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mdr30

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  1. Finally completed my Dynahi, an on/off project (like some of them) for five years. Bought the set of boards from Samsie in December 2015, so I thought I'd just let him know that they eventually came of use! Turned out to be a relatively uncomplicated build, except for a couple of resistors around the THAT340 with too many zeros, discovered by MLA. Also a problem with the -30V side on one of the PSUs. Turned out to be a malfunctioning rectifier. A BC556 popped, but the supply worked once replaced. For a week or so, then the 556 popped again. After the third time I scratched my head, but some sparks from one of the surrounding caps told me it had taken some beating from the faulty rectifier. Replaced that and the DN2540 and now it has played without incidents for a couple of weeks. Sounds very nice and has become my go-to-amp, with some competition from a KSA5 I took over from MLA recently. Spoiled for choice.
  2. Thanks, two jumpers did the trick. I think I'll lower the gain with 50K/5pF feedback, which I think are the parts at the arrow (don't have a schematic). The PSU is hopefully ok too, did not populate the transistors that popped at turn-on. Time to test the beast.
  3. Am about to test my Dynahi boards but have a little probelm. The holes were to small for the 0,1 uF servo caps so I made them slightly larger wit a drill. Later I realised I may have ruined and inner layer contact (one leg of the caps have no connection on the back of the board). Is there a way to check this, could a jumper fix it?
  4. Had a Keith Monks unipivot quicksilver tone arm 30 years ago, very interesting design. Problem was that the pins oxidised in the quicksilver bath, had to be cleaned regularly. But the design without cables from tone arm to turntable and at the same time damping of the unipivot arm tube in the four quicksilver baths connecting cartridge to riia was quite intriguing.
  5. Wonderful. Listened and appreciated it. Only afterwards did I realise she's from my home country - never heard about her before. Shame on me.
  6. No it's not. Generalised opinions like this should be avoided.
  7. Now isn't that a rare choice. I bought his "Jonas Fjeld Rock and Rolf Band" in the 1970s, on sale at Waidele in Gothenburg. A terrific, original and inspired recording making fun of present trends with a satire twist ("Bridge Over Tonic Water"). A forgotten masterpiece that still excites.
  8. Count me in as well. Fine amp, does its duties alongside Dynalo, M3 and Squarewave (and soon Dynahi). Runs it with Russian gold grid 6N1P tubes.
  9. Thanks. Of course a small homage to the Swedish radio manufacturer 'voice of Scandinavia' (1940s). The vintage knob has the patented double dot feature which guarantees perfect channel balance. On-off switch is a spiffy little Russian thing with nice M1,6 threads. Bought a pair from Bulgaria delivered in oiled paper. Strange thing: manufacturer has the same name as me.
  10. Gonna start Dynahi next, on board heatsinks and double mono in two boxes, and wonder if anyone konows where I can source two SJ109 jfets to go with the SK389s I got.
  11. Does anyone possibly have a couple of sj109 to complement my sk389s?
  12. This is outrageous! I just got a 0,002V shock from my 4xx, an outburst that enhanced dynamics subtly but perceptably. 5th layer stereo depth, black background etc.
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