My take on a modern ST-70

Wardsweb · 20th March 2010, 10:43 AM

Something a little different this time. Take a classic design Dynaco ST-70 and bring it up todate with some circuit changes and better parts. Then, throw in a totally new chassis and cabinet.

The layout begins on some aluminum sheet.

Wardsweb · 20th March 2010, 10:45 AM

I drilled, cut and punched the chassis. Bend the back down for all the inputs and outputs. Then take it over to the local chrome shop for a bright finish.

Wardsweb · 20th March 2010, 10:47 AM

I used Baltic birch to create a new cabinet design. The metal chassis slides in from the back.

Wardsweb · 20th March 2010, 10:49 AM

Here is a picture from the back. The rectangle cutout is for the Corcom power module. The inputs are on the outside edges and the outputs are in the middle.

Wardsweb · 20th March 2010, 10:52 AM

Now a lot of wiring to do. I spend a lot of time working on layout, wire runs and esthetics. It must only sound good, it has to look good too.

Loren42 · 20th March 2010, 11:17 AM

Awesome looking job so far! Cabinet idea is a great idea, too

The PCB board in the last picture is your design? What will be electrically different with your version versus the original?

SY · 20th March 2010, 11:21 AM

I am delighted to see someone pay the proper attention to output tube ventilation. Nice work! Electrical details would indeed be interesting.

kavermei · 20th March 2010, 11:29 AM

I like those wooden sides, nice idea. Keep up the good work!

Wardsweb · 20th March 2010, 11:36 AM

Quote:

Originally Posted by Loren42

Awesome looking job so far! Cabinet idea is a great idea, too

The PCB board in the last picture is your design? What will be electrically different with your version versus the original?

The driver board is the brainchild of Shannon Park. This accounts for most of the real design changes. Most others have to do with different parts dealing with filtering or the ability to roll different tubes.

Here is a detailed page on this build: Wardsweb Dynaco ST-70 Project

Wardsweb · 26th March 2010, 02:36 AM

This is what all this turned into:

20th March 2010, 10:43 AM	#1
Wardsweb diyAudio Member Join Date: Feb 2003 Location: San Antonio, Texas	My take on a modern ST-70 Something a little different this time. Take a classic design Dynaco ST-70 and bring it up todate with some circuit changes and better parts. Then, throw in a totally new chassis and cabinet. The layout begins on some aluminum sheet.

20th March 2010, 11:21 AM	#7
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	I am delighted to see someone pay the proper attention to output tube ventilation. Nice work! Electrical details would indeed be interesting. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

20th March 2010, 11:29 AM	#8
kavermei diyAudio Member Join Date: Jan 2005 Location: Lokeren, Belgium	I like those wooden sides, nice idea. Keep up the good work! __________________ Never send a human to do a machine's job. --Agent Smith

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20th March 2010, 10:45 AM	#2
Wardsweb diyAudio Member Join Date: Feb 2003 Location: San Antonio, Texas	I drilled, cut and punched the chassis. Bend the back down for all the inputs and outputs. Then take it over to the local chrome shop for a bright finish.

20th March 2010, 10:47 AM	#3
Wardsweb diyAudio Member Join Date: Feb 2003 Location: San Antonio, Texas	I used Baltic birch to create a new cabinet design. The metal chassis slides in from the back.

20th March 2010, 10:49 AM	#4
Wardsweb diyAudio Member Join Date: Feb 2003 Location: San Antonio, Texas	Here is a picture from the back. The rectangle cutout is for the Corcom power module. The inputs are on the outside edges and the outputs are in the middle.

20th March 2010, 10:52 AM	#5
Wardsweb diyAudio Member Join Date: Feb 2003 Location: San Antonio, Texas	Now a lot of wiring to do. I spend a lot of time working on layout, wire runs and esthetics. It must only sound good, it has to look good too.

20th March 2010, 11:17 AM	#6
Loren42 diyAudio Member Join Date: Sep 2008 Location: "Space Coast" Florida, USA	Awesome looking job so far! Cabinet idea is a great idea, too The PCB board in the last picture is your design? What will be electrically different with your version versus the original?

26th March 2010, 02:36 AM	#10
Wardsweb diyAudio Member Join Date: Feb 2003 Location: San Antonio, Texas	This is what all this turned into:

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