Preamp for Dynaco ST-70 Clone
- Thread starter slovell
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Finjima
Well-Known Member
Well go check out tubes4hifi for their pre-amp kits or ones finished, they should match up with what you have. btw what do you have? clone could mean just about anything that has nothing to do with the original dynaco. they have a variety of offerings to match your budget plus they now have remotes!
shelly_d
Not An Audiophool
Assuming that your clone has the same input impedance of the original, 470K, then it is high enough to mate up with any high quality preamp. Depending upon budget I would be looking at Eico, Scott, Fisher, Dynaco (I used their PAT5 for decades before going to McIntosh, and yes I had it mated to a Stereo 70).
Really any quality preamp, tube or SS will work with it.
Good luck.
Shelly_D
Really any quality preamp, tube or SS will work with it.
Good luck.
Shelly_D
shelly_d
Not An Audiophool
On the plus side - Remote control, very low noise and distortion, very wide bandwidth, low output impedance. Should sound very fine for line level inputs. (Have not heard it myself but from the specs - and yes they do mean something- it will sound fine.) On the down side, no phono preamp - don't know if that is important to you, no tone controls (similar to a DIY Aikido in that respect) and no tape out/in.
If you don't need the phono preamp or the tape loop then there is no reason not to give it a go if you can get a good deal on it. If you don't like it you can sell it for little loss if the deal is a good one.
Shelly_D
If you don't need the phono preamp or the tape loop then there is no reason not to give it a go if you can get a good deal on it. If you don't like it you can sell it for little loss if the deal is a good one.
Shelly_D
PakProtector
AK member
An St.70 does not need much gain. You *CAN* build one yourself. A 12B4A, running on about 250V of B+, with DC heaters thanks to a Mouser-sourced wall wart is pretty simple. Plate load around 5-7kOhms, and a 2-3 uF output cap will quite handily embarrass anything at a few times your budget. With excellent parts, a $300 parts bill( with free education on the process )will have you up and running...
cheers,
Douglas
cheers,
Douglas
biscuithead
Me likes the eargasm retroplasm...
Perhaps I'm being simple... but I've used one of these:
http://www.ebay.com/itm/12AX7-Vacuu...908e562&pid=100005&rk=6&rkt=6&sd=251696404186
For about a year with my ST-70. All I run is a CD-player on it... it sounds great for a 200 dollar bill.
http://www.ebay.com/itm/12AX7-Vacuu...908e562&pid=100005&rk=6&rkt=6&sd=251696404186
For about a year with my ST-70. All I run is a CD-player on it... it sounds great for a 200 dollar bill.
ferninando
Lunatic Member
I'v run mine on HK Cit 11 SS, dynaco PAS2, Eico HF85 rebuilt.
All sounded outstanding to me.
No pre at all is also an option. Passive preamp from your CDP.
Any and all above works for me.
Depends on you tastes and passion for better sound quality.
My vote is 1) HK, 2) eico, 3) passive, 4) PAS
All sounded outstanding to me.
No pre at all is also an option. Passive preamp from your CDP.
Any and all above works for me.
Depends on you tastes and passion for better sound quality.
My vote is 1) HK, 2) eico, 3) passive, 4) PAS
Last edited:
whoaru99
Epic Member
I use one of these when I want an all-tube setup with my quasi ST-70.
http://www.transcendentsound.com/Transcendent_Sound_Grounded_Grid_Preamp.html
http://www.transcendentsound.com/Transcendent_Sound_Grounded_Grid_Preamp.html
It sounds a little different but here it goes. For almost two years I used a Marantz 2230 vintage receiver as a preamp with my ST-70.. It sound surprisingly good and matched quite well. As well as having a better than average phono section it looks really cool.
They are fairly cheap and easy to find. They are in need a a recapping but it's easy and fun to do.
They are fairly cheap and easy to find. They are in need a a recapping but it's easy and fun to do.
slovell
Well-Known Member
Don't need a phono input, I already have the Jolida JD9. I'm going to hook up my JD9 and my Jolida CD100 cdp to it to give myself a stand alone two channel system. I've already got several sets of 12AX7's and 5751's on hand so that's a plus. I would like to have tone controls but I can live without them, in reality I usually run my Marantz AV7005 in bypass for stereo. I don't play tape at all. I ordered the JD5t yesterday and should have it in a week or so.
ferninando
Lunatic Member
so are you no longer in need of a preamp? the jd5 will fill the bill for you?
the st70 is a great amp, imo, and is capable of running most any decent preamp.
hope you like the setup.
the st70 is a great amp, imo, and is capable of running most any decent preamp.
hope you like the setup.
slovell
Well-Known Member
We shall see.
Lavane
Lunatic Member
I have a Marantz 1060 Inegrated amp, the same as a 2230 without the tuner. One of my all time favorite Marantz units, even if it is cap coupled. I use the preamp section all the time to connect to different tube and SS amps. It really does sound very nice. And as you stated the phono board is nice also, as long as you leave the original "fat brown" film caps onthe board.
Yeah, I was QUITE surprised at how well it worked as a preamp for tube gear. Like I said I used it for around two years until I sold off the ST-70. Funny how life is. I now own another ST-70 and will NEVER sell this one.
Lavane
Lunatic Member
After recapping and replacing known parts that dont age well it sounded so nice I bought another one that was a literal basket case in pieces. When I was done with it I gave it to my son along with a second model 140 power amp. He is very happy with the combo. The 1060 and the ST70 are keepers!
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