*Who loves their Dynaco ST70?!* Contact Miller Audio For Finished Amplifiers (not on website yet): info@milleraudiollc.com Miller Audio Upgrade Kit (auto bias): milleraudiollc.com/product/dyna-70-ultimate-upgrade-kit-w-automatic-bias-module/ Miller Audio Upgrade Kit (manual bias): milleraudiollc.com/product/dyna-70-ultimate-upgrade-kit-manual-bias/ best vintage amplifier binding post adaptor: milleraudiollc.com/new-components/ Related Videos: Original Dynaco ST70: kzbin.info/www/bejne/rJiyf6V3jdOSqdU Borresen X2 Speaker Review: kzbin.info/www/bejne/a33FmJh9atKci5o Support on Patreon: www.patreon.com/jayiyagi follow on Instagram: instagram.com/jays_iyagi/ follow on Facebook: facebook.com/jayiyagiofficial Follow soundstage take 2 reviews: kzbin.info/aero/PLPOzvlhtSqn5xdc__ftuSt4Rxy_wm5Af0 Speaker stands: amzn.to/3ssRhI3 Better speaker stands: solidsteel.it/my-product/ss-7-vintage-hi-fi-speaker-stands/ acoustic panels I use: ua-acoustics.com/ acoustic curtain: amzn.to/31d1zAM BDI Cabinet I use: bit.ly/2OJRwQQ amzn.to/3chBuFZ other BDI Cabinets: bit.ly/3ctxXV1 amzn.to/30bsUCH my fav hifi tweaks: (Isoacoustics devices) amzn.to/3j5FGvM 0:00 RECAP on Dynaco ST70 1:47 Dynaco ST70 Upgrade: Miller Audio 6:13 Dynaco ST70 Upgrade Sound Review 10:12 HOW MUCH POWER? 12:03 WHAT'S THE PRICE? 12:35 BEST Vintage Amplifier Binding Post Adaptor!
@tonys.38239 ай бұрын
Great review Jay! I have one of these upgraded amps and I can truthfully say it is the best sounding amp I own. I know Bryan personally and think he is a brilliant engineer, no bias intented (excuse the pun). First, by responding to a local add for a restored Fisher X100, then picking up some monoblock W4s, Maggies, Dynaco MK3, etc... His ST70 is in a league of its own. I've heard and seen the progression of this upgrade and it is truly a remarkable amp. Your review is spot on in my opinion, that it retains the tube amp magic while having an accurate bass response, power and authority by the improved rectifier circuit. The amp is super quiet too and stable. He showed me on a distortion analyzer they operate something in the low hundreths of a percent and other improvements to lower the noise floor. For me, it is the best of hifi. A tube amp where important and SS in critical places outside the signal path, check out all those filter caps! The preamp section is improved. I prefer the 6sn7 as opposed to the smaller driver tubes.
@briancampbell77125 ай бұрын
😂
@marksmusicobsession10 ай бұрын
Tube rectification is one of the many reasons I love my McIntosh MC60’s
@DougMen110 ай бұрын
The most iconic stereo amp ever, designed and built by the man that invented Ultralinear tube topology, David Hafler.
@carlostmartinez769310 ай бұрын
Exactly what I said to Bryan Miller. It maintains that middle frequency “Magic”, with better bass control and extension. The soundstage is better exhibited! It’s all about the music!
@OddAudioCanada10 ай бұрын
The main difference between SS and tube rectification is you can run way more filter capacitance with SS - with a tube reg, you are limited to a modest value due to the inrush current and need chokes (inductors) to smooth things out. Modest = 20-60uf for the first cap depending on the tube - that ain't much! Too much inrush when the caps fill and it will kill the tube. Plus there's a limit to how much current can pass through the tube so it can limit the potential power. So for best results SS then a bunch of capacitance to get a stout power supply. If you design around SS from the start you have next to no voltage drop and can run higher B+ voltage for a little more power (the drop in SS cans have a built in voltage drop to match the voltage of the tube they replace). If the Miller Autobias is based on the AB-Q modules (which it appears to be) it's a great system, I've used them in my homebrew designs. Set and forget and built in warmup mute.
@christianbolt576110 ай бұрын
I have the Dynaco MK III monoblocks and upgraded all the components. Still may make more upgrades. Love the sound, made me fall in love with tubes. Don’t need more power as I have VTL 450s for that
@BobBasshead6 күн бұрын
I remember the day when you could buy these brand new, kit or assembled. I chose the ST120, PAT4 and the FM5 in kit form. Had I known this I would have bought their tube amps. As they say hindsight is 20/20.
@peterlundskow406110 ай бұрын
I have an updated one but not Miller version, thanks for the video!
@JC-ig4xy5 ай бұрын
Is it the tubes4hifi upgrade? How does it sound?
@psyphonyxaudio10 ай бұрын
Awesome! - I've been interested in doing some DIY stuff for a while. Orchard Audio was one of the first that I recall offering kits .. but this one .. This seems special. Great video also .. " Kidney? " haha.. Got me on that one. =)
@mikewolfe945810 ай бұрын
Nice! Thanks for the review. I’ll be at the audio fest, so I’ll make sure to check these out.
@libertyss3210 ай бұрын
Great video Jay🤙🏼
@stinkenstine2 ай бұрын
I went with a totl Kenny Russell version. All new components using the original David H. Circuit. All caps are as good if not better than McIntosh. He lets you choose. Blows all of the other’s out of the water!
@WigandKleine10 ай бұрын
Hi Jay; I saw the MP-DX on your stack; do you plan reviewing it? Would be nice
@tweakerman10 ай бұрын
Great video & spec jay👍
@terryhu5710 ай бұрын
I have the Vincent SV500 with my Tekton Lores. It’s a modern 50 watt class a/b with a tube preamplifier. Unbelievable
@navoo900910 ай бұрын
Yamaha R-N800A 👈👍
@Rooooarzzz10 ай бұрын
What about the Nat Transmitter tube amp we see on the video, are you going to do a review on those ? This would be interesting
@jankilly35168 ай бұрын
I have a Bob Latino redesigned ST-70 driving Quad ESL-57. OMG !!! In heaven. An excellent first tube amp w/o breaking budget. “OTL” amps are supposed to be the cat’s meow, but $$$$
@JC.LC.10 ай бұрын
Solid state rectifier is the way to go. More slam less sag....
@fletchermunson622510 ай бұрын
Early in my audio hobby I was lucky enough to come across a pair of upgraded Dynamo MkIII mono tube amplifiers. They were amazing but like a fool I let them go and have never seen a pair again. Big mistake!
@Dinolobe37610 ай бұрын
Are you preparing a video about these white tekton lores ? I have a pair of these with the upgrade package in the same colour but without the grilles
@DougMen110 ай бұрын
There are still to this day very few transformers that can match the Acrosound and Dynaco transformers designed by David Hafler and his partner Herb Keroes. They are legendary.
@Alan_Always9 ай бұрын
Jay - my question is how does the Miller sound against the "get dynco" or the Bob Latino "tubes4hifi" upgraded versions of the ST-70? All three companies sell these upgraded clones but aside from the rectifier debate, I'm not sure what the differences are. I'm interested in buying/trying one of them but it's hard to make a decision of which one as they all get glowing reviews.
@fashyontime10 ай бұрын
Hello Jay, love your reviews. Have you heard about the new triangle borea br10
@c34webb10 ай бұрын
Do you think the new amp will drive the Sabrina’s?
@marcparsons172610 ай бұрын
Try a Yaquin tube amp. Under the radar gem.
@Jayiyagi10 ай бұрын
Tried Yaquin amp long time ago. It was just OK. Maybe it’s better now
@carminecupani231510 ай бұрын
The best st-70 is stock. Use a 6gh8a or 6u8a with an adapter. As log as you renew the capacitors Audio and Ps. David Hafler was a great engineer. The limiting factor were parts. Audio Research did an extensive redesign years ago and it was good. But yet the stock unit was better in my opinion.
@Jayiyagi10 ай бұрын
Have you heard the Miller audio upgraded ST70 though?
@frankgeeraerts624310 ай бұрын
I do agree with you !..............these modifications are different circuits and NO longer a ST70 .......When modified I don't call it a ST70 ...........this Miller is full triode and no Haffler circuit ( penthode/triode ).
