July 22, 20178 yr If dual tube input. One tube as upper device and the other as lower like T2 or one tube each side?
July 22, 20178 yr I wanted to compare the dual input tubes (like in the T2) against the single. I'd build the dual first first though.
July 22, 20178 yr Author one comment about the tubes, have tried many tubes on testbench, 12au7,12ax7,12at7,7308 etc you need a mu of at least 33 and a transconductance of at least 12500
August 31, 20178 yr Anyone about to build this, Megatron, etc and don't want to use a dropping resistor, I might have some spare power supply boards for tube front ends soon. Works up to 250V no problem, 300V is possible if you find caps that fit and heatsink appropriate parts properly.
October 4, 20178 yr 56 minutes ago, Pars said: Sounds like the consensus was t-POS... Sent from my iPhone using Tapatalk What ? T-Perfected-Over-Standard ? JK, but that is sad....we need Stax to be serious again Edited October 4, 20178 yr by Whitigir
December 2, 20178 yr On 2017-07-06 at 7:26 PM, kevin gilmore said: power jumper block cleaned of all the epoxy j1,j3,j4 for 100v remove all others j2 j3 j5 for 120v remove all others j5,j6 for 240v remove all others and servo board pictures, unnecessarily complex tube rollers are going to have a lot of trouble with this, the servo has a pretty limited range, and the Russian similar's definitely will not work How to make the servo less complex?
December 2, 20178 yr Author servo attaches directly to the plate of the tube. similar to T2. no way to make less complex.
December 2, 20178 yr Author better idea would be to use the servo from the kgsshv-carbon but does not compensate for the tube drifting section to section
May 1, 20188 yr Draft of dual 6922 input (similar to T2 input), with current tunnel (as Carbon etc.) Voltage cross 2sa1486 580V and 700mW of heat.
August 25, 20187 yr Trying to use the above draft in a board layout. The print out is roughly a quarter of the original DIY T2 board in size. Output section reminds of T2 less unnecessary parts. This is progressing very slowly and I’m thinking it might go into trash can before it gets to the CNC router. Hmm.. probably trash can.
August 25, 20187 yr More paper work. Width incl. heat sinks 9.5in and length 7.9in. No angel brackets sands mounted direct on heat sinks, saves 1.6in.
August 25, 20187 yr I like it, you are going in the other direction from the original T2, small amp chassis and a huge PSU.
August 26, 20187 yr Very nice Joachim! With the micro golden reference HV power supplies (which do work very nicely) and lower voltage (less caps) you could get the power supply size down a bit as well
August 26, 20187 yr Thanks. Yep, your micro power supplies are very interesting. My idea is to make a PSU with +/-15V, +220V, +400V and -460V. Shooting from the hip - how about producing 580V (BIAS) by GRHV?
August 27, 20187 yr All components are now on the right channel board. More work is to be done but so far it has gone quite nice. By the way, I think I've learned netlisting and I love it - tells me when I'm out of track.
August 27, 20187 yr Netlisting is even better if we were ever to bother with schematics...which we never do.
August 27, 20187 yr 29 minutes ago, spritzer said: Netlisting is even better if we were ever to bother with schematics...which we never do. You guys have it in you - the schematic in your heads. I’ve no head and therefor I use schematic which I derive from your layouts hihihihi Edited August 27, 20187 yr by JoaMat
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