spritzer Posted February 18, 2016 Report Posted February 18, 2016 It is an interesting comparison if only to see how great the triode strapped EL34 is. Quote
kevin gilmore Posted February 18, 2016 Author Report Posted February 18, 2016 the professional... (picture 9) http://www.head-fi.org/t/798779/sennheiser-he-60-baby-orpheus-w-hev-70-amp-original-box-immaculate the amateur seriously, ray has turned into a real sleezeball... Quote
spritzer Posted February 18, 2016 Report Posted February 18, 2016 You will be put in charge of the plugs when the mafia starts to make headphones... Quote
JoaMat Posted February 19, 2016 Report Posted February 19, 2016 11 hours ago, kevin gilmore said: Neutrik male pins, right? Can they be bought somewhere? Don't like to slaughter good XLR connectors to get them. Quote
spritzer Posted February 19, 2016 Report Posted February 19, 2016 You need to slaughter innocent XLR's to get them... Quote
chinsettawong Posted February 19, 2016 Report Posted February 19, 2016 (edited) I can get them cheaply. Let me know if you need. They are something like these: Edited February 19, 2016 by chinsettawong 2 Quote
JoaMat Posted February 19, 2016 Report Posted February 19, 2016 Nice connectors. I really like the color of the male. Help appreciated. PM sent. Quote
guzziguy Posted February 19, 2016 Report Posted February 19, 2016 (edited) 18 hours ago, kevin gilmore said: seriously, ray has turned into a real sleezeball... How do you tell? Edited February 19, 2016 by guzziguy Quote
nopants Posted February 20, 2016 Report Posted February 20, 2016 On 2/17/2016 at 3:38 PM, JoaMat said: Life is short. Would T2 accept EML 20B-V4 tall base? Yes, she does! For how long? is the el60 a viable replacement? how do you wire the adapters? Quote
JoaMat Posted February 20, 2016 Report Posted February 20, 2016 EL60 is said to have the same characteristics as EL34 but it has 9 pin socket. The adapters are bought via eBay and quality seems OK. IMO EL60s are very good sounding tubes. Quote
JoaMat Posted February 20, 2016 Report Posted February 20, 2016 Sold rk50. Got money enough for tubes, bottle of single malt and flower to wife. 2 1 Quote
sorenb Posted February 20, 2016 Report Posted February 20, 2016 49 minutes ago, JoaMat said: Sold rk50. Got money enough for tubes, bottle of single malt and flower to wife. it's spelled "flour" - probably a good idea to keep the wife occupied 3 Quote
nopants Posted February 20, 2016 Report Posted February 20, 2016 technically this also means that the dht could be a sub for the el34 in the tube version of the circlotron right? this is such a dangerous discovery Quote
JoaMat Posted March 6, 2016 Report Posted March 6, 2016 (edited) Have listen to the DHT carbon style for three weeks now. It’s bloody good – think I like it more than the T2. Below is a draft of how a smd version of DHT might look. Edited March 7, 2016 by JoaMat 5 Quote
Kerry Posted March 8, 2016 Report Posted March 8, 2016 I love what you bring to this sport! Nice job Joachim Quote
JoaMat Posted March 11, 2016 Report Posted March 11, 2016 Pick a lead. Ordered transformers for DHT filament. Not sure the brain was involved. 2 Quote
JoaMat Posted April 14, 2016 Report Posted April 14, 2016 Left channel is a GG. Followed Kevin’s schematic. Intention is to use Emission Labs DHT, didn’t dare to test it with DHT so it’s populated with some modern less expensive EL34. Right channel is an old Blue Hawaii. The combination of BH and GG works terrific. 6 Quote
joehpj Posted April 15, 2016 Report Posted April 15, 2016 Is there any problem with that schematic? @congo5 reported KG's version won't work. Quote
congo5 Posted April 15, 2016 Report Posted April 15, 2016 (edited) I haven't got it to work right, can't be much, a part choice of mine? or something really simple.. I occasionally do real stupid stuff and don't see it. so far 3 boards and same result, low bandwidth (under 1khz) Will revisit after finishing some other projects... (June?) Had two resistors wrong......... Now it works Edited July 4, 2016 by congo5 Quote
JoaMat Posted April 15, 2016 Report Posted April 15, 2016 (edited) As I posted earlier I rebuilt a Blue Hawaii to GG. And now this new one. I can only say that Kevin’s GG works very well. I’ve the opto servo on the board, didn’t flip (or, did flipped it, depends on ones perspective) the opto coupler when mowing it to the other side of board. After correcting the connections to opto coupler the servo still doesn’t work. Have to find the reason for failure. The opto servo should work, shouldn’t it? Edited April 15, 2016 by JoaMat Quote
JoaMat Posted April 15, 2016 Report Posted April 15, 2016 (edited) While speaking servos. The small board between tubes on Blue Hawaii (right channel) is a servo a la T2 (picture a few posts up). Did built it after Kerry suggested that one maybe should do it simple when we tried different servos some year ago. That servo works great. Edited April 15, 2016 by JoaMat Quote
JoaMat Posted April 15, 2016 Report Posted April 15, 2016 Regarding the opto servo. Eventually I spotted the fault. Transistor mounted the wrong way. Now servo working and it works very nice. Really like the opto coupler. Many thanks Kevin. Quote
Kerry Posted April 15, 2016 Report Posted April 15, 2016 Nice. I want to squeeze this project in next. Glad you got the servo working Quote
joehpj Posted April 27, 2016 Report Posted April 27, 2016 For the 4 tubes, is there really benefit to go unregulated PS or even regulated PS? Because I wanted to do two-box design and buckle the heater wire with others to use a single connector. I suspect AC 60hz noise will affect others. Heater for el34 needs 6.3V/1.5A each. So I will aim for about 10A for the PS. Also, the heaters are sitting at -450V, so the PS should be floated? I wanted to go tiny and simple. For single regulator, I could only find MIC29712WT, which is only 7.5A max. Quote
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