Gold plated Dynaco ST-70 for $3k

audiohead · 2nd February 2013, 05:51 AM

check this out:

Dynaco Stereo 70 Gold Edition Tube Amp 24K Gold Plated Fully Restored ST70 | eBay

with original selenium bias rectifier.

Art

Loren42 · 2nd February 2013, 12:20 PM

I don't like the blue wire. If it was another color, that would be different.

analog_sa · 2nd February 2013, 01:19 PM

Quote:

Originally Posted by audiohead

Art

The shipping @$1,158.73 is not less artful.

roline · 2nd February 2013, 01:25 PM

$3k eye candy, still will sound like a $400 amp...

TheGimp · 2nd February 2013, 01:50 PM

With $400 of plating and silkscreen.

20to20 · 2nd February 2013, 05:40 PM

He blew the value of that project with the unnecessary circuit mods.

Beautiful amp though.

TubeHead Johnny · 3rd February 2013, 01:32 AM

So why $3000? The vintage electronics market is ridiculous! I hate eBay.

TheGimp · 3rd February 2013, 03:07 AM

No mention of compensation for the higher B+ due to (1) higher ac line voltage today, (2) removal of the 5AR4 rectifier heater load, and (2) the fact that he removed the valve rectifier and replaced it with SS rectifiers which have lower voltage drop.

I've not been a fan of Sprague Atom capacitors. The quality just hasn't been there in the past 20 years, but that is personal preference. In the 70s and 80s I would have recommended them.

12B4A · 3rd February 2013, 03:33 AM

Removing that rectifier tube function but leaving the heater connected was a master stroke of tackiness.

HollowState · 3rd February 2013, 03:59 AM

Quote:

Originally Posted by 12B4A

Removing that rectifier tube function but leaving the heater connected was a master stroke of tackiness.

If you study the picture of the wiring very closely, it lools to me like the rectifier tube is still connected (both plates & filament) and the SS diodes are in parallel with the tube. You can just see the blue wires on pins 4 & 6. Make your own decisions about the quality of that type of work.

2nd February 2013, 05:51 AM	#1
audiohead diyAudio Member Join Date: Mar 2005 Location: Los Angeles, california	Gold plated Dynaco ST-70 for $3k check this out: Dynaco Stereo 70 Gold Edition Tube Amp 24K Gold Plated Fully Restored ST70 \| eBay with original selenium bias rectifier. Art

2nd February 2013, 01:25 PM	#4
roline diyAudio Member Join Date: Sep 2010 Location: East Tennessee	$3k eye candy, still will sound like a $400 amp... __________________ SO many tubes, SO little time!!!

3rd February 2013, 01:32 AM	#7
TubeHead Johnny diyAudio Member Join Date: Jan 2005 Location: The emerald city, Seattle, WA.	So why $3000? The vintage electronics market is ridiculous! I hate eBay. __________________ "No man really becomes a fool until he stops asking questions" - Charles Proteus Steinmetz

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
preamp suitable for Dynaco st-70- OTHER than dynaco	namatjira	Tubes / Valves	3	22nd December 2011 01:21 AM
Dynaco ST-70 chassis	rsumperl	Tubes / Valves	2	2nd July 2011 11:55 AM
dynaco st 70 c3	dcb50	Tubes / Valves	9	8th December 2008 09:58 PM
Motorboating in Dynaco ST-70	neddyboy	Tubes / Valves	10	2nd July 2007 02:38 AM
Dynaco st-70	toenail	Tubes / Valves	9	19th April 2003 11:08 AM


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

2nd February 2013, 12:20 PM	#2
Loren42 diyAudio Member Join Date: Sep 2008 Location: "Space Coast" Florida, USA	I don't like the blue wire. If it was another color, that would be different.

2nd February 2013, 01:50 PM	#5
TheGimp diyAudio Member Join Date: Aug 2009 Location: Johnson City, TN	With $400 of plating and silkscreen.

2nd February 2013, 05:40 PM	#6
20to20 diyAudio Member Join Date: Jun 2010 Location: W-S, NC	He blew the value of that project with the unnecessary circuit mods. Beautiful amp though.

3rd February 2013, 03:07 AM	#8
TheGimp diyAudio Member Join Date: Aug 2009 Location: Johnson City, TN	No mention of compensation for the higher B+ due to (1) higher ac line voltage today, (2) removal of the 5AR4 rectifier heater load, and (2) the fact that he removed the valve rectifier and replaced it with SS rectifiers which have lower voltage drop. I've not been a fan of Sprague Atom capacitors. The quality just hasn't been there in the past 20 years, but that is personal preference. In the 70s and 80s I would have recommended them.

3rd February 2013, 03:33 AM	#9
12B4A diyAudio Member Join Date: Aug 2012 Location: Right here, on this screen	Removing that rectifier tube function but leaving the heater connected was a master stroke of tackiness.

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read