@carminecupani231510 ай бұрын
@@Jayiyagi I haven’t. But I have been restoring and modifying for 50 years. There are numerous replacement boards that use multiple tubes. I have customers that insist on changing the design. The results I saw over the years was mixed. This might be great I don’t know. And it’s all subjective anyway. From a design standpoint the stock ST~70 is a very good one. I have serviced and owned many of these. Go my self I use a Radford STA 15. It’s reall the only amp drives the Quad 57 almost perfectly. It also uses a pentode gain stage. But the overall design was really in a class by itself. It uses a gz34 rectifier as well. The STA25 got rid of the rectifier and used a ss rectifier. It wasn’t as good in my opinion. ARC used and still uses ss rectifiers in most. Requires a thermistor in the ac side at least. Radord they needed one in the b+ supply to delay the voltage until tubes are warm. There ways around this. David bernings EA -230 uses ss rectifier. The 6sn7 grids needed protection diodes because there was no delay on the b+ application. It’s just different. See if you try this on a set of quad 57s. If it drives then it will drive anything. The load varies from 32 ohm down to 2 ohms across the audio band. The stock St 70 was good but tended to ring a bit on square waves causing brightness. But other wise good. The EA 230 was better. But the Radford is the best. Even beats the quad II. It’s all subjective of course. Thank you.
@cocko4010 ай бұрын
You are 100% correct. All of the “modders” trying to make it better only succeed in making it sound less musical. The ST70 was an excellent amp. Just replace parts that have worn out over time with proper replacements and enjoy the glow!
@johnboard77709 ай бұрын
Jay, do you get any increase in WPC if you use these as monoblocks?
@francoisroberge588210 ай бұрын
If you're going to exchange a GZ34 tube for a WZ34 Copper Cap it would be wise to get a slow start if you don't want to fry the EL34s. SS does not warm up.
@cruise20235 ай бұрын
Check out GR Research, Danny's take on the ST70 and his tweek, adding tube connectors which elevates the top end, yep you heard right his legend tube connectors.
@Mikexception10 ай бұрын
If we want to understand why everywhere solid state replaced in design tube type rectifiers it would be educating to compare the effort to assemble tube with socket in chassis to alow easy tube replacement and connections and dedicattion of more space and more chassis surface in compare to solid state bridge. Are there any downsides of solid rectifiers? I think I saw some overheated, in case of overload bridge may break and needs to be replaced by qualified service On one side price of bridge is many times lower than tube on other tube would not damage in part of second
@stringaudio8410 ай бұрын
Better call this redesign.
@yanluisbergareche940710 ай бұрын
TAD La34 ?
@Peter-ii4xq10 ай бұрын
I have restaurated mono blocks. 70 Watt each. Great sound but they are for sale.
@georgelenz75944 ай бұрын
Add some ISO/Tango output transformers to this amplifier on a rebuild and now you are talking.
@CohibaJoe10 ай бұрын
Jay, It’s a Different product. It’s like a McIntosh MC275 point-to-point wired amp from the 60’s is replaced with all circuit boards…Oh, this happened in the 90’s yet the McIntosh MC275 (point-to-point) is the mored desired amp.
@michaelmityok100110 ай бұрын
Is this ST70 a SET amp or push pull?
@Jayiyagi10 ай бұрын
Push pull
@frankgeeraerts624310 ай бұрын
Indeed a PP design .........SE amplifiers work exclusively in full class A.......
@jdm-uk-yank10 ай бұрын
I actually own the BEST tube integrated amp ever made. The Audio Matiere Majuscule. It runs triode and pentode simultaneously. This gives all the magic of tube with tight bass
@longshanks825510 ай бұрын
Any reliability issues? I passed on one some yrs ago because of an unhappy owner.
@MrBonger8810 ай бұрын
Jay you should try out one of the prebuilt Elekit integrated amps out of Japan. I’ve never had a 300b with so much bass/punch. Only upgrade was the small 12v tubes
@salmanalfarisiaudio10 ай бұрын
👍👍🇮🇩
@kelvinjinxd6 ай бұрын
I don’t like the way you talked about the sound without any measurements. I don’t think the 3-tube preamp board is any better than the original one. The “good” base you mentioned may be the result of high distortion at base frequency after you “upgrade”.
@JasonD-yc3oy10 ай бұрын
Boyuurange MT 34 MKII "brand new" would be so much better for the same amount of money
@thomasfi127510 ай бұрын
With all the upgrades this a totally different amplifier and has nothing in common with the original. Nearly all parts has been changed.
@jdm-uk-yank10 ай бұрын
I'm number 1🎉
@ivansbacon10 ай бұрын
I was excited to see this pop up. BUT, i am not putting solid state anything on my ST-70. I agree with other commenters, you can not really call this an ST-70 Design with the changes miller has made. Disingenuous to call it a ST-70
@briancampbell77125 ай бұрын
Jay...those replacment banana posts aren't much better than original...put a pair of decent binding posts on...how much do you get paid for promoting this upgrade kit❓🤣...if it's so good and better...then why don't you throw away your original🤣