Hi. I have a Musicman 112 RD 100 with the black lettering on a silver background badge.
I have a couple of questions I'm hoping someone can help me out with:
I don't know what tubes were in it when I got it, but when I had a tech work on it some years ago, he put in EL34s. Based on the badge color and therefore the "era" of the amp, shouldn't it actually use 6L6 tubes? Sorry, but I'm not that well versed in tubes, etc.
Thanks in advance and apologies if I've posted these questions before. I didn't find them when I searched for them.
LL
EDIT: I did find the old thread I had about the tubes after all, but it still seems like I've read some things since then which lead me to believe that it should be 6L6 tubes in there....so I'm asking again here. Sorry about the double post (one was 7+ years ago though...).
Musicman 112 RD 100 Questions
The schematics for the earlier versions, GD-1 shows 6CA7 power tubes, and GD-2 shows 6CA7/EL34 i.e. interchangeable.
The Schematics are available on this site in the Downloads area. Look for the 2100-D schematic
a discussion of the differences between 6CA7 and EL34...
https://www.tubesforamps.com/el34-6ca7-kt77-differences
Apparently they are different but interchangeable...
My RD100 112 is the later version with the 6L6 power tubes
Silver badge
Hello,
Silver badge means EL-34 or 6CA7. Either one will work well. Black badge may be either EL-34/6CA7 or 6L6 depending on the vintage, however, 6L6 is most likely as black badge with 'old' tube was only made for a year roughly overlapping the year 1979. The same goes for RP amps. The later RD-50 (chassis 1650RD) are all 6L6. As far as I know, the only variant of the RD/RP 2100 chassis family that never came with EL-34/6CA7 was 100B but others may correct me here.
Cheers,
Lars Verholt