NOSValves Posted October 28, 2004 Share Posted October 28, 2004 My latest Dynaco ST70 modification package. I've been meaning to get to this project for 3 months on my own amp. But Scott's amps made to the Queue first. This setup really sounds great and is defenitly a step up from the Curcio Board I had been using and I haven't even tweaked it yet! I'm pretty excited about this and will be designing a Stereo amp losely based of this setup. I think anyone that buy's a Cayin or Jolida for $800 to $1K is really cutting themself short this amp will blow them away in all respects for even or less money depending on what they pay for the ST70. What do you all think of the modification to the front panel ? I should of taken some before pictures this amp was a real rats nest. Power supply now has 458uF compared to the original anemic 90uF !! Uses 3 - 12AT7's but also can be used with 12AU7 or 12AX7 for a different flavor! Full bias control and AC Balance built into the Front End board. Spread out the RCA jacks for more interconnect room and gold RCA input Jack. Got rid of the ugly tube sockets and Mono/Stereo switch and mounted Bias Test points and a ground jack in there place. Link to comment Share on other sites More sharing options...
dodger Posted October 28, 2004 Share Posted October 28, 2004 There are many mod kits for the ST-70. However, Craig has probably tried them listened to them and evaluated them. He has also probably tried them with Klipsch. Now he has a kit that takes a number of factors into account that others may not have. If someone owns Klipsch and has an ST-70 that they are considering modifying, this would be the way to go. dodger Link to comment Share on other sites More sharing options...
Guest Anonymous Posted October 28, 2004 Share Posted October 28, 2004 Craig, Betcha they sound betta than they look, huh Keep playing, have fun, and rock on baby Link to comment Share on other sites More sharing options...
garymd Posted October 28, 2004 Share Posted October 28, 2004 Hey Craig, More than coincidence?????? Link to comment Share on other sites More sharing options...
NOSValves Posted October 28, 2004 Author Share Posted October 28, 2004 Slight clarification. I do not sell kits ! Never will I don't have the time to give proper support for DIY market. I do give free advise often though as time permits. Craig Link to comment Share on other sites More sharing options...
NOSValves Posted October 28, 2004 Author Share Posted October 28, 2004 ---------------- On 10/28/2004 1:03:05 PM garymd wrote: Hey Craig, More than coincidence?????? ---------------- You lost me what do you mean ? Craig PS gotta LOL !!! Link to comment Share on other sites More sharing options...
powdermnky007 Posted October 28, 2004 Share Posted October 28, 2004 I have an st-70 that craig modded (with the cuccio board), I'm waiting for my good cd player to come in (a dec-685). I've been using a pawn shop sony cd player in the mean time I know the source & speakers make the biggest difference, but his st-70 is top notch! Link to comment Share on other sites More sharing options...
dbflash Posted October 28, 2004 Share Posted October 28, 2004 Craig, Nice. If anyone has a ST70 and has been thinking about upgrading I would let Craig do it. Craig does great work and also stands behind his work. Danny Link to comment Share on other sites More sharing options...
Deang Posted October 28, 2004 Share Posted October 28, 2004 "Craig does great work and also stands behind his work." He would probably do better work if he stood in front of it instead of behind it. Link to comment Share on other sites More sharing options...
Guy Landau Posted October 28, 2004 Share Posted October 28, 2004 Nice board. Can it accept 6CG7s? Link to comment Share on other sites More sharing options...
NOSValves Posted October 28, 2004 Author Share Posted October 28, 2004 ---------------- On 10/28/2004 4:16:30 PM Guy Landau wrote: Nice board. Can it accept 6CG7s? ---------------- Nope why are you so stuck on that tube ? Craig Link to comment Share on other sites More sharing options...
mike stehr Posted October 28, 2004 Share Posted October 28, 2004 6SN7 in a mini-bottle Link to comment Share on other sites More sharing options...
scott0527 Posted October 28, 2004 Share Posted October 28, 2004 ---------------- On 10/28/2004 12:58:51 PM smilin wrote: Craig, Betcha they sound betta than they look, huh Keep playing, have fun, and rock on baby ---------------- Hey now! Be nice to my little Dyna. Link to comment Share on other sites More sharing options...
thebes Posted October 28, 2004 Share Posted October 28, 2004 Very cool work Craig. You've really got the touch for this stuff. You mentioned Jolida but how do they stack up to the Scott 299's and say your VRD or are these animals of a different sort? Link to comment Share on other sites More sharing options...
scott0527 Posted October 28, 2004 Share Posted October 28, 2004 Craig that thing looks sweet! I'm not sure about rats but there where definitely a ton of spiders making a nice home out the inside of my little Dyna girl when I picked her up. Have fun tweaking. Link to comment Share on other sites More sharing options...
Guy Landau Posted October 28, 2004 Share Posted October 28, 2004 ---------------- On 10/28/2004 4:26:34 PM NOSValves wrote: ---------------- On 10/28/2004 4:16:30 PM Guy Landau wrote: Nice board. Can it accept 6CG7s?---------------- Nope why are you so stuck on that tube ? Craig ---------------- ---------------- On 10/28/2004 4:28:51 PM mike stehr wrote: 6SN7 in a mini-bottle---------------- Exactly. And it's one of the best phase splitters around. Link to comment Share on other sites More sharing options...
scotbuck Posted October 28, 2004 Share Posted October 28, 2004 Greetings, For whatever this may (or may not) be worth... A tech who's worked on my guitar amps for years said that a 12AU7 really shouldn't be used as a substitute for the twin triode 12AX7/12AT7/12AY7/5751 tubes. He said that the 12AU7 draws current/voltage differently (I forget which) and this can cause problems. This was borne out in an old amp I had that kept blowing the Sovtek 12AX7 that had been put the V1 position. When my tech examined the circuit he determined from the current/voltage being drawn that the V1 position should have been a 12AU7 tube. Putting a 12AU7 in the socket solved the problem and the amp was stable. Hope this is helpful... Take care, Scott Link to comment Share on other sites More sharing options...
cjgeraci Posted October 28, 2004 Share Posted October 28, 2004 Craig: If you have a second, shoot me a quick PM. I would be curious to know what your rebuild runs on the Stereo 70. In a month or so, I am going to be running one with one of my two-channel systems, and I anticipate sending it to you down the road for a good reworking. Thanks. Carl. Link to comment Share on other sites More sharing options...
Marvel Posted October 28, 2004 Share Posted October 28, 2004 Yo Craig, Is that the st-70 board from Roy at Tubes4hifi? Looks pretty slick installed. How much wider is that board under the chassis than the stock ST-70 board? Marvel Link to comment Share on other sites More sharing options...
RIklipsch Posted October 28, 2004 Share Posted October 28, 2004 Craig, Did you try replacing the Xicon electrolytics in the front-end with something better? How about the metal film resistors? Perhaps there is no improvement to be gained here, and is why you left those intact? Room on the board itself probably poses a problem when using other types. Just curious, particularly after seeing the higher grade "sonicaps" installed in your unit. Board is very nice, as are the PS mods. Ryan Link to comment Share on other sites More sharing options...
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