New ST-70 Driver board from Blackburn Audio

Original Burnedfingers · 26th June 2008, 12:46 PM

Just saw a reference to a new driver board by Blackburn Audio in Chicago. The board uses a cascoded 6sn7 and a 6sn7 phase inverter.
I saw this information on diytube. The board sells for $39.95 plus shipping. I ordered one just for the heck of it.

Pyre · 26th June 2008, 01:22 PM

I am going to give one a try as well.

Are you going to put it on a ST-70 or custom amp? I am going to try it on a regular ST-70 but with a extra transformer for the filaments.

Original Burnedfingers · 26th June 2008, 01:27 PM

I am going to use it on a custom amplifier that I am gathering parts for. It might be a chance to use some CCS boards also

Pyre · 26th June 2008, 01:33 PM

What output tubes are you planning on using? Are a set of 6SN7's enough to drive anything bigger then a EL34? I know the Mapletree driver board used 6LS7's.

Original Burnedfingers · 26th June 2008, 01:39 PM

I am using 6BG6GA's in my Dynaco and I enjoy them very much so I am going to try them in the amplifier that I am going to build. I think this driver board will drive them.

Pyre · 26th June 2008, 02:03 PM

I just installed one of the new design Triode Electronic driver boards with the EF-86's last week. With a few mods it can drive just about anything.

I wish I would have seen this board before I ordered as I have lots of 6SN7's and no spare EF86's

One of the EF86's came DOA and there is nothing more disappointing then building something and having it not work. Of course I checked my wiring 4 times before moving tubes around and figuring it out. I got some EF86 locally and it works fine now.

I hope the Blackburn board works well as it would be great to have a octal option for the ST-70.

Original Burnedfingers · 26th June 2008, 03:40 PM

The Mapletree is another octal option for the Stereo 70. It is a good sounding driver board.

Pyre · 26th June 2008, 03:47 PM

well its an option for someone with $300

Its a fine looking board and they are about 2 miles from me down the road but $300 would buy me another St-70

Original Burnedfingers · 26th June 2008, 04:17 PM

Yes, an expensive driver board but I have recently purchased the parts to put together several of my own. I bought the turrets and turret tool as well. Mine will have a stainless steel polished and grained top plate unstead of the 18ga painted one that comes with the package. I may do up this design in a hand wired version. I would like to try 6SL7's in both spots I think.

Pyre · 26th June 2008, 04:46 PM

I too printed off the schematic with the intentions of wiring up my own version but when I went to buy the resistors I had trouble locating the correct values. I generally only buy PRP resistors as they say the value on them. I am colour blind therefore can not read resistor bands and my girlfriend gets really tired of me asking her what value a resistor is.

Are you planning on selling any of your version?

I have some really nice NOS 6/12SL7's that I bought to build a phono stage.

26th June 2008, 12:46 PM	#1
Original Burnedfingers diyAudio Member Join Date: Nov 2002	New ST-70 Driver board from Blackburn Audio Just saw a reference to a new driver board by Blackburn Audio in Chicago. The board uses a cascoded 6sn7 and a 6sn7 phase inverter. I saw this information on diytube. The board sells for $39.95 plus shipping. I ordered one just for the heck of it.

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26th June 2008, 01:22 PM	#2
Pyre diyAudio Member Join Date: May 2006	I am going to give one a try as well. Are you going to put it on a ST-70 or custom amp? I am going to try it on a regular ST-70 but with a extra transformer for the filaments.

26th June 2008, 01:27 PM	#3
Original Burnedfingers diyAudio Member Join Date: Nov 2002	I am going to use it on a custom amplifier that I am gathering parts for. It might be a chance to use some CCS boards also

26th June 2008, 01:33 PM	#4
Pyre diyAudio Member Join Date: May 2006	What output tubes are you planning on using? Are a set of 6SN7's enough to drive anything bigger then a EL34? I know the Mapletree driver board used 6LS7's.

26th June 2008, 01:39 PM	#5
Original Burnedfingers diyAudio Member Join Date: Nov 2002	I am using 6BG6GA's in my Dynaco and I enjoy them very much so I am going to try them in the amplifier that I am going to build. I think this driver board will drive them.

26th June 2008, 02:03 PM	#6
Pyre diyAudio Member Join Date: May 2006	I just installed one of the new design Triode Electronic driver boards with the EF-86's last week. With a few mods it can drive just about anything. I wish I would have seen this board before I ordered as I have lots of 6SN7's and no spare EF86's One of the EF86's came DOA and there is nothing more disappointing then building something and having it not work. Of course I checked my wiring 4 times before moving tubes around and figuring it out. I got some EF86 locally and it works fine now. I hope the Blackburn board works well as it would be great to have a octal option for the ST-70.

26th June 2008, 03:40 PM	#7
Original Burnedfingers diyAudio Member Join Date: Nov 2002	The Mapletree is another octal option for the Stereo 70. It is a good sounding driver board.

26th June 2008, 03:47 PM	#8
Pyre diyAudio Member Join Date: May 2006	well its an option for someone with $300 Its a fine looking board and they are about 2 miles from me down the road but $300 would buy me another St-70

26th June 2008, 04:17 PM	#9
Original Burnedfingers diyAudio Member Join Date: Nov 2002	Yes, an expensive driver board but I have recently purchased the parts to put together several of my own. I bought the turrets and turret tool as well. Mine will have a stainless steel polished and grained top plate unstead of the 18ga painted one that comes with the package. I may do up this design in a hand wired version. I would like to try 6SL7's in both spots I think.

26th June 2008, 04:46 PM	#10
Pyre diyAudio Member Join Date: May 2006	I too printed off the schematic with the intentions of wiring up my own version but when I went to buy the resistors I had trouble locating the correct values. I generally only buy PRP resistors as they say the value on them. I am colour blind therefore can not read resistor bands and my girlfriend gets really tired of me asking her what value a resistor is. Are you planning on selling any of your version? I have some really nice NOS 6/12SL7's that I bought to build a phono stage.

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