Name: Ed Goforth
Email: goforthsound@yahoo.com
Subject: RD-50 110
Thread: 297
Time: Sun, 2 Dec 2001 04:31:28 UTC
Hi you all! I have this MusicMan RD-50 110, and looking at the schematic, the Q 5 and 6 driver circuit, shows R-72 and R-69 75k, and D16,17 1n914 and R-49, 52 to ground. This amp does not have the components I just listed. The dates on the chassis is 12/10/80 serial# EN01589. Is there any benifit having the newer components installed? It looks like it would, since the 12ax7 plates are seeing about 75vdc on V1A, and 160vdc on V1B. The overdrive sounds too compressed past 5, so I want to tame it down and make it more usable. Even changing the tubes does not help, I really think the voltages need to be higher, so is this the right voltages? My schematic does not show voltages for the 12ax7. I think the filter caps too might need changing, since there is a slight hum, especially in the overdrive, when playin at higher volumes. I also noticed a slight fuzz in the background, in clean or limit channels, any ideas? As far as the driver circuit I mentioned above, it looks like a feedback limiting type of circuit, maybe to limit peaks, to respond similar to a tube? Any info greatly appreciated!
Ed