12-19-2017, 09:04 PM
OK. I've replaced all the triodes with stronger tubes and I can say definitively that the "thinness" issue is gone. Sounds like an amplifier. But....
It's got a rattle that I am pretty much convinced is voice coil rub. Soooooo, I need to do something about the speaker. I'll have to tear the amp apart again and inspect the speaker carefully (something I should have done while it was apart, duh!). Maybe I'll start watching those youtube videos on how to recone a speaker. Reconing isn't that expensive, but the shipping would be a big hit. Cheaper to buy a replacement. But this funky Jensen ceramic speaker with the alnico sticker is part of the amp's charm.
Can anyone recommend a source for a recone kit for a C15N, or a competent recone professional in the Washington DC area?
The other thing is that, even though the amp is no longer thin sounding, it is still very bright. I've modeled the amp and it really is just voiced that way. Less bass, more treble. I was expecting this amp to have a tone stack similar to the B15N, but the values are completely different. I'm starting to consider "modding" the amp to insert the B15N tone stack. I'm not sure that qualifies as a "mod", given that the original circuit of this amp isn't documented anywhere.
It's got a rattle that I am pretty much convinced is voice coil rub. Soooooo, I need to do something about the speaker. I'll have to tear the amp apart again and inspect the speaker carefully (something I should have done while it was apart, duh!). Maybe I'll start watching those youtube videos on how to recone a speaker. Reconing isn't that expensive, but the shipping would be a big hit. Cheaper to buy a replacement. But this funky Jensen ceramic speaker with the alnico sticker is part of the amp's charm.
Can anyone recommend a source for a recone kit for a C15N, or a competent recone professional in the Washington DC area? The other thing is that, even though the amp is no longer thin sounding, it is still very bright. I've modeled the amp and it really is just voiced that way. Less bass, more treble. I was expecting this amp to have a tone stack similar to the B15N, but the values are completely different. I'm starting to consider "modding" the amp to insert the B15N tone stack. I'm not sure that qualifies as a "mod", given that the original circuit of this amp isn't documented anywhere.