Found the problem with the low power . I had the 100 k resistor going to pin 6 and across from pin 7 and then to pin one instead of having the 100k resitor going to pin7 and then to 6 . Wow that amp is loud !
A little more cleaning up and I should be on my way
Search found 4 matches
- Tue Jan 28, 2014 4:00 am
- Forum: Marshall Discussion
- Topic: JTM 45 First build Low Power issues
- Replies: 6
- Views: 1817
- Tue Jan 28, 2014 3:48 am
- Forum: Marshall Discussion
- Topic: JTM 45 First build Low Power issues
- Replies: 6
- Views: 1817
Re: JTM 45 First build Low Power issues
thanks jana switching the leads fixed # 1 . I guess there is a polarity issues there .
- Mon Jan 27, 2014 3:57 pm
- Forum: Marshall Discussion
- Topic: JTM 45 First build Low Power issues
- Replies: 6
- Views: 1817
JTM 45 First build Low Power issues
Hello forum . I have been working on this build for a little while now and I am at a stand still as what the problems are . I am looking for a little guidance. I have attached the schematic im usuing . there are three main issues 1) if I hook up the feeback circuit I get a terrible hum 2) the Maximu...
- Mon Jan 20, 2014 3:09 am
- Forum: Technical Discussion
- Topic: New , Trouble from the start
- Replies: 6
- Views: 1155
New , Trouble from the start
Ok looking for a little guidance . Just finished building this and i have just about no sound. I have a sig generator at the input and I have a good amplified signal at the first gain stage . It seems like as soon as the signal hits the next stage Its gone . I know the preamp tubes and the phase inv...