Hi,
Got above mentioned old lady couple of years ago as an exchange. Very warm an nice sounding little combo. I was almost selling it our, but after comparison to Vox AC15, I decided to keep it and get fixed. So I ended up to similar project descibed in this forum as "Guild Thunder 1 RVT : Fix-'Em-Up Part 1". The version of my amp is exactly the same (version 1).
The chipboard box was in terrible condition, but othervice the amp was working well. Caps have been changed quite recently in the past. Only problem was tremolo. You can adjust the speed, but not intensity. It will switch on an off, but when on, intensity pot does not do anything. There are quite subtle trem regardless pot setting. So I changed the pot, but that didnt help anything.
So I took the amp to local tech specialized to old tube amps. His comment was, that amp have been modified and therefore not been able to find problem without schematics or hours of work. So as an electrical engineer I found one schematic from net and also recognized, that circuit was not the same as described in schematics. But also found no signs of changes in the amp. Like in schematics there seems all three connections on intensity pot been connected, but only two were soldered in the cirquit an no signs of soldering in third. There were alson polarity switch in schematics, but not in the cirquit.
So some browsing here and I found out there beeing at least two different versions. :laughing:
Are somebody able to help me with the (older) different version schematics ( other than can be downloaded from net)? It would be really nice to get this fine baby fully fixed.
BR/ Markku
Got above mentioned old lady couple of years ago as an exchange. Very warm an nice sounding little combo. I was almost selling it our, but after comparison to Vox AC15, I decided to keep it and get fixed. So I ended up to similar project descibed in this forum as "Guild Thunder 1 RVT : Fix-'Em-Up Part 1". The version of my amp is exactly the same (version 1).
The chipboard box was in terrible condition, but othervice the amp was working well. Caps have been changed quite recently in the past. Only problem was tremolo. You can adjust the speed, but not intensity. It will switch on an off, but when on, intensity pot does not do anything. There are quite subtle trem regardless pot setting. So I changed the pot, but that didnt help anything.
So I took the amp to local tech specialized to old tube amps. His comment was, that amp have been modified and therefore not been able to find problem without schematics or hours of work. So as an electrical engineer I found one schematic from net and also recognized, that circuit was not the same as described in schematics. But also found no signs of changes in the amp. Like in schematics there seems all three connections on intensity pot been connected, but only two were soldered in the cirquit an no signs of soldering in third. There were alson polarity switch in schematics, but not in the cirquit.
So some browsing here and I found out there beeing at least two different versions. :laughing:
Are somebody able to help me with the (older) different version schematics ( other than can be downloaded from net)? It would be really nice to get this fine baby fully fixed.
BR/ Markku
