February 18, 201610 yr It is an interesting comparison if only to see how great the triode strapped EL34 is.
February 18, 201610 yr Author 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...
February 18, 201610 yr You will be put in charge of the plugs when the mafia starts to make headphones...
February 19, 201610 yr 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.
February 19, 201610 yr I can get them cheaply. Let me know if you need. They are something like these: Edited February 19, 201610 yr by chinsettawong
February 19, 201610 yr Nice connectors. I really like the color of the male. Help appreciated. PM sent.
February 19, 201610 yr 18 hours ago, kevin gilmore said: seriously, ray has turned into a real sleezeball... How do you tell? Edited February 19, 201610 yr by guzziguy
February 20, 201610 yr 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?
February 20, 201610 yr 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.
February 20, 201610 yr Sold rk50. Got money enough for tubes, bottle of single malt and flower to wife.
February 20, 201610 yr 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
February 20, 201610 yr 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
March 6, 201610 yr 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, 201610 yr by JoaMat
March 11, 201610 yr Pick a lead. Ordered transformers for DHT filament. Not sure the brain was involved.
April 14, 201610 yr 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.
April 15, 201610 yr Is there any problem with that schematic? @congo5 reported KG's version won't work.
April 15, 201610 yr 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, 20169 yr by congo5
April 15, 201610 yr 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, 201610 yr by JoaMat
April 15, 201610 yr 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, 201610 yr by JoaMat
April 15, 201610 yr 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.
April 27, 201610 yr 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.
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