces 7660 and all make the known oscillating noise.I also bought 10 pieces of max1044 and the same problem. Some months ago i had bought some 7660's which where noisless .Any ideas please ?

7660S - The "S" suffix denotes that connecting pin 1+8 will boost the frequency of the switching above audio band.

dromilious · Post by **dromilious** » 15 Jul 2019, 07:15

yes i have the 7660S CPAZ .also the max1044 are CPA.bought from ebay. hmmm fake ones ?

plush · Post by **plush** » 15 Jul 2019, 08:23

dromilious wrote: hmmm fake ones ?

Different model, I'd say.

dromilious · Post by **dromilious** » 17 Jul 2019, 07:58

Also many of my mpf102 make a noise like an old vinyl.