I would have thought, but I find that separately dialing them up makes
you more aware of the balance. It doesn't bother me at all.
Perhaps Mark Levinson's preamp had something.....
After building the Korg 6P1 preamp I realize that the NuTube is nothing more than a vacuum fluorescent display (VFD) with two active elements. Has anyhow ever tried to make an amplifier triode from a run of the mill 1980’s calculator/VCR/appliance display?
10-Bit Vacuum Fluorescent Display VFD Display LCD Nixie Tube Display Module | eBay
Seems one could parallel enough 7 digit segments to get the plate current that was desired.
Wikipedia says that some ham radio people made amps with a VFD device (not Korg NuTube).
10-Bit Vacuum Fluorescent Display VFD Display LCD Nixie Tube Display Module | eBay
Seems one could parallel enough 7 digit segments to get the plate current that was desired.
Wikipedia says that some ham radio people made amps with a VFD device (not Korg NuTube).
Last edited:
They are triodes - All VFDs are triodes not diodes. They are switchable on/off per segment.
VFD As A Sound Amplifier | Hackaday
VFD As A Sound Amplifier | Hackaday
Attachments
Last edited:
Been looking since your posting bringing it up - hop diggity dog, they are triodes! I stand corrected. 
Look here, somebody has already dome some work on the idea -
A VFD Receiver (Triodes in Disguise)
VFD as an audio/RF amplifier? | Electronics Forums
Look here, somebody has already dome some work on the idea -
A VFD Receiver (Triodes in Disguise)
VFD as an audio/RF amplifier? | Electronics Forums
WOW, X, never knew this but it makes sense.........
The only issue might be linear operation, like a Trench mosfet these VFDs are set up as switches so you might have to take care about plate dissipation, just the same issue as the Korg.
Generally distortion from triodes seems to follow the loading. It should be around 2-3 times the plate impedance, and that's probably the reason the distortion dropped markedly when you increased the plate load from 270k to 470k.
Terrific find and much cheaper.........
Hugh
The only issue might be linear operation, like a Trench mosfet these VFDs are set up as switches so you might have to take care about plate dissipation, just the same issue as the Korg.
Generally distortion from triodes seems to follow the loading. It should be around 2-3 times the plate impedance, and that's probably the reason the distortion dropped markedly when you increased the plate load from 270k to 470k.
Terrific find and much cheaper.........
Hugh
Done, Pascal Nguyen showed exactly that December 16, 2018 in LateSit.... Anyone up to the challenge of presenting a schematic..?
Out of production now I think all the kits where designed around NOS they acquired.
I put an order in for this to see what it looks like. I'll post some detailed pictures of it whenever it arrives.
Finished for now:
Swapped out all the cables and the ALPS for TKD pot and put the Elma switch in. I've mounted the Korg on 6mm perspex strip with foam sandwiched behind it using double sided tape. I've put that whole assembly behind the front window using standoffs.
The gold plated solid core is a pain in the bum to use but that and getting shot of the Alps pot has this thing kicking ***. Feet are really moving all by themselves.
FYI I'm listening to Tidal from Nativ Streamer and my Sugden SDT1 CD player via Cambridge DAC Magic.
Thanks Nelson - 106db Horns and single ended class A transistor Amps and Korg Triode what fab mix
Swapped out all the cables and the ALPS for TKD pot and put the Elma switch in. I've mounted the Korg on 6mm perspex strip with foam sandwiched behind it using double sided tape. I've put that whole assembly behind the front window using standoffs.
The gold plated solid core is a pain in the bum to use but that and getting shot of the Alps pot has this thing kicking ***. Feet are really moving all by themselves.
FYI I'm listening to Tidal from Nativ Streamer and my Sugden SDT1 CD player via Cambridge DAC Magic.
Thanks Nelson - 106db Horns and single ended class A transistor Amps and Korg Triode what fab mix
Very nice work Steve! With the Perspex bottom chassis where you have mounted the B1K board, do you no longer have electrical continuity between the board mounting holes and the metal portion of the chassis? I ask as I want to insert some vibration-isolating stand-offs to mount my B1K board to reduce Korg Triode microphony. Some on this thread have mentioned that the board requires a connection to chassis ground via the mounting holes and stand-offs, but there is no earth ground for the chassis using the pioneer kit-supplied wall wart power supply.
Also, was the switch from the Alps to TKD volume pot worth the extra expense? I really like the B1K as-is with the kit-supplied Alps pot, but some have said that a better pot or stepped attenuator should improve the B1K’s performance.
Also, was the switch from the Alps to TKD volume pot worth the extra expense? I really like the B1K as-is with the kit-supplied Alps pot, but some have said that a better pot or stepped attenuator should improve the B1K’s performance.
Last edited: