musiclover Posted September 14, 2007 Share Posted September 14, 2007 Just purchased Juicy Music Peach from fellow forum member and sounds great with my Dynaco ST 70. I've had the ST 70 about 7 years. How can I tell if it has had any upgrades or not? It looks like has original transformers. I am using the following tubes: Mullard EL 34's NOS, 2 EF 86 Bugle Boys, 1 Mullard 12AU7 and Mullard Rectifer. On the board where the EF 86 and 12AU7 go, it has 6 black (i guess capacitors) which have on them 630V, MKP-FC, France 95. I didn/t look underneath. I want to get the best performance I can from the ST70 with the Peach. I am pretty content with sound now, but always open to suggestions for even better sound. I also have 1985 K-horns. Any comments or suggestions will be appreciated. David. Quote Link to comment Share on other sites More sharing options...
DoubleJ Posted September 14, 2007 Share Posted September 14, 2007 Hi: Congrats on the Peach purchase!! In regards to the ST 70, I would take a few pictures of the unit, inside and out, and make sure to get a good clear picture of the wiring and post it on the forum. Craig (NOS Valves) and others will be able to give you a pretty good answer on what mods, if any, have been done. JJ Quote Link to comment Share on other sites More sharing options...
NOSValves Posted September 14, 2007 Share Posted September 14, 2007 If it uses EF86 and12AU7 tubes in the front end it has been at least partially upgraded those are not tubes used in the original Dynaco ST70 circuit. Quote Link to comment Share on other sites More sharing options...
mas Posted September 14, 2007 Share Posted September 14, 2007 Hey Craig, welcome back. Too long no see... Quote Link to comment Share on other sites More sharing options...
musiclover Posted September 14, 2007 Author Share Posted September 14, 2007 Is this one of the major upgrades or are they other that might improve performance even more. What do I look for underneath to know of any upgrades? I would send pic, but don/t have digital camera. Thanks. David Quote Link to comment Share on other sites More sharing options...
Woodog Posted September 14, 2007 Share Posted September 14, 2007 Is this one of the major upgrades or are they other that might improve performance even more. What do I look for underneath to know of any upgrades? I would send pic, but don/t have digital camera. Thanks. David DUDE! You have a PEACH! And you didn't tell me. [:'(] OK, now I'm JEALOUS!! you should send that ST-70 to Nosvalves for a 'tune-up'. You would be glad you did. Really. really! woo p.s. I'm very willing to spend other people's money. Quote Link to comment Share on other sites More sharing options...
joshnich Posted September 14, 2007 Share Posted September 14, 2007 Ill echo what has been said. Have Craig take a look at your ST 70 and he will give you an honest and informed opinion on what you could and should do to make turn your ST 70 into a giant killer. His work is top notch and his pricing is more than fair. Josh Quote Link to comment Share on other sites More sharing options...
musiclover Posted September 14, 2007 Author Share Posted September 14, 2007 Sorry, not had it very long. They are nice. Holler at me when you are over this way. I/ve been reading on here should replace caps on k-horns after 20 yrs. Mine are 1985, but still sound fine to these ears. You ever replaced yours? Think my crossovers are Ak-2. Looks kinda complicated to me. David. PS. Don/t tell Jane bout the Peach, as kinda snook it in, lol. She would think i/m insane, lol. David. Quote Link to comment Share on other sites More sharing options...
Woodog Posted September 14, 2007 Share Posted September 14, 2007 Sorry, not had it very long. They are nice. Holler at me when you are over this way. I/ve been reading on here should replace caps on k-horns after 20 yrs. Mine are 1985, but still sound fine to these ears. You ever replaced yours? Think my crossovers are Ak-2. Looks kinda complicated to me. David. PS. Don/t tell Jane bout the Peach, as kinda snook it in, lol. She would think i/m insane, lol. David. mum's the word. About crossovers... I have ALK crossovers in my khorns, and buddy goodness yes, they made a HUGE difference. On a pair of my Cornwalls that I took down to Hope, AR in September 2005, Daddy Dee's Heresys had MUCH better sound. I purchased a pair of Bob Crites Crossovers, (type and had them put in on the spot... WOW... what a HUGE difference in the sound. Like you, I thought they sounded just fine until I heard the difference. I recently let BS Button, who lives in Bowling Green, use my Khorn ALK crossovers and I put the stock, 30 year old AA's back in them while he listened to the ALK's on his La Scalas. It was almost like putting a curtain in front of the speaker. I'm pretty sold on the ALK's, but you have to drop some coins for them. I got mine used for $400 (I think). The standard rebuild is way less. I tell ya what... I'll bring my crossovers over next time I visit and we'll hook 'em up. See what you think. While you might not want to buy a set, they'll definitely let you know what a crossover rebuild will lead towards. Somebody here'll pipe up if the ALK (standard ALK) won't work for your horns, but I think they will. woo Quote Link to comment Share on other sites More sharing options...
