Wrong Caruso feedback amp frequency curve?

[rcvinyl]

Hi Trolls,
In the last few days I found that I have a lot of mid-to-high frequency distortion, but the westrex head sounds normal from the outside, so I checked the frequency response of the main power amplifier, it is very flat, but I checked the curve of the frequency response of caruso feedback amp. It seems that the curve from 300hz to 1500hz is problematic? Is this the cause of my distortion?

91271633607784_.pic.jpg

[leemichael]

Maybe ask Flo first.

[rcvinyl]

my westerx head's coils replace recently, the feedback amp also get fixed recently, so I am not sure where the problem come from, not sure about what is the correct curve about the feedback amp

[rcvinyl]

should it looks like a RIAA Curve?

[flozki]

you have to check closed loop with flokason dummy head!
open loop it does look quite weird.
i will update infos soon on
www.vinylike.com

all amps i build are checked and verified.
all support from ym side is on www.vinylike.com

i can not speak for 3th party builds, this is all in your own hands.

i hope you understand i can not give free suport and if you buy stuff from other people
who make quick money with my designs and it does not work as it should ask them.

happy cutting
f.