Name: Justin
Email: justnd@localnet.com
Subject: Concerning transformers
Thread: 59
Time: Sat, 9 Mar 2002 08:06:21 UTC
I would just like to ad that their are substitutes for both the LM307H Op-Amps and for the transformers. I have replaced my Op-Amps, only cause it was needed, and did'nt notice too much change in the quality of the sound. Of course they made a difference, but only good points, like; no more sloppiness when I turn the bass control up, and add sensitivity when turning the tone controls. Now they make a difference when turning them 1 number. The only flaw with them is that I noticed that the overdrive is'nt quite as smooth when turning the pre amp up for the distortion, but even the original op amps had a awful overdrive, so I would'nt realy call that too bad of a flaw. And who know, it's been a long time since the amp was new so maybe the original op amps sounded a little rough when brand new too. I dont have the # of the replacemant op amp of the top of my head right now but any tech should be able to cross-refference them. I highly recomend you try new op amps. They are very cheap, and if you dont like them you can just put the old ones back in as they just pull out of their socket's. One thing I should mention is that the new replacement op amps dont match up with the impedance of the original Reverb Tank. Therefore you only need 5. Leave the two that go to the reverb stock. If not done already, do a Cap-job, replace all of the screen grid resistors on the power tubes, install some good tubes, and have it biased and you should be suprised how much the amp sparkles. There are a few diodes that may be getting old and could be sagging at higher volume levels but it depends on how hard the amp has been pushed and how hard you will be pushing it.
If your amp seems mushy, it should'nt be that way. My amp got mushy so gradually that I did'nt even notice it. Then it finaly started making a snapping noise when throwing the stand-by switch and I brought it to my tech and he did a overhul on it and I was amazed by how much more power, punch, and sparkle the amp had wheh I got it back. It was like having twice the amp that I had before.