Here are some pics of my latest mono Dumblelator build. It is slightly different from the first one I build in that it uses values reported by drz400 here: https://tubeamparchive.com/viewtopic.ph ... c&start=30
It works great! The bright cap on the send pot is very subtle, which is something I might change. Tube is a Chinese 12AX7A.
Also, being a Dumble nut, I was quite happy to have found the original chassis used in the real Dumblelators. I like this one much more than the Hammond alternative because it doesn’t use those annoying corner brackets and the top lid is much less fidgety getting on and off. A big word of advice when using a rack chassis like this: glue it! If you don’t those panels will rattle like crazy if your amp is situated anywhere near it.
A local ham radio guy was selling a bunch of stuff and he had a NOS R-2C for $10! The bell of the transformer even had a protective sleeve made of paper around it. They sure don’t make em’ like that anymore!
After noticing the date code on the transformer, my hopes for a non-smoking start-up faded rather quickly. But in the end, 42 years of solitary confinement was all it needed to start up without issues.
Triad made the R-2C for VTVMs and produced them for 41 years (1951-1992). Given that it was produced for so long I would think they'd still be around in abundance on the used/surplus market. Probably being horded somewhere!
A local ham radio guy was selling a bunch of stuff and he had a NOS R-2C for $10! The bell of the transformer even had a protective sleeve made of paper around it. They sure don’t make em’ like that anymore!
After noticing the date code on the transformer, my hopes for a non-smoking start-up faded rather quickly. But in the end, 42 years of solitary confinement was all it needed to start up without issues.
Triad made the R-2C for VTVMs and produced them for 41 years (1951-1992). Given that it was produced for so long I would think they'd still be around in abundance on the used/surplus market. Probably being horded somewhere!
Thanks again for the kind words!
Hi UHOP,
I'm very impressed with both your recent Bluesmaster and with this Dumblelator. You are living your dream!
The black RTV is there as a "fail-safe" to insulate the trace for the plate of the recovery stage (pin 6) in order for it not to make contact with the unpainted top panel of the chassis when fully assembled. I had a slight bit of leeway with the trace but you can never be to sure! 215V=ouchie
753]http://i205.photobucket.com/albums/bb17 ... /Loop2.jpg[/img]
768]http://i205.photobucket.com/albums/bb17 ... /Loop3.jpg[/img]
