Tube Amp Archive

Black wire at end of bus bar near Transformer is the common ground for the power supply B+ etc I think been a while now . I have had a change about and put all the PT grounds to the lug where it looked like it was a ground this is not connected to the bus bar .As far as hum it is fairly good now not...

Hey guys thanks for the advise I will now go away and try to digest all of that .Seriously thanks for your time when you say the preamp groundbus is grounded at 2 points are you looking at the connection by the PT end as this is not grounded or is it somewhere else i am not seeing .

Is there any advantage in trying to reroute the MV and Pres wires?

I tried the OT primary 's but this just made a horrible noise . do you think the grounds i have at the PT end with the power cord ground should go to the main groundbus ?

Do you mean the connection at the PT end this does not go to ground at this point .

This is a better image up to date also go easy on me please I know it is less than perfect.

This is not the most recent there have been a few minor changes since this was taken . I will have to pull it apart which I will do tomorrow and take some better photos.

Nikk

Has anyone come across an issue with the AA electronics build like mine. By the way it is a great board and likely it is my error not the board or build that has caused the issue. I am building the ODS 3rd gen based on the 124 . The problem is that at certain settings of the master volume there is a...

Hi , I have built the 124 it sounds great but he Overdrive channel seems a lot quieter when it is selected has anyone else had this issue . Adjusting the pot seems to make some difference but it is still not right . Any advise would be gratefully received .

Nikk

I am lookin also at the footswitch I have a Trinity amps footswitch but this seems to be counter to the schematic i have . looking at the attached what would be the best way to go just have the switches in the footswitch in parallel with the amp and use pins 1 and 5 to power the LED's not sure why t...

Hi all, I am looking for a little advise . I am 99% there with the build sounds great I still however have the issue with the master and presence controls . What i have noticed is that when the control is turned there are specific point where the controls make a whooshing or radio like noise for a s...

I am lookin also at the footswitch I have a Trinity amps footswitch but this seems to be counter to the schematic i have . looking at the attached what would be the best way to go just have the switches in the footswitch in parallel with the amp and use pins 1 and 5 to power the LED's not sure why t...

Hi all, I am looking for a little advise . I am 99% there with the build sounds great I still however have the issue with the master and presence controls . What i have noticed is that when the control is turned there are specific point where the controls make a whooshing or radio like noise for a s...

Hi Thanks for the post. I had it wired as per the Layout but it was working no idea why it was correct to the layout but is this actually correct. The capacitors are grounded on the PAB and the OD on the schematic which makes sense the layout however are not the same . Dont pins 1+2 and 4+5 need to...

Hi I know the feeling when it is dark also it is such a pain still it comes to us all .

I have converted it to JPG this may be better .


Nikk