Hello,
Thank you Enzo. The space for the 2SD313 is configured for that transistor. the other two spaces have the flat sided circle are the 101 and 103 that would use the 2SC1815.

Hello,
Thanks g1. I have one more question. Q7 and Q8 are marked D313-E7F3. Next to that are the the 3 holes on the PCB for another transistor, marked 102. In addition there is a hole drilled in the heat sink to mount it. so could 102 also be a D313-E7F3 ? All 3 are in line.

Hello,
OK Enzo, that all seems very reasonable. Another thing that has perplexed me is C-102 that simply states 100 with no decimal point and C-107 that just has 22. The rest looks all right. I made a list for the capacitors and resistors, and now the transistors.
I will now just have to research which reverb tank to use. I don't want to use one that is either not large enough or to to big.
It also seems that the Fender and the Squier circuit are almost identical other than the reverb.
Thank you for the thought and effort you put into explaining the transistors

Hello,
Thank you g1, that was very informative. I will have to look into the transistors. I printed out the last page. I was so glad to get that much information at one time.

Hello,
While looking on the internet today, I found that in 1986 Fender marketed a Squier 15 reverb amp for sale in Japan. That may be why my amp has the reverb circuit traced onto the PCB board.
If I can get Fender to send the schematic for that I think the problem will be solved.

Hello,
It has in and out for a reverb tank, not into and out of the existing circuit. Without a schematic showing where to tap into and out of the circuit I am still at a loss, as well as what parts are needed.
I already know it's just a cheap amp to you but, I would like to upgrade it as I have had it since 1987. It has been very useful and dependable.
The few upgrades like the 12" speaker and staggering the clipping diodes made a remarkable difference. Now I think adding a reverb tank would only enhance all of that.
I am sorry to have created such a problem for you, I only ask on this forum because I thought it would solve the problem for me, was I wrong ?

Hello g1,
The amp is made in Taiwan. The two pieces mounted on the heat sink are D313-E7F3. Each piece has those two numbers on them. They are part of the output.
I cannot take a picture of the face plate right now as it is disassembled.

Hello,
It only has the number of the resistors as per R102 -R102 ect. No values on any of them . I have just sent a letter off to Fender maybe they can enlighten me as to the value of the missing parts.
You are also correct about everything is there, in out ect. just the values missing.

Hello,
That being the case and, the circuit will support a reverb. Where could I plug it into the the existing circuit ?
If I obtain the reverb tank from the Fender Frontman 15R and use that circuit how hard would it be ?

Hello,
Here are the photos. As you can see it has spaces for reverb on PCB.

Hello,
If I build this reverb circuit from the 15r,and, order the appropriate reverb tank. Where would I insert it into the Squier 15 circuit?
I know everyone thinks this is a waste of time but the reason I really like this amp is because of the controls. It has treble, middle, and bass. Most amps get ice picky or muddy. I also like the fact that with very few mods, it has become quiet playable, moderately loud, without sounding junky.

Hello,
Thank you g1, I have bookmarked that exact article. I am not competent enough to know where to put it in the Squier 15.
I can salvage a tank out of a crate amp that I have. I am just at a loss as to how to control the intensity and volume.

Hello,
After many mods, I would like to put a reverb tank into a Squier 15. I have installed a 12" speaker, offset the clipping diodes, and reduced the size of one of the resistors in the front end of the amp.
So far it has worked out well. I would like to take it further and add a reverb tank as I think it would more depth and texture to the sound. I would appreciate any suggestions, and or input regarding this project.
I already know this is a cheap amp, not worthy of any serious time or effort however, the modifications so far have led to amazing results.
Thank you for any replies or suggestions you may have.

Hello,
      Search this forum for photos of the inside. Or bridge grounding problems.I am not sure what is wrong with the guitar or amp. I just noticed the guitar stops buzzing a bit when you touch the strings. That sometimes means the bridge isn't grounded.

Quote from: Freddie on February 11, 2010, 06:37:11 PM
Trying to get a better drive sound from the 25R. Looking at the schematic of the 15R and the 25r the difference in the two circuits seems to only be the switching and two diodes. What would be the purpose of D1 and D2 in the 25R drive circuit?

Hello,
   I would like to say, I have two solid state amps (Squier 15, and a really cheap RMS 200 amp) by using the advice given to me from these same guys, the difference is remarkable.
   The most effective modifications were using a 12" speaker, offsetting the clipping diodes, removing the back from the amplifier cabinet, no other changes. Offsetting the clipping diodes was the only thing that required soldering. It required two diodes I had pulled from things I had already disassembled.
    The only reason you still have questions is because you haven't done it yet.