The Voodoo Doctor Posted September 14, 2007 Share Posted September 14, 2007 For the ST-70, the schematic (with EF86's) can be found on the Triode Electronics website. See link below. http://www.triodeel.com/dyna1.gif http://store.triodestore.com/dynacoupgrades.html They also have a decent amount of information amount Dynaco ST 70's and possible upgrades to the amp. So if you are a "do-it-yourself'er" this is a good place to look for additional information and popular upgrades. CSB Quote Link to comment Share on other sites More sharing options...
Professor Thump Posted September 14, 2007 Share Posted September 14, 2007 For the ST-70, the schematic (with EF86's) can be found on the Triode Electronics website. See link below. http://www.triodeel.com/dyna1.gif http://store.triodestore.com/dynacoupgrades.html They also have a decent amount of information amount Dynaco ST 70's and possible upgrades to the amp. So if you are a "do-it-yourself'er" this is a good place to look for additional information and popular upgrades. CSB Good to have the Doctor in the house! [D] You wouldn't happen to have that fancy new guitar tube amp finished yet would you? Indy guitar show is coming up and ya gotta show your wares... Stick that mutha thumpa in your EAR! Quote Link to comment Share on other sites More sharing options...
cjgeraci Posted September 14, 2007 Share Posted September 14, 2007 Sorry, not had it very long. They are nice. Holler at me when you are over this way. I/ve been reading on here should replace caps on k-horns after 20 yrs. Mine are 1985, but still sound fine to these ears. You ever replaced yours? Think my crossovers are Ak-2. Looks kinda complicated to me. David. PS. Don/t tell Jane bout the Peach, as kinda snook it in, lol. She would think i/m insane, lol. David. mum's the word. About crossovers... I have ALK crossovers in my khorns, and buddy goodness yes, they made a HUGE difference. On a pair of my Cornwalls that I took down to Hope, AR in September 2005, Daddy Dee's Heresys had MUCH better sound. I purchased a pair of Bob Crites Crossovers, (type and had them put in on the spot... WOW... what a HUGE difference in the sound. Like you, I thought they sounded just fine until I heard the difference. I recently let BS Button, who lives in Bowling Green, use my Khorn ALK crossovers and I put the stock, 30 year old AA's back in them while he listened to the ALK's on his La Scalas. It was almost like putting a curtain in front of the speaker. I'm pretty sold on the ALK's, but you have to drop some coins for them. I got mine used for $400 (I think). The standard rebuild is way less. I tell ya what... I'll bring my crossovers over next time I visit and we'll hook 'em up. See what you think. While you might not want to buy a set, they'll definitely let you know what a crossover rebuild will lead towards. Somebody here'll pipe up if the ALK (standard ALK) won't work for your horns, but I think they will. woo Oh, fooey, don't let the new (and latest) skeptics in the forum stifle your well informed opinions regarding crossovers. I tried a variety of crossovers, including rebuilt OEMs - and ended up with ALK's extreme slope/gentle slope in the front (Khorns) and the ALK universals in the rear (Belles). Major difference for me, and no turning back. But.........to each their own. Congrats on the ST70 and Peach. I can honestly say that my Peach is the one piece of gear that will never leave my system. Carl. Quote Link to comment Share on other sites More sharing options...
musiclover Posted September 17, 2007 Author Share Posted September 17, 2007 How would you hook them up? Looks like mine are soldered in. Quote Link to comment Share on other sites More sharing options...
Woodog Posted September 18, 2007 Share Posted September 18, 2007 Next time I'm over I'll bring one of mine. It attaches pretty easily. Woo Quote Link to comment Share on other sites More sharing options...
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