Elephas Posted April 2, 2009 Report Posted April 2, 2009 That's because when someone becomes part of Team Electrostats, their days on head-fi are numbered or they've already left. Team Big E rules!
kevin gilmore Posted April 2, 2009 Report Posted April 2, 2009 Ray just posted the 5687 tubes are configured in a SRPP topology. MAJOR FAIL. The top tube violates the filament to cathode spec. Nothing can be done about this either, as they are dual triode tubes.
kevin gilmore Posted April 2, 2009 Report Posted April 2, 2009 I've thought about that as well but you would need multiple taps on the secondary to cope with all the different headphone impedances. I sent Justin some of my spare transformers to test the amps with but I don't know if he had any success with that approach. Lets everyone send justin various things to test and play with. Lets start with bench power supplys. I'm planning on an entire pallet piled high with supplies in a few weeks. Sure hope justin's apartment has a loading dock..
justin Posted April 2, 2009 Report Posted April 2, 2009 Lets everyone send justin various things to test and play with. Lets start with bench power supplys. I'm planning on an entire pallet piled high with supplies in a few weeks. Sure hope justin's apartment has a loading dock.. I already had a pallet arrive yesterday and they had to leave it in the street
Pars Posted April 2, 2009 Report Posted April 2, 2009 I already had a pallet arrive yesterday and they had to leave it in the street Good thinking; you're already getting the neighbors used to it. Now when the second and succeeding pallets appear, no problem
nikongod Posted April 2, 2009 Report Posted April 2, 2009 MAJOR FAIL. The top tube violates the filament to cathode spec. Nothing can be done about this either, as they are dual triode tubes. there is a way to do it without violating Vhk limits, but he has never done it right before. taking the (safe) assumoption that the output stage in this amp is called on to give some gain, the cathode of the "top" triode is going to be at FAR higher voltages than in the Craptor or "2 craptors back to back" (B52). the failboat is coming into port. Ray dosnt seem to be one to take any kind of advice or learn from the mistakes of others (even those he happily mocks himself) very well.
kevin gilmore Posted April 2, 2009 Report Posted April 2, 2009 (edited) Nope try again... One triode of the two in the same tube is the high side, and the other is the low side. If the low side tube cathode is pretty close to ground, as one would expect with a srpp with gain, then the most the top cathode of the other triode in the same glass would be +90. Output voltage swing would be very minimal. Not rays "louder than loud" style. Would limit B+ to less than 200 volts... In fact on the cRaptor, the B+ is 250 volts, and the top cathode is at 150 volts, 60 volts over spec. Edited April 2, 2009 by kevin gilmore
Elephas Posted April 2, 2009 Report Posted April 2, 2009 Lets everyone send justin various things to test and play with. I think Justin deserves an SR-Omega. Now might be a good time to buy one, possibly there's less demand and consequently lower prices.
pabbi1 Posted April 2, 2009 Report Posted April 2, 2009 Sure does... Me hate you both long time. Await the wrath of Warthog.
spritzer Posted April 2, 2009 Report Posted April 2, 2009 Me hate you both long time. Await the wrath of Warthog. That was less then half my collection at the time and you should have seen the stack of T1's and other amps. Now it's all gone.
pabbi1 Posted April 2, 2009 Report Posted April 2, 2009 Better to have had, and lost... or somesuch. But, dayum... just dayum.
nikongod Posted April 2, 2009 Report Posted April 2, 2009 (edited) Nope try again... One triode of the two in the same tube is the high side, and the other is the low side. agreed, ray does it as you say, and wrong. in an effort to use an SRPP circuit safely even with very high B+ this would certainly do: both triodes in 1 bottle for the "top halves" of 2 SRPP blocks with their own floating heater supply. both triodes in another bottle for the "bottom halves" of the 2 SRPPs sharing the heater for the gain/input tube. Its soooo stupid the way he (ray) does things. an additional heater supply and some more wires in the umbilical to do it right costs a bit, but I doubt thats really a significant cost for an amp that many people are speculating to cost more than $5000. After that its just a mater of NOT wiring things in the stupidest way possible, which he seems unable to do. he *could* have floated or "referenced" the heater on the craptor/B52 and been within safe limits of Vhk, but he chose to use an idiotmode switching supply and shared ground wires. Edited April 2, 2009 by nikongod
justin Posted April 2, 2009 Report Posted April 2, 2009 (edited) agreed, ray does it as you say, and wrong. in an effort to use an SRPP circuit safely even with very high B+ this would certainly do: both triodes in 1 bottle for the "top halves" of 2 SRPP blocks with their own floating heater supply. both triodes in another bottle for the "bottom halves" of the 2 SRPPs sharing the heater for the gain/input tube. Its soooo stupid the way he (ray) does things. an additional heater supply and some more wires in the umbilical to do it right costs a bit, but I doubt thats really a significant cost for an amp that many people are speculating to cost more than $5000. After that its just a mater of NOT wiring things in the stupidest way possible, which he seems unable to do. he *could* have floated or "referenced" the heater on the craptor/B52 and been within safe limits of Vhk, but he chose to use an idiotmode switching supply and shared ground wires. I think you're forgetting the AC voltages. you could do it but you'd need 8 tubes total if you want to use 5687 (parallel both halves of each tube) and 4 floating highly isolated filament supplies. hmm where have i heard this before. anyway, if there is a separate heater supply for the top tube, ignoring the AC voltages, i think it would be OK as in you're not going to hear about it if a tube breaks, it will just get replaced, unless it takes amp/PSU components with it and then can't be repaired...like that other amp Edited April 2, 2009 by justin
kevin gilmore Posted April 2, 2009 Report Posted April 2, 2009 (edited) agreed, ray does it as you say, and wrong. in an effort to use an SRPP circuit safely even with very high B+ this would certainly do: both triodes in 1 bottle for the "top halves" of 2 SRPP blocks with their own floating heater supply. both triodes in another bottle for the "bottom halves" of the 2 SRPPs sharing the heater for the gain/input tube. And justin beats me to the answer again. Its the AC signal that is the problem especially since the 2 halves of the tubes are 180 out of phase. So one cathode goes up by 90 volts,and the other goes down by 90 volts. Any more output signal than that and you violate the tube ratings. (for 5687's) You could mix the tubes, using one section for L+ and R+, then as long as the music is mono... There absolutely is a way to do this, has to be single triodes. OR single DHT's. Maybe i should publish my all DHT amp schematic, but really don't want the competition (hack cough) to actually learn how to do it right. Sucks to have a day job, otherwise i could be like billy and be on head-case all day. Edited April 2, 2009 by kevin gilmore
spritzer Posted April 2, 2009 Report Posted April 2, 2009 Better to have had, and lost... or somesuch. But, dayum... just dayum. I don't regret buying any one of those phones and I've made a lot of people very happy (and addicted) by selling them off. DHT = Serious Wood! An all DHT electrostatic amp with EML tubes = DR. Wood.
boomana Posted April 14, 2009 Report Posted April 14, 2009 so it looks like earsmucker is finally getting the estat amp of his dreams
Dusty Chalk Posted April 14, 2009 Report Posted April 14, 2009 There is nothing pent up about our disdain.
909 Posted April 14, 2009 Report Posted April 14, 2009 There is nothing pent up about our disdain. "our" resident, voice of the people.
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