Welborne Labs MINIAMP kit, any advice?

KevinLee · 16th July 2006, 03:27 AM

Hello,

I am considering building myself a simple line-stage around these boards to replace an op-amp based pre-amp.

They are based on an Erno Borbely design. Does anyone have any experience with these or any advice?

Would they be an improvement over my BB OPA627s that I am using now?

http://www.welbornelabs.com/miniamp.htm

Any input is appreciated.

Best Regards

KevinLee

LHMAudio · 17th July 2006, 07:15 PM

I built the tube hybrid from Welborne which is the same concept as the unit you are considering and is also based on a Borberly design. I've had a little problem with DC offset drift, but they sound fantastic. I have them direct coupled so I adjust the DC offset once per week. I have them mounted in a Mark Levinson JC2 preamp chassis along with a VSPS phono stage. The boards are very high quality and I had no problems with assembly. Ron Welborne also offers good technical support.

KevinLee · 17th July 2006, 07:47 PM

Thanks for the response,

I am glad to hear you are happy with the results.

I am still searching for a chassis to use, I will use the switching etc and replace the power supply and use the Welborne boards.

If anyone has a Rotel or Adcom pre-amp that is not working I would be interested in it.

Thanks

Kevinlee

LHMAudio · 17th July 2006, 08:10 PM

I ended up with four external supplies in two Hammond cases, all from Welborne. I use separate supplies for each channel, which results in two filament supplies and two circuit supplies. Channel separation is phenominal. The Levinson chassis already had two XLR connectors, so I simply replaced those with the proper ones for connecting the power supplies - no drilling. Using the existing selector and wiring saved a lot of time. I replaced the potentiometer as the wirewound pot that came with the Levinson was noisy.

Good luck and enjoy!

recca · 12th March 2007, 05:34 AM

Kevin

Did you actually put the Miniamp together? I'm thinking about building this too. It looks pretty simple to put together especially since I probably won't use a selector and use it strictly as a volume control.

Any thoughts would be appreciated.

Thanks!

Dave

16th July 2006, 03:27 AM	#1
KevinLee diyAudio Member Join Date: Oct 2002 Location: Winnipeg MB Canada	Welborne Labs MINIAMP kit, any advice? Hello, I am considering building myself a simple line-stage around these boards to replace an op-amp based pre-amp. They are based on an Erno Borbely design. Does anyone have any experience with these or any advice? Would they be an improvement over my BB OPA627s that I am using now? http://www.welbornelabs.com/miniamp.htm Any input is appreciated. Best Regards KevinLee

17th July 2006, 07:15 PM	#2
LHMAudio diyAudio Member Join Date: Sep 2005	I Built the Tube Hybrid Which Is Similar I built the tube hybrid from Welborne which is the same concept as the unit you are considering and is also based on a Borberly design. I've had a little problem with DC offset drift, but they sound fantastic. I have them direct coupled so I adjust the DC offset once per week. I have them mounted in a Mark Levinson JC2 preamp chassis along with a VSPS phono stage. The boards are very high quality and I had no problems with assembly. Ron Welborne also offers good technical support.

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17th July 2006, 07:47 PM	#3
KevinLee diyAudio Member Join Date: Oct 2002 Location: Winnipeg MB Canada	Thanks for the response, I am glad to hear you are happy with the results. I am still searching for a chassis to use, I will use the switching etc and replace the power supply and use the Welborne boards. If anyone has a Rotel or Adcom pre-amp that is not working I would be interested in it. Thanks Kevinlee

17th July 2006, 08:10 PM	#4
LHMAudio diyAudio Member Join Date: Sep 2005	I ended up with four external supplies in two Hammond cases, all from Welborne. I use separate supplies for each channel, which results in two filament supplies and two circuit supplies. Channel separation is phenominal. The Levinson chassis already had two XLR connectors, so I simply replaced those with the proper ones for connecting the power supplies - no drilling. Using the existing selector and wiring saved a lot of time. I replaced the potentiometer as the wirewound pot that came with the Levinson was noisy. Good luck and enjoy!

12th March 2007, 05:34 AM	#5
recca diyAudio Member Join Date: Jun 2005 Location: San Francisco	Kevin Did you actually put the Miniamp together? I'm thinking about building this too. It looks pretty simple to put together especially since I probably won't use a selector and use it strictly as a volume control. Any thoughts would be appreciated. Thanks! Dave

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