DIY Tube Driver Board

knowledge base for the classic Dynaco ST70

DIY Tube Driver Board

Postby janna » Wed Apr 04, 2012 9:55 am

Hi Shannon,

Can you advice what is the input sensitivity of your driver board?

Thanks!
janna
 
Posts: 5
Joined: Wed Apr 04, 2012 9:46 am

Postby Shannon Parks » Wed Apr 04, 2012 10:13 am

Referencing back to my manual, I see it took 1.06Vrms for 35W output and 1.165Vrms for 42W (1%THD) - so basically 1Vrms.
http://www.diytube.com/st70/diytube_st70_B.pdf

Shannon
User avatar
Shannon Parks
Site Admin
 
Posts: 3764
Joined: Tue Mar 18, 2003 5:40 pm
Location: Poulsbo, Washington

Postby janna » Wed Apr 04, 2012 4:39 pm

Thanks Shannon! :-)

Is it ok to put 100K pot on the input? or better to have an active stage?

separks wrote:Referencing back to my manual, I see it took 1.06Vrms for 35W output and 1.165Vrms for 42W (1%THD) - so basically 1Vrms.
http://www.diytube.com/st70/diytube_st70_B.pdf

Shannon
janna
 
Posts: 5
Joined: Wed Apr 04, 2012 9:46 am

Postby Shannon Parks » Thu Apr 05, 2012 5:50 am

Depending on your source, yes, you can just use a 100K volume pot. CD players will drive it easily. And devices like iPods are usually 1Vrms max output so you should be fine, though your volume pot will be cranked as well as the iPod volume control - but that isn't a problem.

Shannon
User avatar
Shannon Parks
Site Admin
 
Posts: 3764
Joined: Tue Mar 18, 2003 5:40 pm
Location: Poulsbo, Washington

Postby janna » Fri Apr 06, 2012 6:56 pm

Thanks for your inputs! ;)


separks wrote:Depending on your source, yes, you can just use a 100K volume pot. CD players will drive it easily. And devices like iPods are usually 1Vrms max output so you should be fine, though your volume pot will be cranked as well as the iPod volume control - but that isn't a problem.

Shannon
janna
 
Posts: 5
Joined: Wed Apr 04, 2012 9:46 am


Return to st70

Who is online

Users browsing this forum: No registered users and 24 guests