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Audio Technica AT-ART9 with Ortofon STM-72 into Parks Budgie?

bloodlemons

bloodlemons

Member
Guys --

I want to pick up an AT AT-ART9 cartridge. I have a Parks Audio Budgie that I currently use with an AT MM cart. For some reason, I also own an Ortofon STM-72 SUT, which I have never used at all.

I have been reading specs and posts all day and am still confused. Does anyone know if I can run the AT-ART9 into the STM-72 and then into the Budgie? If so, how do I choose the load on the Budgie? If not, will they work together into the phono input on my integrated?

Much appreciation for any information or shared experiences. Thank you!
 
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bloodlemons said:
I want to pick up an AT AT-ART9 cartridge. I have a Parks Audio Budgie that I currently use with an AT MM cart. For some reason, I also own an Ortofon STM-72 SUT, which I have never used at all.

I have been reading specs and posts all day and am still confused. Does anyone know if I can run the AT-ART9 into the STM-72 and then into the Budgie? If so, how do I choose the load on the Budgie? If not, will they work together into the phono input on my integrated?
Click to expand...

The internet says the Ortofon STM-72 has a setup ratio of 1:60, and an input impedance of only 15 ohms. If this is correct, then it's not what you need for an ART9.

jeff
 
The STM-72 is designed for a cartridge output of 70 micro volts about 1/3 the output of a LOMC that does 0.2 mV. What is the output of the AT, somewhere between .2 and .8 mV? Maybe not a great match.
 
Blue Shadow said:
The STM-72 is designed for a cartridge output of 70 micro volts about 1/3 the output of a LOMC that does 0.2 mV. What is the output of the AT, somewhere between .2 and .8 mV? Maybe not a great match.
Click to expand...

The AT is at 0.5 mV. It looks like the SMT-72 still stays on the bench. I was really hoping to avoid buying another SUT, but here we are. Thanks for the thoughts, guys!
 
To be exact: the cart needs to see 10x its internal impedance. The transformer reduces the input impedance of the MM input which is usually 47kOhm by its ratio squared. So 47k:60²~=15 Is not enough. You will get trouble at frequency extremes and lose a LOT of amplification. The formula is a bit more complicated but is linear when Ri>Ra:10
 
Thanks, Jeep!

I am currently mulling over running an AT-ART9 at 0.5mV into a Parks Audio Puffin with EQ off and at 200kOhm and 72db gain into my Budgie. It seems like it should work, but of course I wonder if anyone has any thoughts or experiences with that type of setup... ?
 
If you’re getting a Puffin try fiddling around with it first. In my system the Puffin alone sounded better than a park’s SUT going into the Budgie with Tele tubes.

Surprised the hell out of me but after a few days I sold the Budgie and SUT, and haven’t looked back. :)
 
static14 said:
If you’re getting a Puffin try fiddling around with it first. In my system the Puffin alone sounded better than a park’s SUT going into the Budgie with Tele tubes.

Surprised the hell out of me but after a few days I sold the Budgie and SUT, and haven’t looked back. :)
Click to expand...
Luckily I have a local shop that will let me audition a Puffin. I have already done so once with my moving magnet set up, but decided to go for the Budgie instead. Now that I am looking at moving coils, I am reconsidering my signal path.
 
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