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Discussion in 'Glowing Bottle Tube Amp Forum' started by milocj, Dec 26, 2018.
Bought it for myself for my birthday.
Of course this isn't the one you can just grab at GC or online.
Congrats and Happy B-day!
Where can you "grab" one. I need a nice upstairs amp.
I keep thinking I should convert my ac4 c12 - keep the box but build a new amp to go in it.
Interesting how the on/off is on the tone knob on yours.
Happy Happy Birthday
Not really sure why they did that. I just checked the schematic and the tone and volume both use the same value pot, but who knows what they were thinking back in 1964 when they made it. The EF86 preamp tube brings a nice twist to the low watt amps.
Nice! That's a lucky find there!
It can be done! I converted my AC4C1-BL into a handwired circuit. It would be easier with the AC4C1-12 and it's larger cabinet.
Nice! Now go get it serviced
Yep. Trying to figure out if there's a drop-in replacement for the 32/32uf @ 350v cap can, otherwise I have a Ruby that will work with some zip ties or silicone.
Looks like it's screwed in on the sides? If so, this and a holder would work if it is the right dimensions:
Or lots of other options similar.
I didn't know it was an EF86.
My Vox-inspired Trinity amp has an EF 86 channel and I love it.
What is the headroom/clean tone like on yours? My Trinity's EF86 channel is pretty crunchy from the get-go.
Do you have the model info? If you could post a copy of the schematic that would be awesome.
I'm guessing from ''speed' yours has tremolo. How does it sound?
Here's another one:
Amplified parts always has a file with the measurements for all their products. If you can't find one that's exactly the same dimensions you ought to be able to get a new clamp and make it work
Really cool amp. Looks like this is close.
Congrats on a great find. Have a blast!
That's the '64(?) and later JMI AC4. The circuit goes back to the original 1958 AC, with mainly cosmetic differences through the years.
Beautiful example. I plan to eventually build one for myself.
Snfoilhat got the right schematic. Mine's a '64. They were all pretty similar even though JMI called them an AC2 at first, followed by the AC6 before settling on AC4. I think the only big change was the location of the tone control in the circuit.
The tremolo is alright with the biggest issue as to not being able to set the depth. That makes the slowest settings awfully "throbby".
Headroom is surprisingly good, at least with my Teles which don't have very hot pickups. With those and the amount dimed it gets about as dirty as most of Cropper's stuff that he used the Harvard on: just starting to get a little crunch to it. Surprisingly loud, as well, and all with the original 8" Elac and all the original electrical bits. I think the only thing that isn't original is the VOX emblem.
Not a whole lot of these out there anymore.