mypasswordis
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Posts posted by mypasswordis
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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.
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Toroid, separate pcb for input tube, and aluminum chassis touted as amazing design features! And it does claim a gain of 1000... interesting stuff
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There's literally dozens of sub-genres of post tonal music that have been around for over 100 years and whole tone scales have been used for hundreds of years....
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I think you can buy wires pre-crimped in various lengths for some connectors, forgot the part number... maybe someone else remembers
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You're freaking me out, man... went back and checked my last mouser order which I know are black, part number here http://www.mouser.com/ProductDetail/Phoenix-Contact/5452258/?qs=iCzJi%2FIZBF77ZcTXZHmYbQ%3D%3D seems I just happened to get the black version without realizing it when ordering
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thanks for reminding me to do the same on my boards, btw isn't the 400V version of phoenix connector supposed to be black or did I just happen to get the black version?
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I think Brent was joking with Shabba (not 100% sure) but I've been listening to ISSA almost every day for the past few weeks, it's pretty legit
Here's some comedy gold tho:
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Did you check out the new kodak black mixtape tho... straight fire fam ???
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Played a game of chess with https://en.m.wikipedia.org/wiki/Odysseus'_Gambit
I hadn't played in 6 years but he lured me in and I couldn't say no. Obviously i got destroyed, only took down a bishop, rook and a couples pawns before getting rekt. Fascinating to hear him talk about his story
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Did you make a chassis ground on the amp, tie that to amp star ground and psu star ground which is connected to psu chassis ground?
Edit: wow this is a great pic
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Okay I solved the problem by adding a DC heater supply, new dimensions 51x90mm
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I needed a medium voltage single supply GRHV, not sure if that already exists but if it didn't it does now. Some day I will get better at layout :/ Kerry could have made this half the size.
50x91mm, just 3 vias in total so I'll claim that was my intention all along as to why the board is so big but I'll take any suggestions how to shrink it
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Stay safe, Brent. You may identify with being white but these white supremacist shitbags are even getting DNA tests, which ironically prove that they are not as white as they think they are.
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@MexicanDragon what has it been like for you these past few days? Can't imagine good things with articles like this: http://www.knoxnews.com/story/news/politics/2017/08/16/tennessee-lawmaker-facebook-post-robert-e-lees-battle-flag-symbol-freedom/574774001/
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When do we get to read some of your lyricism?
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7 minutes ago, swt61 said:
Morrissey?
Some Tibetan yogi or other from a thousand years ago: https://en.wikipedia.org/wiki/Milarepa
I've been trying to get back into poetry a bit, being reminded of Yeats' famous poem The Second Coming these past few days... any recs?
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I think I see zener strings and the transistors on the tiny heatsinks might be pass FETs with protection diodes on the bottom
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“All worldly pursuits have but one unavoidable and inevitable end, which is sorrow; acquisitions end in dispersion; buildings in destruction; meetings in separation; births in death.”
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14 hours ago, JimL said:
Given that the gain of the cross-coupled circuit is the same as the standard cascode, I calculated the gain as about 41-42 dB, and an output impedance per side of close to 147 kilohm, using the estimated rp and gain for the low current used in the SRX circuit. That's with my 250 kilohm plate resistors rather than the original 300k. If you use the standard published 12AT7 parameters, you'll get a slightly different answer.
The input capacitance of the input circuit is low because of the cascode connection. The issue is the high output impedance of the input stage into the output tube Miller capacitance. With the 6SN7GTA/B, the Miller capacitance is about 84 pf, and the circuit rolls off above 11-12 kHz. There is about 14 dB feedback at low frequencies, and so the calculated closed loop gain rolls off above about 53 kHz, which is what I measured.
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You're not getting the point. Yes, everything can be "true" if you assume it to be true. You're simply assuming it's a cascode and then using a cascode calculator to get all your numbers.
I found the schematic you're referring to in the Birt article you sent (thanks), and it's a totally different circuit from the SRX. This actually is a cascode, with some interesting voltage divider grid biasing action. Notice how it is a common cathode into a common base. I will try to simulate this in spice as well when I get the chance.
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I just spent awhile trying to find the article, can't find it so clearly it is a very popular and well-regarded article in textbooks and circuits today.
This is fun, I love playing devil's advocate even though it is clearly not a cascode. What do you think the open loop gain and output impedance of the front end of the SRX is, disregarding and with Miller capacitance? I'm going to put it into spice and do a comparison with a real cascode.
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The definition of a cascode is a common emitter into a common base (or the tube equivalent), please tell me where you find that in the SRX.
4 minutes ago, JimL said:The SRX input IS a cascoded LTP, AKA Hedge circuit, with cross-coupling per D.R. Birt's article "Self-Balancing Push-Pull Circuits" June 1960 in Wireless World to improve balance for a single-ended input. The T2 also has cascoded LTP/diff amp input but CCS tail and plate loads but w/o cross-coupling.
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Couldn't the input tubes be cascoded like the T2 instead of the Srx's LTP into a common cathode with the plate/cathode resistor doing double duty?
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So sorry to hear, condolences to you and your family
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What started as a spoof and thumbing our noses at Schiit (not literally) and the T8000 is starting to turn into a real amp! Thanks to Kevin for helping me not be an idiot, this time around at least. Gordian knots be damned!
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Works up to 250V no problem, 300V is possible if you find caps that fit and heatsink appropriate parts properly.
This is fun, I love playing devil's advocate even though it is clearly not a cascode. What do you think the open loop gain and output impedance of the front end of the SRX is, disregarding and with Miller capacitance? I'm going to put it into spice and do a comparison with a real cascode.
KGSSHV Carbon Build Thread
in Do It Yourself
Posted
Probably because the electrical conductivity of air is still less than that of the dieletric material. Moral of the story is just use less solder, added bonus you run out of solder less quickly.