JoaMat Posted July 22, 2017 Report Posted July 22, 2017 If dual tube input. One tube as upper device and the other as lower like T2 or one tube each side? Quote
Kerry Posted July 22, 2017 Report Posted July 22, 2017 I wanted to compare the dual input tubes (like in the T2) against the single. I'd build the dual first first though. 2 Quote
kevin gilmore Posted July 22, 2017 Author Report Posted July 22, 2017 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 3 Quote
mypasswordis Posted August 31, 2017 Report Posted August 31, 2017 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. 4 Quote
Whitigir Posted October 4, 2017 Report Posted October 4, 2017 How come T8000 fires is slowly fading away ? We need more fuels ? Quote
G600 Posted October 4, 2017 Report Posted October 4, 2017 29 minutes ago, mwl168 said: Where was the fire? +1 Quote
Pars Posted October 4, 2017 Report Posted October 4, 2017 Sounds like the consensus was t-POS...Sent from my iPhone using Tapatalk Quote
Whitigir Posted October 4, 2017 Report Posted October 4, 2017 (edited) 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, 2017 by Whitigir Quote
nopants Posted October 4, 2017 Report Posted October 4, 2017 i'm mostly just waiting for the version with ss output and tube ccs 1 Quote
spritzer Posted October 4, 2017 Report Posted October 4, 2017 Sounds crazy, we could do it... 1 Quote
JoaMat Posted December 2, 2017 Report Posted December 2, 2017 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? Quote
kevin gilmore Posted December 2, 2017 Author Report Posted December 2, 2017 servo attaches directly to the plate of the tube. similar to T2. no way to make less complex. Quote
JoaMat Posted December 2, 2017 Report Posted December 2, 2017 Moving the servo to the cathode would that be a good idea? Quote
kevin gilmore Posted December 2, 2017 Author Report Posted December 2, 2017 better idea would be to use the servo from the kgsshv-carbon but does not compensate for the tube drifting section to section Quote
JoaMat Posted May 1, 2018 Report Posted May 1, 2018 Draft of dual 6922 input (similar to T2 input), with current tunnel (as Carbon etc.) Voltage cross 2sa1486 580V and 700mW of heat. 4 Quote
JoaMat Posted August 25, 2018 Report Posted August 25, 2018 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. 2 Quote
JoaMat Posted August 25, 2018 Report Posted August 25, 2018 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. 5 Quote
spritzer Posted August 25, 2018 Report Posted August 25, 2018 I like it, you are going in the other direction from the original T2, small amp chassis and a huge PSU. Quote
Kerry Posted August 26, 2018 Report Posted August 26, 2018 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 2 Quote
JoaMat Posted August 26, 2018 Report Posted August 26, 2018 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? Quote
JoaMat Posted August 27, 2018 Report Posted August 27, 2018 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. 5 Quote
spritzer Posted August 27, 2018 Report Posted August 27, 2018 Netlisting is even better if we were ever to bother with schematics...which we never do. Quote
Whitigir Posted August 27, 2018 Report Posted August 27, 2018 Wooooaaaaa this is looking wesome, I am loving it ! Quote
JoaMat Posted August 27, 2018 Report Posted August 27, 2018 (edited) 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, 2018 by JoaMat Quote
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