Here is my new amp build : 100w 4xel34,6x12ax7, 3 channel, high end caps,C-core transformers and point to point wiring.
Biggest challenge was this time to make PTP wiring in small chassis(470x195x60mm).
I am still working on switching, but end result will be with headshell (Italian poplar) only 11.5 kg for full 100w head
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Very nice work! I'd love to see a schematic or just a description of the topology of each of your three channels. Is one of the channels a gain stage added? I'm kinda guessing based on the controls.
romberg wrote: ↑Thu Dec 14, 2023 3:44 am
Very nice work! I'd love to see a schematic or just a description of the topology of each of your three channels. Is one of the channels a gain stage added? I'm kinda guessing based on the controls.
Mike
I don't have schematic, started from zero. 1-Clean channel ,2-drive channel-First stage parallel-2-3-4-and cf, 3-channel-first parallel-2-3-4 plate driven and different tone stack
it is very expensive build, free flow build i like that..with all the expensive parts from HiFi collective..IMO maybe no need to go this route, i discovered that some cheap parts works better (EJ parts ) .. been there..
also i never liked exposed terminals on Lundahl , service guy can be electrocuted in a second..
bepone wrote: ↑Thu Dec 14, 2023 11:56 am
it is very expensive build, free flow build i like that..with all the expensive parts from HiFi collective..IMO maybe no need to go this route, i discovered that some cheap parts works better (EJ parts ) .. been there..
also i never liked exposed terminals on Lundahl , service guy can be electrocuted in a second..
Guitarxtc wrote: ↑Thu Dec 14, 2023 12:06 pm
Lundahl are there only for weight saving
and price increase you can use torroids it is the same weight (light) and 5* cheaper (using magnetic flux of 1.5T like here (around) to have low number of turns and smaller core
possible problem in using high saturation core like here /discovered in the past / that attack on the note is very fast, so not good for some types of music..for metal is ok
Guitarxtc wrote: ↑Thu Dec 14, 2023 12:06 pm
Lundahl are there only for weight saving
and price increase you can use torroids it is the same weight (light) and 5* cheaper (using magnetic flux of 1.5T like here (around) to have low number of turns and smaller core
possible problem in using high saturation core like here /discovered in the past / that attack on the note is very fast, so not good for some types of music..for metal is ok
I will look into Toroidal, maybe try hybrid rectifier: tube and SS at the same time ?