5e3 problem - low output!

[vibratoking]

It looks way better now. The back of the tone pot looks like it has taken alot of heat. Be aware of that as you troubleshoot. Put her back and see what she does. You're gonna love that amp.

[tsutt]

See, wasn't to difficult it just has to flow. finish it up the same way i bet you have a whole new amp.

[ben85]

yeah,ti looks more an amp now.however,the funny thing is that now does not work at all!!!haha!the tubes are lit,i rated approximately the same values, except pin 1 at 12AX7B,where i have +100v (?).no sound at all,not even a buzz or some noise.i'll check my input and output jacks tomorrow.however,if anyone think that it may be something else,please tell me.thank you!

[tsutt]

I think you need to slow down and go over connection 1 x1 and double check your connecting to the proper location. And on fire first without tubes. and check voltages out of the pt at the proper location then the rectifier and do the same thing and you should probably using one of the light bulb limiters. I dont have the link to the site i think it one of aikens papers on first power ups some one here should chime in with it.

[ben85]

still the same thing guys!the tubes are lit,but they do not "turn blue" with a loud signal.they stay as blue as when the amp is on,but idle(as it is when i turn the stand by switch on... any ideas?

[Reeltarded]

How good would you be at metering everything? Not so much to get voltages at first, but if you start on an AC setting with the amp turned down and over at the output tubes just using the probe to find the latest place in the circuit that seems to be passing good signal?

Does that make any sense? For instance you get louder tick fritter and pop over at the output, then working back towards the input the probing noise drops dramatically.. it's a way of getting to know the amp without being exacting in the details. That is how I start troubleshooting similar problems.

[ben85]

i admit i didn't understand very much..i'm really really sorry,but my english are not good enough...can you make it simplier please?thank you very much,and sorry again!

[ben85]

comparing to another 5e3,i found out that at mine, the 12AX7B are not lit enough!!so, i guess this is at least a part of my problem.but,on what this depends?the filaments or something else?cos i have 6,53VAC at fils at all tube plates.

[cbass]

Your filaments Are probaly fine .If you are getting around 6.3vac att all the sockets.


Some of your first pics show your amp powered up with tubes in and no speaker connected DO NOT DO THAT EVER AGAIN.

Is this a weber kit?I would suggest Trying the Weber kitbuilding forum.

No offense but this forum is not the best place for beginners.

[rogb]

http://www.tdpri.com/forum/shock-brothers-diy-amps/

There is also a lot of support available at TDPRI - small Fenders are the main amps being discussed here

[ben85]

i've posted at other forums too,but in this forum i got some answers,in others not even a reply.also,many have faced the same problem as me,as i've searched enough before i post here,but nobody have the same source of the problem.i'm sorry if i ask silly questions,but my aim is to fix my amp and not to be a pro.so, if anyone wanna help me,i'll appreciate this.well,i think since it's a forum for advanced and not beginners,i think it would be easy enough for you to answer me,what's the reason of my poorly lit 12AX7Bs.anyone have an idea?

[NickC]

i've posted at other forums too,but in this forum i got some answers,in others not even a reply.also,many have faced the same problem as me,as i've searched enough before i post here,but nobody have the same source of the problem.i'm sorry if i ask silly questions,but my aim is to fix my amp and not to be a pro.so, if anyone wanna help me,i'll appreciate this.well,i think since it's a forum for advanced and not beginners,i think it would be easy enough for you to answer me,what's the reason of my poorly lit 12AX7Bs.anyone have an idea?

Working on tube guitar amps is dangerous. These things can kill you if you're not super careful. If folks are not giving you answers, there are two main reasons:

(1) It's complicated. There are many reasons for the behavior you observe. To investigate requires exposure to potentially lethal voltages (meter readings). Novices should NOT be doing that. Power supply caps can store enough power to kill a person for days/weeks after the amp has been disconnected from wall power.

(2) It's dangerous and no one wants to be responsible for suggesting procedures that will expose a novice (someone that doesn't know how to work carefully on these type devices) to life threatening danger.

Best to take that amp to a qualified technician. It isn't worth the risk to try and fix it yourself. OR ....... learn about tube amps first ...... and then apply that knowledge and carefulness to doing a DIY repair.

0.02

[cbass]

Some tubes filaments aren't as bright as others doesn't mean there is anything wrong.

Pictures would help from different angles so we can see all the wiring

[ben85]

thank you cbass,i just realized myself,too.just changed the 12AX7Bs and they are bright now.so,i guess tha the problem is between the 12AX7Bs and the 6V6GTs?cos as i play they re not getting any more blue than when the amp is idle.

NickC, i'm a begginer at building amps,but not at protecting myself, i know it's dangerous and how to work with this,don't worry.thanks for concering anyway!

[cbass]

Don't play through the amp any more.If your OT is not hooked up or wired wrong you can cause some serious damage.

You are not getting any hum hiss or any kinda noise at all to the speaker?

Before you turn the amp on again you need to make one of these.

https://tubeamparchive.com/viewtopic.php?t=20341


Post some pics