nevermind man its ok...ill just hold on
hope you do fine in your test, go get em ,,,lol

waiting eagerly

thanks a lot for the information and the offer, i dont know how to thank you ...

taking pictures is just GREAT  :tu:
the values i want to know are :
C12
C24
C2
R4
R10
R13
AND THE TRANSFORMER OUTPUT VOLTAGE

thats all for now,,lol
im realy gratefuLLLL

no problem ,the most important values to check is C12,C24.
C2 AND R4 also if you can locate em.
and how much voltage does the transformer outputs

by the way,,is it that higher freq signals are louder than others? do u notice somthin like that? or maybe distorted?

ill be very thankfull man,
,i would realy apreciate it if you can get the right schematic
thanks already

well
1/ if you want to allow some distortion at high volume levels then u surely cant get rid of the output cap C24 as long as there gonna be some dc component in the distorted output signal (use forrier transforms),and actually it doesnt kill the beauty of the response so i would surely include it, you mentioned that it should be unique somehow, what kind of caps is good to implement as an output cap?

2/ill build the amp with only c12 modified then ill see if it needs another values to be changed.
well i wanna as joecool if any chance he comes here,is the amp introducing distortion at high level clean channel ?specially at high freqs?

3/here i did plot the quarter volume with half bass/treble/midrange boost (output cap is included,c12 is 10uF),above this we start to distort freqs. anyways it looks cool.
the only thing i hate about this response is the low frequencies phase shifts,,its big under 100 hz, hope it doesnt affect much.

maybe after i build this ill start change some values to get my tone

so you think my mods should worth building?
or its better to go back to the original circuit?

im really confused. :duh

here is the all values modified plot ,,i made sure no voltage in the whole circuit goes over 15 volts..still dunno how spice plot such voltages....
the green is the node before the output cap reference to ground
the blue is the voltage across the 4ohm resistor

the WHOLE amp with only c12 = 10uF

thats the response of the amp without any mods at all

well i did simulate the power stage and i got the same results ,
and yea that c12 was one of the stuff i did modify,here are the values i changed

C2=15P      >>>   100P
C3=33000P >>>   0.5u
R5=100K    >>>   200K
VR1=1M     >>>   330K +500K(POT)
C8=2200P   >>>   2000P
R10=3.3K   >>>   2.2K
VR4=10K    >>>   5K
R15=470    >>>   800

i plotted the whole amp with only changin c12 from 1u to 10u
,,well, surely still there huge gain,so i did change the other values and i got that other plot in blue ,,the green plot is the voltage(before the output cap) reference to ground.
if my supply voltage is 15 i dont know how on earth the spice gives me voltages bigger than that ,,,!!!!!! so i did the whole modding to ensure that there is no voltage in the circuit is more than the supply voltage at maximum gains.thats why i did plot the voltage before the output cap(cuz its the biggest voltage in the circuit).
i guess i kept the characteristics of the tone and the amp in general .
also if you calculate the cutoffs at the first and second stage after the modding you see that they are (16hz) and (33000hz)
which i think is way better than (47hz) and (200000hz) days before.
im still afraide about boosting the bass that much that speakers blow,, is that possible,, maybe they did attenuate freqs below 50hz intentionally...
still dont get it why they designed an amp with such freq respons,,

anyways, where do u get speakers spice models from?
i would like to try that on the modified amp.
C11=15P    >>>   100P
C12=1u      >>>   10u

i tried to upload the spice file but i couldnt,, its not allowed
ill upload it as a picture but its not clear at all...
well anyone feel free to ask if any value is not clear

well i did check my circuit ,it has some caps values errors but it didnt change that plot much,,
its actually the tone control is cutting much of the midrange and bass gain (fender type)
and when this curve is getting amplified the treble area is goin way higher than the mid and bass.
i did change some values of the circuit. some caps and resistors untill i got this plot,,,look how HOT it is.
i killed that very high gain in the high freqs area and i gave some more gain to the bass area. keepin the midrange weak to maintain the properties of the fender tonecontrol.
the input here is 0.02v and again the circuit is workin with its highest gain with maximum bass/treble/mid boosting
,,i feel like the amp is very sensitive,,right? i mean when the input gets higher than 0.02 v there gonna start distortion...what do u think on this?
also im plotting it in the linear axe cuz i wanna know where exactly its gonna exceed 15 volts,,so i can modify to get rid of the distortion.

I Did draw the whole amp (with biggest gain and biggest boost for bass/treble/midrange) by spice (clean channel)
and i put input of 0.02 volts for (ac analysis)
(+15 -15)op amps feeding
and i got this curve,,, bUT ::::
it looks like there is not enough power in the bass and midrange  and too much distorion at high frequencies (over 6khz) (output more than 15v)...
this is a clean channel so there should be no distortion and if we preserve that the gain at midrange and bass would be very little wich leads to low power...... that looks weird,,any body can explain?

yea true im sorry i was mistaken between the 2 diodes configuration and the 4 diodes one,,thanks for noticing